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Progressive Collapse Analysis : New Method

 
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sikandarsiddiqi
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Joined: 26 Jan 2003
Posts: 294

PostPosted: Thu Jan 29, 2015 8:40 am    Post subject: Progressive Collapse Analysis : New Method Reply with quote

IN GOD WE TRUSTPARDON,PROTECT & HELP US LORD, GOD GIVE US THE WISDOM TO UNDERSTAND YOUR WAY OF CREATION WHICH WE CALL SCIENCE,TO BE EXPERT NEEDS PRACTICE & SELF IMPROVEMENT, LETS PRAY FOR ALL THOSE WHO ARE SICK FOR EARLY RECOVERY & IN DISTRESS,HELP SOME ONE IN POVERTY LEVEL


Dear Engr.Patel,

This refers to your mail flashed by SEFI.


A new method for progressive collapse analysis of RC frames under blast loading
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The progressive collapse of structures under blast loading has attracted great attention all over the world. Some guidelines give specific procedures to analyse the progressive collapse of building structures. Numerical analysis and laboratory test results of the progressive collapse of structures have also been reported in the literature. Because the progressive collapse of a structure induced by blast loading occurs only after the blast-loading phase, most of these studies and guideline procedures perform progressive analysis by removing one or a few load-carrying structural members with static and zero initial conditions. The damage on adjacent structural members that might be induced by blast loads and the inevitable non-zero initial conditions when progressive collapse initiates are neglected. These simplifications may lead to inaccurate predictions of the structural collapse process. In this paper, a new method for progressive collapse analysis of reinforced concrete (RC) frame structures by considering non-zero initial conditions and initial damage to adjacent structural members under blast loading is proposed. A three-storey two-span RC frame is used as an example to demonstrate the proposed method. Numerical results are compared with those obtained using the alternative load path method, and with those from comprehensive numerical simulations by directly applying the blast loads on the frame. It is found that the proposed method with a minor and straightforward extension of the simplified ‘member-removal’ procedure is efficient and reliable in simulating the progressive collapse process of RC frame structures. It requires substantially less computational effort as compared to direct numerical simulations, and gives more accurate predictions of the structural progressive collapse process than the ‘member-removal’ approach.

Keywords
  • Reinforced concrete (RC) frame;
  • Blast loading;
  • Progressive collapse;
  • Numerical analysis;
  • Initial damage;
  • Non-zero initial condition;
  • Direct numerical simulation;
  • ‘Member-removal’ procedure
Corresponding author at: School of Civil Engineering, Tianjin University, Tianjin 300072, China. Tel.: +86 22 2740 2397; fax: +86 22 2740 7177.

With this much now signing off

Regards & Best Wishes.
Blessings of Almighty God be upon all of us.Sincerely,Engr.Sikandar Hayat Siddiqi
Director General & Principal Scientist,Earthquake & Tsunami Safety Management Initiative (ETASMI)/ Chief Technical Co-ordinator,ETASMI Data Center/Chief Executive Officer, ETASMI Information Service /Project & Seismic Design Management Consultant / Earthquake Public Awareness Consultant/Earthquake/Earthquake Damage Assessment&Recontruction Consultant/ ETASMI UFO Information Service Consultant

Our Ref : ETASMI/PA-Patel/29th Aug'14

Dhaka  Bangladesh/Asia Radio Link International Email02:40 PM Dhaka Time,Thursday,29th Jan'15 + 6 Hours GMT

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