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按结构影响系数设计的V形中心支撑钢框架抗地震倒塌安全性研究
doi: 10.13204/j.gyjz201506028
RESEARCH ON SEISMIC COLLAPSE MARGIN RATIO OF V-SHAPE CBSF CONSIDERING STRUCTURAL INFLUENCING COEFFICIENT
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摘要: 通过对5个按7度抗震设防的典型V形中心支撑钢框架采用FEMA P695抗地震倒塌安全性评估体系,对其抗地震倒塌安全性进行研究。结果表明:基于结构影响系数R=3.2设计的7度抗震设防V形中心支撑钢框架,具有足够的抗地震倒塌能力,能提供安全的使用空间。进一步的研究表明,该结构具备比大震不倒更强的抗地震倒塌能力,能够特大地震不倒,对结构抗震性态设计有一定参考价值。Abstract: Five typical V-shape concentrically braced steel frames ( CBSF) in zones of seismic intensity VII were designed and their seismic safety was studied according to seismic collapse assessment system of FEMA P695． The results show that the CBSFs based structural influencing coefficientR=3. 2 possess enough anti-collapse capacity， can provide safe room，furthermore，they possess stronger anti-collapse capacity than that ofno callapse in strong earthquake，so that their collapse probability can be accepted under specially strong earthquakes，which can be used in seismic performance-based design．
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Key words:
- seismic collapse /
- collapse margin ratio /
- CBSF /
- IDA /
- safety
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