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prof.arc ...
Joined: 26 Jan 2003 Posts: 703
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Posted: Wed Jan 21, 2004 1:31 am Post subject: more on Bam & quality of Concrete |
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1. New Constructions. Ideally it looks as though if we follow the code in new constructions, the problem will vanish. However good we may be in theoretical analysis and design, in practice unless we minimise eccentricity and torsion, there will be damages in new constuctions. There is no substitute for regularly planned buildings [irregular buildings have a higher risk even if properly analysed and designed] Even more important is proper detailing and concreting in the field conditions. I did not realise it when I was in the rarified academic atmosphere and taking for granted that field work will be nearly simulating lab conditions. Now, I have a hobby to see construction sites as a common man without disclosing my identity and observe the abuse. My samples indicate the problem is serious. In this cycle of Builder-Architect-Analysit/Designer-Field Engineer /Mistry and the eventual owner of the flat, the most important thing is to educate them the obvious - there is no substitute for a well confined reinforced concrete without honey-combing. 2. Old Constructions: We cannot wish away the problems. Even the code is silent after it upgrades the forces about those structures constructed earlier strictly following the codes in existance at the time of their construction. 3. Do not spread the resources thin !! It is good to identify those cities in Zone V [Northeast India and Himachal Pradesh, assuming 1897 & 1905 will revisit] and concentrate on new as well as old constructions. Pray freaks like Khillari, etc ., do not resurface elsewhere and do not waste resources in zone III and below. In my opinion, even Delhi has a lower priority as compared to Gauhati and Kangra ! 4. Campaign aggressively campaign for regularly shaped buildings and good construction in the field to ensure integral joints.
ARC ----- Original Message ----- From: <ABHYANKAR@hccindia.co.in> To: <prof.arc@gmail.com> Sent: Sunday, January 18, 2004 8:37 PM Subject: Different Grades of Concrete - - - From Constrcution Point Of Vie w
Quote: | Dear All Structural Engineers & Mr. Vijaya Vittal
From "Designers Point of View" one may not mind in using lower grade concrete (as that of the beam) in beam-column junction. But if we talk
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Quote: | actual site condition, we all know that the beam-column junction is
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Quote: | reinforced portion. Hence always many contractors do not pour & compact concrete, nicely, in this zone.
Also in olden days the joints were neglected, but now a days the Design-Standards give more importance to the design of joints.
Hence the obvious decision that has to be taken by the Designer, to use HIGHER GRADE of concrete ONLY, in beam-column junction.
Regards Vivek Abhyankar (HCC-Design Dept)
Note : Even if we go for very sophisticated analysis of a structure, using modern computer software, all these efforts will be wasteful, unless, the contractor is made to implement them on site. |
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