套建增层巨型框架抗震设计方法

Research on aseismic design of outer-jacketing mega frame for storey-adding

为解决套建增层巨型框架结构在罕遇地震作用下的倒塌分析以及与施工相结合的设计方法等方面研究滞后于工程实践的问题,利用弹塑性分析程序IDARC2D分析现行抗震规范规定的I～III类场地土、第一～三地震分组、7～8度设防烈度的套建增层巨型框架的弹塑性地震反应,研究其倒塌机制.结果表明,底层巨型框架的设计是控制结构实现梁铰机制的关键.提出通过适当提高框架抗震等级的措施来避免倒塌.结合施工的实际情况,凝炼了套建增层巨型框架的施工技术措施.基于弹塑性地震分析结果提出与施工相结合的设计方法,为套建增层巨型框架结构的设计提供参考.

For the reason that the research on outer-jacketing mega frame for storey-adding＇ collapse and design method that considering construction lags behind that of practice,outer-jacketing mega frames for storey-adding in Site-class I-III,design seismic group 1st-3rd,seismic fortification intensity 7-8 were analyzed and the collapse mechanism was studied by elasto-plastic analyze program IDARC2D.It reveals that the design of bottom frame is the key point to make the structure damaged with beam-hinge mechanism.Measures to avoid collapse of structure by enhance the grade suitably were put forwarded.Construction technical measures were refined according to construction practice,design method was presented based on the elasto-plastic analysis results,that provide preference for the design of outer-jacketing mega frame for storey-adding.