高烈度区隔震砌体结构的抗震设计讨论

我国《建筑抗震设计规范》于2001年颁布实施,其中关于隔震砌体结构的设计要求过严.针对罕遇烈度地震作用下隔震砌体结构隔震层的位移进行了讨论分析.由算例可知,相比于89规范,按等效侧力法计算时隔震砌体结构隔震层的位移提高了47.4%;而按时程分析法,仅提高了27.5%.为使两种结构相一致,建议对隔震砌体结构不采用新规范中罕遇地震验算对场地土特征周期关于0.05 s的延长.

Seismic design discussion of isolated masonry structures in high seismic intensity area

Our new building seismic design code has been performed since 2001. But its demands for isolated masonry structure are too high. Displacement of isolating system of masonry structure under seldom countering seismic intensity is discussed here. Calculating example shows that by equivalent lateral force method, the displacement of isolating system is increased by 47.4 % comparing to that with old building seismic design code. But it is increased only by 27.5% by time history method. So in order to coordinate results from these two methods, it is suggested that under seldom seismic intensity its soil characteristic period does not be increased for 0.05s for isolated masonry structure.