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Earthquake Engineering News & Events Structural Engneering

Session 11 : Amendment no. 2 for IS 1893 (Part 1) : 2016 & IS 13920 : 2016

Recently, BIS published the amendments related to IS 1893 (Part 1) : 2016 & IS 13920 in November, 2020. The article shows some of the major changes made in the code as per my understanding. Only brief details are mentioned below, for details please refer the amendments.

Amendment no. 2 of IS 1893 (Part 1) : 2016

1.     Clause related to vertical earthquake shaking is modified. The requirements are added for embankments, dams, bridges, etc. Also, the criteria for consideration of vertical earthquake shaking are modified. 

2.     The methodology for calculation of torsional irregularity is updated. The maximum displacement should be checked against the average displacement as against the minimum displacement in the previous version of the code. For more details, please refer the amendment.

 3.     For a building with re-entrant corners, three dimensional dynamic analysis to be performed with the flexible floor diaphragm. If there is a rigid diaphragm in the building then two separate analysis to be performed, firstly with flexible diaphragm and secondly with the rigid diaphragm. The worst effects to be considered from both the analysis.

 4.     For out of plane offset in vertical elements, the forces and moments due to earthquake effects in the elements connecting the two vertical elements with out of plane offset elements, the vertical element supporting the offset, and connections shall be enhanced by a factor of at least 2.5.

 5.     The provisions for stiffness irregularity are further clarified and few changes are made as well. In the note, it is mentioned that this provision is not applicable to such storeys, which have: (a) lower height, where services and utilities are housed, or (b) outrigger frame members placed in them.

 6.     For weak storey irregularity – buildings with strength irregularity shall not be permitted. In case, the weak storey is because of URM infills, provisions of 7.10 shall be followed.

 7.     Floating columns – Such columns are likely to cause concentrated damage in the structure, and are undesirable. A building with floating columns shall not be permitted, if the floating columns are part of or supporting the primary lateral load resisting system.’

 8.     Irregularity related to “Irregular Modes of Oscillation in Two Principal Plan Directions” is further clarified. It is also mentioned that this provision is not applicable to buildings with large podiums in the lower storeys.

 9.     For importance factor, “school” is replaced with the “educational building”.

 10.  OBF is not allowed in seismic zone III, IV & V.

 11.  Provisions for flat slab – structural wall system are further clarified.

 12.  Formula for Aw is modified and now it is same as when the code was published in 2016. It is mentioned that The value of Ta obtained shall neither be taken to be more than that given in 7.6.2 (a) nor less than that given in 7.6.2 (c).

 13.  In case of URM, RC members shall be designed for the governing combinations of stress resultants arising from structural analysis of:

a) Bare frame building, and

b) Frame building with URM infills.

14. For other details, please refer the amendment.

 Amendment no. 2 of IS 13920 : 2016

1.    Steel reinforcement shall comply with all of the following:

a) Elongation shall be at least 14.5 percent,

b) Ratio of ultimate stress to 0.2 percent proof stress shall not exceed 1.25,

c) Ratio of ultimate stress to 0.2 percent proof stress shall be at least 1.15, and

d) Steel shall be only of strength grades with minimum 0.2 percent proof stress of 415 MPa, 500 MPa or 550 MPa, in addition to other requirements of IS 1786.’

 2.     In cl no. 9.1.1, modifications are made for calculation of nominal shear strength of concrete in a beam-column joint.  

3.     In cl no. 9.1.2, provisions related to design shear stress demand are further clarified.

4. For other details, please refer the amendment. 

We are planning live technical discussion for the amendments on 20-DEC-20 at 11:00AM IST. Please share your comments / discussion points in the below comment box. We will discuss the same during live session of 20-DEC-20.

Link of the live session is attached below. Please like and share this video with the interested engineers in your circle.

Session 11 : Recent amendments for IS 1893 (Part 1):2016 and IS 13920:2016 – Live discussion

An online course related to earthquake resistant design will start from 17-MAR-22. Please watch the introductory video below:

EQ-STR-002 : Learn concepts of earthquake resistant design

Click below for more details and registration for EQ-STR-002

LEARN MORE
Categories
News & Events Quality Assurance Structural Engneering

Importance of Quality Assurance in Structural Engineering Firm

Thank you all for participation in the live session for “Importance of Quality Assurance in structural engineering firm” and for raising important discussion points. Bhavin Shah (Founder & CEO, SQVe Consultants) had conducted the session.

The link of video is shared below, in case you have missed out the live session.

Your further views/comments are welcome on the subject.

Categories
News & Events Quality Assurance Structural Engneering

Session 10 – Importance of Quality Assurance in Structural Engineering Firms

Join us for Live Discussion on 13-DEC-20 at 11:00am IST for “Importance of Quality Assurance in Structural Engineering firms”.

Quality assurance is one of the extremely important area for the design engineering consultancy firms. The Quality Assurance covers the broader aspects like compliances to the prevailing regulatory standards, meeting functional & aesthetics requirements, ensuring strength and stability of structures, effective interface to avoid rework at site, generating error free design documents, inclusion of sustainability, safety, constructability aspects, etc.Please tag the engineers in your circle who may be interested in the topic. Also, pl share your discussion points in the below comment box. We will take up the same during the live session.

Session 10 : Importance of Quality Assurance in Structural Engineering Firms
Categories
Geotechnical Engineering News & Events Online Courses Structural Engneering

First Facebook Live session of SQVe Consultants : Importance of interface between Geotechnical and Structural engineers

We had an interesting conversation on the subject : Importance of interface between Geotechnical & Structural Engineers. Your further comments / queries on the subject are invited.

For safety of the structure and cost optimisation, appropriate geotechnical investigation is extremely important. Apart from definite statistics, it can be said that the geotechnical failures are one of the major causes for collapse of the structures. In the typical fast track projects, sometimes proper interface is not carried out between geotechnical engineer and structural engineer which may affect adversely the major goals of engineering, i.e. safety of the structure and cost optimisation. Also, the project may get delayed substantially due to inappropriate soil investigation or may be due to lack of interface between geotechnical engineer and structural engineer.

VIVEK KUMAR MITRA is a renowned consultant in Geotechnical Engineering. He commenced his career as a GEOTECHNICAL ENGINEER at TATA Consulting Engineers Limited, Mumbai. Later he moved to organization like Bureau Veritas, Reliance, Impac, Egis Consulting Engineers. He was at Abu Dhabi for mega artificial Island Project in 2013 and represented ADNOC. He is geotechnical consultant for projects at Saudi Arabia, Kuwait, and Dubai.He has worked in projects in the areas of Offshore, Infrastructure, Power, Refinery, Petrochemicals & Marine. He also handled with distinction various projects in Ports & Harbors, Mega-Infrastructure, Artificial Islands, Dredging / Land Reclamation and Oil & Gas, Ground Improvement for ultra-soft soil. He is the Founder & CEO of VKM GEOTECHNICS which he started in 2019.

ABOUT THE FACILITATOR

Mr. Bhavin Shah is passionate about Engineering profession with two decades of experience. He is having a dream for enhancing the engineering profession in different organisations. He completed graduation in Civil Engineering and Masters in Structures from Sardar Patel University. He is having unique experience of working in the specialized firm of civil / structural consultancy which grew as multidisciplinary firm (VMS), large multidisciplinary firm (L&T Chiyoda Ltd.) and owner based engineering set up (Adani Infra (I) Ltd.). He worked in different organisations at different levels, starting from junior design engineer to CEO. He is Founder & CEO of SQVe Consultants.

Link for registration and payment for the online course GEO-STR-001 : https://sqveconsultants.com/2020/10/14/online-course-process-of-interactive-geotechnical-investigation/

Categories
Geotechnical Engineering News & Events Structural Engneering

Session no. 9 – Discussion about our upcoming online course GEO-STR-001 : Live Technical Discussion

Session 9 - Discussion about our upcoming online course GEO-STR-001 : Live Technical Discussion
Session 9 - Discussion about our upcoming online course GEO-STR-001 : Live Technical Discussion

We are glad to announce our first online course in the important area of interface between geotechnical and structural engineering. The course title is “GEO-STR-001 : Process of Interactive Geotechnical Investigation”.

For safety of the structure and cost optimisation, appropriate geotechnical investigation is extremely important. In the typical fast track projects, sometimes proper interface is not carried out between geotechnical engineer and structural engineer which may affect adversely the major goals of engineering, i.e. safety of the structure and cost optimisation. Also, the project may get delayed substantially due to inappropriate soil investigation.

The course is designed carefully to address the practical aspects so that the details can be readily used in the real projects. We are thankful of Vivek Kumar MITRA for his efforts in designing the unique course.

We are pleased to mention that it created a lot of excitement in the prospective participants. We have received numerous suggestions/questions from social media regarding the content and structure of the course. Part of the same will be covered in this course and we will attempt to cover the balance details in the future courses.

In next live technical discussion on 8-Nov-20, we are going to focus our discussion on the upcoming online course. The agenda of the session will be as follows:

  • To give overall introduction about content and structure of the course
  • Brief discussion about the interesting questions (around 35 nos.) received from social media
  • Collating the further important suggestions/questions received from the participants through live chat
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Link for participating in all live technical discussions (EVERY SUNDAY at 11:00am IST):
https://youtube.com/c/StructuralEngineering/Live

Registration for the course is open. For more details and registration, please refer the following link:

https://sqveconsultants.com/2020/10/14/online-course-process-of-interactive-geotechnical-investigation/

Looking forward for your participation in the session of 8-NOV-20. You may also share the input in the below comment box.

Session 9 – Discussion about our upcoming online course GEO-STR-001 : Live Technical Discussion

Facilitator : Bhavin Shah (Founder & CEO, SQVe Consultants)

Categories
News & Events Structural Engneering

Session 8 : Wind force estimation for tall structures as per IS 875-Part 3

Session no. 8 : Wind force estimation for tall structures as per IS 875-Part 3
Session no. 8 : Wind force estimation for tall structures as per IS 875-Part 3

As a part of weekly live technical discussion series, we had very interactive session for estimation of wind force for low rise structures. In the session of 1-Nov-20, we will focus our discussion on Tall buildings.

Wind forces & associated response of Tall buildings is much important not only for design of building but also from the point of view of acceleration & human comfort, surrounding wind flow pattern changes, glazings & facade design, pedestrian level comfort etc. Dynamic response evaluation is critical & particularly across wind response for tall slender buildings. Interference among buildings when they exist in a cluster are still not fully well understood and documented. Hence, our session on 1st November will be dedicated to Tall buildings.

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Er. Dr. Abhay Gupta will join with us in the live stream as a guest expert. He has obtained his BE(Civil) in 1981 & subsequently ME(Structures) from SGSITS Indore; and Ph.D. from University of Roorkee, Roorkee (now IIT Roorkee) in the area of “Aerodynamic Interference in Tall Rectangular Buildings: Wind Tunnel Studies” in 1996. He has more than 35 years of experience in the field of Civil Engineering construction and Structural design. Dr. Abhay Gupta is one of the Directors of Skeleton Consultants Pvt. Ltd. Noida. Dr. Gupta has also worked as Principal consultant for establishment of Wind tunnel facility at Guna MP.

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TONY ROFAIL – DIRECTOR, WINDTECH

Mr. Tony Rofail will also join the live stream as a guest expert. Tony has been the principal consultant at Windtech since 1991 where he has carried out or supervised wind engineering services for over 2,500 major projects around the world, including numerous landmark projects. This includes the study of structural wind loads and cladding pressures on large structures, wind environment and air quality studies, wind-noise, natural ventilation design and modelling, sustainable design as well as product development for aerodynamic performance. 

Facilitator : Bhavin Shah, Founder & CEO – SQVe Consultants

Session no. 8 : Wind force estimation for tall structures as per IS 875-Part 3
Our all live sessions are streamed at the following link (Every Sunday at 11:00am IST) :
https://youtube.com/c/StructuralEngineering/Live

In the comment box, please share your questions / areas which you would like to get covered in the session pertaining to tall buildings.

Categories
News & Events Structural Engneering

Session no. 7 : Irregularities as per Table no. 5 & 6 of IS 1893 (Part 1) : 2016

I have received suggestions from engineers to take up the discussion on irregularities as per table no. 5 &6 of IS 1893 (Part 1) : 2016.

It is a well established fact that the regular building perform better than the irregular buildings during seismic event. In IS 1893 (Part 1) : 2016, plan and vertical irregularities are defined in Table no. 5 & 6 of the code. The building is said to be irregular if any one of the irregularity is present in the building. It is mentioned in the code that all the efforts shall be made to eliminate irregularities by modifying architectural planning and structural configurations.

For each irregularity, mathematical limits are defined in the code as well as further action is detailed out whenever the irregularity exceeds the defined limits.        

Table no. 5 – Plan irregularities :

  • Torsional irregularity
  • Re-entrant corners
  • Floor slabs having excessive cut-outs or opening
  • Out-of-plane offsets in vertical elements
  • Non-parallel lateral force system

Table no. 6 – Vertical irregularities :

  1. Stiffness irregularity (Soft storey)
  2. Mass irregularity
  3. Vertical geometric irregularity
  4. In-plane discontinuity in Vertical elements resisting lateral force
  5. Strength irregularity (Weak storey)
  6. Floating or stub columns
  7. Irregular modes of oscillation in two principal plan directions

We will discuss each irregularity in detail during live technical discussion. The participants will also share their experiences related to the table no. 5 & 6 of the code. 

You may share the specific queries / discussion point which may be taken up during live technical discussion.

Join us on next Sunday (25-Oct-20) for live technical discussion on different irregularities as per table no. 5 and 6 of IS 1893 (Part 1) : 2016. Please share discussion points for the same in the comment box. You may also circulate this message with the interested engineers in your circle.

Session no. 7 – Irregularities as per Table no. 5 & 6 of IS 1893 (Part 1) : 2016
Facilitator : Bhavin Shah, Founder & CEO – SQVe Consultants

Categories
News & Events Structural Engneering Wind engineering

Session 6 – Wind force estimation for low rise structures as per IS 875 (Part 3) : 2015

Session 6 - Wind force estimation for low rise structures as per IS 875 (Part 3) : 2015
Session 6 - Wind force estimation for low rise structures as per IS 875 (Part 3) : 2015

Wind forces & pressures are important in the design of structures being frequently occurring phenomenon. The fundamental IS code related to wind forces (IS 875- Pt. 3) was revised in 2015 and two amendments have been so far issued. It generated few practical difficulties.

So, In the next session, we will focus our discussion on “Wind force estimation for low rise structures as per IS 875 (Pt. 3) : 2015”. Tall buildings & Wind tunnel testing will be covered in the future sessions. Er. Dr. ABHAY GUPTA will join with us in the live stream as a guest expert. He has obtained his BE(Civil) & subsequently ME(Structures) from SGSITS Indore; and Ph.D. from University of Roorkee (now IIT Roorkee) in the area of “Aerodynamic Interference in Tall Rectangular Buildings: Wind Tunnel Studies” in 1996. He has more than 35 years of experience in the field of Civil Engineering construction and Structural design. Dr. Abhay Gupta is one of the Directors of Skeleton Consultants Pvt. Ltd. Noida.

Please share your questions / areas which you would like to get covered in the session pertaining to wind engineering.

Session 6 – Wind force estimation for low rise structures as per IS 875 (Part 3) : 2015

SQVe Consultants has taken up the initiative for launching the “weekly live technical discussion” series for focusing on the areas wherein industry is facing practical difficulties. To know more about SQVe : https://sqveconsultants.com The topic will be decided in advance and the technical discussion will be conducted through the live stream at youtube. The sessions will be organized on every Sunday at 11:00am.

Facilitator : Bhavin Shah (Founder & CEO, SQVe Consultants)

Categories
Geotechnical Engineering Online Courses Structural Engneering

Online course – Process of Interactive Geotechnical Investigation

COURSE NO. : GEO-STR-001

BACKGROUND

For safety of the structure and cost optimisation, appropriate geotechnical investigation is extremely important. Apart from definite statistics, it can be said that the geotechnical failures are one of the major causes for collapse of the structures. In the typical fast track projects, sometimes proper interface is not carried out between geotechnical engineer and structural engineer which may affect adversely the major goals of engineering, i.e. safety of the structure and cost optimisation. Also, the project may get delayed substantially due to inappropriate soil investigation or may be due to lack of interface between geotechnical engineer and structural engineer.

What is unique about this course?

  • The course is designed by the experienced engineers (Vivek Kumar Mitra & Bhavin Shah) who have together more than four decades of experience in the field of geotechnical and structural engineering.
  • The entire course is designed from the practical aspects which can be readily used in the real projects.
  • The course is designed to have an interactive mode so that the problems / doubts of the participants can be addressed.
  • The course includes a tutorial wherein the participants will get hands on experience related to geotechnical engineering.  
  • Certificate will be issued on successful completion of the online course wherein the major areas covered in the course will be mentioned in the certificate.

Course Faculty

ABOUT THE SPEAKER

MR. VIVEK KUMAR MITRA is a renowned consultant in Geotechnical Engineering. He commenced his career as a GEOTECHNICAL ENGINEER at TATA Consulting Engineers Limited, Mumbai. Later he moved to organization like Bureau Veritas, Reliance, Impac, Egis Consulting Engineers. He was at Abu Dhabi for mega artificial Island Project in 2013 and represented ADNOC. He is geotechnical consultant for projects at Saudi Arabia, Kuwait, and Dubai.

He has worked in projects in the areas of Offshore, Infrastructure, Power, Refinery, Petrochemicals & Marine. He also handled with distinction various projects in Ports & Harbors, Mega-Infrastructure, Artificial Islands, Dredging / Land Reclamation and Oil & Gas, Ground Improvement for ultra-soft soil. He is the Founder & CEO of VKM GEOTECHNICS which he started in 2019.

ABOUT THE FACILITATOR

Mr. Bhavin Shah is passionate about Engineering profession with two decades of experience. He is having a dream for enhancing the engineering profession in different organisations. He completed graduation in Civil Engineering and Masters in Structures from Sardar Patel University. He is having unique experience of working in the specialized firm of civil / structural consultancy which grew as multidisciplinary firm (VMS), large multidisciplinary firm (L&T Chiyoda Ltd.) and owner based engineering set up (Adani Infra (I) Ltd.). He worked in different organisations at different levels, starting from junior design engineer to CEO. He is Founder & CEO of SQVe Consultants.

Methodology

  • The entire course is designed in the ONLINE mode.
  • The course will spread over  6 days with ~2 contact hours per day (total contact hours : 12)
  • During the course, the interaction can be done with faculty using customised discussion forum.
  • The sessions will be conducted using ZOOM software.
  • Tutorial will be given to the participants pertaining to practical questions.

Who should attend?

This course will be useful for following :

  • Experienced Civil and Structural Engineers
  •  Graduate in Civil Engineering
  •  Post Graduate in Geotechnical Engineering
  •  Post Graduate in Structural Engineering
  •  PhD in Civil engineering who want to enhance their geotechnical engineering capability.

No bar on experience limit for the participants. Anyone who has interest in interface between geotechnical and structural engineer can join this course.

Glimpses & Feedback of online course : GEO-STR-001 ( 1st BATCH )

Course starts from…

     The next batch of the course will commence from 22nd February, 2021. Kindly note that there are limited seats to ensure effective interaction with all the participants.

Book your seat now!

Brochure of the course along with the scheduleDownload
REGISTER NOW

Important : This payment gateway and fee is only for the Indian participants. Interested foreign participants are requested to contact us at below mentioned email address to know about fees and the payment procedure.

For any further queries or details, please write to us at onlinecourses@sqveconsultants.com

You may also join the telegram group for further discussion related to the course : https://t.me/geo_str_001

In the below comment box, you may share the areas / details which you would like to get covered in the course.

Categories
News & Events Structural Engneering

Time period for buildings with structural walls as per IS 1893 (Part 1):2016

I have received many queries related to time period calculations for buildings with shear wall in accordance with cl no. 7.6.2 of IS 1893 (Part 1) : 2016. Time period is very sensitive parameter with respect to earthquake resistant design. In the article, I have shared my understanding related to the clause for further comments/suggestions.

Background:

In the IS 1893 (Part 1):2016, empirical formula for calculation of time period is defined in cl no. 7.6.2. In the clause, formulae are defined for three different types of structural systems:

(only part details are shown in the below content. Please refer the code for complete details).

a)   Bare MRF buildings (without any masonry infills)

·     RC MRF buildings

·     RC-Steel composite MRF building

·     For steel MRF building

b)  Buildings with RC structural walls

c)   All other buildings

For buildings with RC structural walls, the following formula was included in the code when it was published:

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Wherein Aw can be calculated using the following formula,

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Thereafter, the amendment no. 1 was released in 2017 and in the amendment, the above mentioned formula for Aw was updated as under:

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Opinion of the engineers : 

I believe that the majority of engineers are of the opinion that the earlier formula which was mentioned in IS 1893 (Part 1):2016 was correct and there is error in the revised formula (amendment no. 1). 

My observations on the formula for time period:

1)  In case of open storey, as per cl no. 7.10.4 of the code, when the RC structural walls are provided, the RC structural wall plan density of the building shall be at least 2 percent along each principal direction in seismic zones III, IV and V. RC structural walls of this measure can be adopted even in regular buildings that do not have open storey(s).

  2)  As per cl. no. 7.6.2, the time period for buildings with structural walls need not be less than 0.09*h/SQRT (d). Based on few worked out examples, I observed that the time period derived from earlier Aw formula of the code along with 2% of shear wall in each principal direction was generally near to 0.09*h/SQRT (d).

However, with the amendment formula of Aw, the time period considering 2% of shear wall, was significantly higher than the time period which is derived from 0.09*h/SQRT (d).

With this anomaly, I believe that the majority of engineers are of the opinion that the earlier formula of Aw was appropriate.

3)  In my opinion, the structures with RC structural walls (shear walls) will be the most rigid one as compared to the Bare MRF buildings and the other buildings, as defined in cl no. 7.6.2. I think the upper limit of time period for buildings with RC structural walls may be defined as 0.09*h/SQRT (d). The upper cap limit may be defined or altered for range of height of the building.

4)  I think that the more examples may be worked out for checking appropriateness of the above mentioned formulas. 

Live Technical Discussion on next Sunday ( 11-Oct-20 at 11:00am):

SQVe Consultants have taken up the initiative for launching the “weekly live technical discussion” series for focusing on the areas wherein industry is facing practical difficulties. To know more about SQVe : https://sqveconsultants.com The topic will be decided in advance and the technical discussion will be conducted through the live stream at youtube. The sessions will be organized on every Sunday at 11:00am. Facilitator : Bhavin Shah (Founder & CEO, SQVe Consultants)

During next live technical discussion, we will take up this interesting area for discussion. Please join us in the live session.

Time period for Buildings with structural walls as per IS 1893(Part 1) : 2016

I have shared my views on the subject. Your valuable comments/suggestions are welcome for further improvement in this article. The suggested points may be taken up during the live technical discussion of 11-Oct-20 at 11:00am.

Bhavin Shah

Founder & CEO, SQVe Consultants