周期折减系数对地震作用的影响
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摘要
框架结构、框架—剪力墙结构设计通常未考虑非承重填充墙对结构刚度的贡献,计算地震作用时,使地震影响系数中结构自振周期乘以周期折减系数来进行折减,从而使地震力放大。算例表明,周期折减系数减小0.1,框架结构和框架—剪力墙结构地震力分别增大约10%、5%-7%,层间位移角分别增大约11%、10%.周期折减系数取值不同不会影响上述两种结构的自振周期。建议,当填充墙较多时,框架结构和框架—剪力墙结构周期折减系数分别取0.65、0.75;填充墙较少时,周期折减系数分别取0.75、0.85.
Calculating the earthquake function,self oscillation cycle in the earthquake function factor multiplied the cycle reduction factor to carry out the discount to make seismic force bigger,due to the rigidity contribution for the non-load-bearing infilled wall to the structure usually doesn't considered during designing the frame construction and shear wall construction.Examples show that the cycle reduction factor of the frame construction and the shear wall construction respectively reduce 0.1,the seismic force respectively increase approximately 10%,5%-7%,the angle of floor displacement respectively increase about 11%,10%.The cycle reduction factor does not effect the self oscillation cycle of the above two kind of structures.Suggestions,the cycle reduction factor respectively take 0.65 and 0.75 when the infilled walls are many and respectively take 0.75 and 0.85 when the infilled walls are little for the frame construction and shear wall construction.
Calculating the earthquake function,self oscillation cycle in the earthquake function factor multiplied the cycle reduction factor to carry out the discount to make seismic force bigger,due to the rigidity contribution for the non-load-bearing infilled wall to the structure usually doesn't considered during designing the frame construction and shear wall construction.Examples show that the cycle reduction factor of the frame construction and the shear wall construction respectively reduce 0.1,the seismic force respectively increase approximately 10%,5%-7%,the angle of floor displacement respectively increase about 11%,10%.The cycle reduction factor does not effect the self oscillation cycle of the above two kind of structures.Suggestions,the cycle reduction factor respectively take 0.65 and 0.75 when the infilled walls are many and respectively take 0.75 and 0.85 when the infilled walls are little for the frame construction and shear wall construction.
引文
[1]JG J3-2002,高层建筑混凝土结构技术规程[S].
[2]张敬书,姜丽娜,冯立平,等.周期折减系数合理取值的探讨[J].建筑技术,2010,41(1):49-51.
[3]鄢定保,王广俊.对《高规》中结构自振周期折减系数取值的探讨[J].四川建筑,2009,29(6):107-111.
[4]建设部工程质量安全监督与行业发展司/中国建筑标准设计研究所.全国民用建筑工程设计技术措施—结构[M].北京:中国计划出版社,2003.
[5]龚思礼.建筑抗震设计手册[M].北京:中国建筑工业出版社,2002.
[6]沈蒲生.高层建筑结构设计[M].北京:中国建筑工业出版社,2008.
[2]张敬书,姜丽娜,冯立平,等.周期折减系数合理取值的探讨[J].建筑技术,2010,41(1):49-51.
[3]鄢定保,王广俊.对《高规》中结构自振周期折减系数取值的探讨[J].四川建筑,2009,29(6):107-111.
[4]建设部工程质量安全监督与行业发展司/中国建筑标准设计研究所.全国民用建筑工程设计技术措施—结构[M].北京:中国计划出版社,2003.
[5]龚思礼.建筑抗震设计手册[M].北京:中国建筑工业出版社,2002.
[6]沈蒲生.高层建筑结构设计[M].北京:中国建筑工业出版社,2008.
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