Response Analysis for Evaluation of Seismic Performance of Frame-Supported Membrane Structures

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Publication year 2001
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Title Response Analysis for Evaluation of Seismic Performance of Frame-Supported Membrane Structures
Author Kazuo Ishii,Shiro Kato,Hiroshi Ohmori,Kenshi Oda,Masumi Fujimoto,Shojiro Motoyui,Makoto Ohsaki,Shoji Nakazawa,Yoshinao Konishi
Summary Time-history response analysis has been carried out for evaluation of seismic performance of a frame-supported membrane structure. The membrane is modeled by equivalent cables. The structure is subjected to artificial seismic motions with three levels that are generated from the response spectrum at the bedrock and are amplified by the surface soil layers.
The major conclusions drawn from the numerical results are as follows:
1. Dynamic characteristics of a membrane can be successfully modeled by equivalent cables.
2. The unbalanced forces due to prestresses of cables are negligibly small; i. e. form finding analysis is not necessarily be carried out before dynamic analysis.
3. Existence of membrane does not have any effect on dynamic properties of the frameĀEĆbecause the additional mass by membrane is very small.
4. The modes with frame vibration dominate during earthquakeĀEĆand the membrane vibration is not excited.
5. Vibration of frame and membrane do not lead to wrinkling or fracture of membrane under severe earthquake.
It can be concluded from these results that dynamic analysis is not needed for designing a frame-supported membrane structure if it is not requires for the frame itself. A cable model can easily be used even for the case where dynamic analysis is required.