RC巨型框架结构抗震设计中的能力设计措施

Capacity Design Measure in Seismic Design of RC Mega-Frame Structures

以位于巨型梁上的次框架底层柱底截面组合弯矩设计值增强系数的不同取值为变量进行多个典型巨型平面框架设计。采用平面结构弹塑性动力分析程序Drain-2d+对每个典型巨型框架在地震作用下进行弹塑性时程分析,得出了这些巨型框架在地震作用时的受力变形特点、塑性铰出现情况和整个结构的薄弱环节等,从中找出位于巨梁上的次框架底层柱底截面弯矩设计值增强系数取值的正确思路,并给出设计的合理取值,为钢筋混凝土巨型结构设计提出一些建议。

It provides several typical mega plane frame designs on condition that the variables are the combination of varying amplification factors of moment at bottom sections of ground floor columns of the minor frame on the major beams. The elastic-plastic dynamic analysis program Drain-2d+ of the plane structure is used to get elastic-plastic time-history analysis for each typical mega frame under the action of seism. The autuors obtain the information of the mechanical transmutation characteristics, the emergency of the plastic hinge and the weak point of the whole structure under the action of seism, from which the correct thinking of how to obtain the design value of amplification factors of moments at bottom sections of ground floor columns of the minor frame on the major beams is found. The reasonable design values are recommended in order to provide some suggestions for the design of the reinforced concrete mega-frame structure.