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B.V.Harsoda General Sponsor
Joined: 19 Jan 2009 Posts: 2329 Location: RAJKOT,GUJARAT, INDIA
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mjnasar ...
Joined: 26 Jan 2003 Posts: 72
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Posted: Thu Sep 10, 2020 8:45 am Post subject: Re: Reinforcement detailing of Joint |
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Dear Eng.Abhishek Kumar
i suppose we provide length of bar at joints for
Development length
- the stress in the the bars should transfer to surrounding concrete
and the stress should be in the certain limit
If as per fig.7 & 8
all the bars are looped closed
means the transfer of stress are in the small area of concrete
and might be concrete will crush
and need very sensitive FEM analysis to ascertain the stress levels
And these type of connections are not seen in my practice
regards
abhishek_kumar wrote: | Dear Seniors & fellow Sefian's,
PFA the document on reinforcement detailing of Beam Column joint.
In this paper, the conventional practices of curtailment of bars shown in Fig.5 & 6 . But curtailment of bars shown in Fig.7 & 8 are endorsed due to better performance and less congestion.
My Query is,
A.Can we use Fig 7 & 8 detailing for:-
1. Joints in RC Shear walls.
2. Joints in Walls of Rectangular Water Tanks.
B. Does anyone seen Detailing as Fig.7 & 8 in practice? Is it really advantageous?
Thanks & Regards
Abhishek kumar |
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VPandya General Sponsor
Joined: 09 Nov 2009 Posts: 842
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Posted: Wed Nov 18, 2020 4:33 am Post subject: NEW ACI DEATAILING MANUAL |
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Dear Sefi Friends ,
Now we have new ACI Detailing Manual :
MNL-66(20): ACI Detailing Manual :
DESCRIPTION
The 2020 edition of the ACI Detailing Manual, MNL-66, provides answers to many detailing questions asked by design engineers, architects, contractors, detailers, and engineering students. The Manual is divided in three sections: Section 1 includes a copy of ACI 315R-18, Guide to Presenting Reinforcing Steel Design Details; Section 2 includes individual details with corresponding checklists; and Section 3 includes a compilation of Concrete International articles chosen for their relevance to detailing reinforced concrete. Appendix A has tables to help the engineer in the detailing effort.
Section 1 guides designers of concrete structures in determining information and design details that are required to prepare reinforcing steel fabrication and placing drawings. The guide stresses the importance of this information to ensure that the reinforcing steel detailer effectively and accurately captures the intent of the designer, presenting it in a manner that is clear and unambiguous to the reinforcing steel fabricator and placer.
Section 2 illustrates methods for presenting necessary design information through over 100 individual details that provide examples of ways to communicate design information effectively and completely to the contractor. The details conform to “Building Code Requirements for Structural Concrete (ACI 318-19)” and were prepared with the assistance of a task group consisting of detailers, contractors, and practicing engineers. Each detail is placed on one page with dimensions and bar sizes left to be completed by the user. Alongside each detail, notes to the user are listed as a reminder of the main code requirements that need to be satisfied for that particular detail. This section is planned to be interactive with the engineering community. It is anticipated that engineers, architects, contractors, and detailers will not only submit comments to improve the details shown in this edition of the manual, but also submit other relevant details to be added to future editions at techinq@concrete.org.
Section 3 includes a collection of 37 articles published in Concrete International related to concrete detailing that were authored by detailers and practicing engineers. The articles identify constructability issues specific to reinforcing steel. Common problems found on engineering drawings are discussed along with solutions drawn from the experiences of knowledgeable practitioners in the industry. The article topics vary from describing the tolerance cloud to addressing constraints in reinforcing bar modeling to avoiding ambiguous callouts, among other topics. These solutions are not offered as official ACI-recommended practice.
Supporting reference data in Section 4 includes specific chapters on reinforcing bars, wires, bar supports, spirals, mathematical formulas and tables, and common symbols and abbreviations.
This guide is intended to provide examples and guidance for how licensed design professionals may satisfy the prescribed provisions of ACI 318-19, Building Code Requirements for Structural Concrete. It does not, however, purport to represent the only suitable way to satisfy the requirements for every project. Engineering judgment must be applied to the unique requirements of individual projects and the details should be modified accordingly before applying to a project.
New concrete detailing manual includes downloadable CAD files
American Concrete Institute document contains guidance on codes for structural concrete.
Importance of correct Concrete detailing can not be overstated , and being already highlighted in previous posts in SEFI .
Regards.
Vasudeo Pandya P.E.
Structural Engineer
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B.V.Harsoda General Sponsor
Joined: 19 Jan 2009 Posts: 2329 Location: RAJKOT,GUJARAT, INDIA
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Posted: Sat Aug 13, 2022 10:49 am Post subject: Aspect ratio of L,T, X, + and other sections |
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Dear All,
As per clause 7.1 of IS 13920:2016 for columns of shapes other than rectangular and circular (such as T, X and + shaped) which form part of the lateral load resisting system appropriate designs and detailing shall be carried out using specialist literature.
Clause 7.1.2 says that aspect ratio for column shall not be less than 0.4
Now question is that how to calculate aspect ratio of L,T, X, +
and other sections
I have try to calculate by indirect derivation, if I am wrong please correct me.
Aspect ratio of rectangular section =b/d
Mini. M. I. = 1/12 X d X b^3
Max. M. I. = 1/12 X b X d^3
b/d= [ (1/12 X d X b^3)/ (1/12 X b X d^3)]^0.5
= b/d
hence aspect ratio of any shape of column
= ( M.I. Mini./ M. I. Max)^0.5
Regards,
Er. B. V. Harsoda
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vikram.jeet General Sponsor
Joined: 26 Jan 2003 Posts: 3839
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Posted: Tue Aug 16, 2022 2:57 am Post subject: |
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Thank you Respected Harsoda saheb , the computations of aspect ratio is logical .
Hope for regular participation on sefi as you are one of few purists of Structural engg on Forum and budding engineers can gain from yr posts , as well veterans like me.
Thanks and regards
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B.V.Harsoda General Sponsor
Joined: 19 Jan 2009 Posts: 2329 Location: RAJKOT,GUJARAT, INDIA
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Posted: Fri Aug 19, 2022 10:45 am Post subject: |
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Thank you Respected Vikram Jeet Sir for response and appreciation
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