现浇与装配整体式混凝土框架子结构抗震屈服机制和影响因素分析  

Analysis on yield mechanism and influence factors of cast-in-place and monolithic precast concrete frame substructure

作　　者：张望喜[1,2] 邓俊杰 庞博 徐帅[2] 易伟建[1,2] ZHANG Wangxi;DENG Junjie;PANG Bo;XU Shuai;YI Weijian(Key Lab on Diagnosis for Engineering Structures of Hunan Province,Hunan University,Changsha 410012,China;College of Civil Engineering College,Hunan University,Changsha 410012,China)

机构地区：[1]湖南大学工程结构损伤诊断湖南省重点实验室,湖南长沙410012 [2]湖南大学土木工程学院,湖南长沙410012

出　　处：《地震工程与工程振动》2019年第5期137-146,共10页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(51578228);国家重点研发计划专项项目(2016YFC0701400)~~

摘　　要：“强柱弱梁”屈服机制对混凝土框架结构的抗震性能有着至关重要的影响。在参数和模型验证的基础上,本文通过6个现浇和3个装配整体式混凝土框架子结构有限元模型,分析了裂缝分布、钢筋应力和破坏特征,研究了楼板、柱端弯矩放大系数以及叠合梁板叠合面的摩擦系数对混凝土框架子结构“强柱弱梁”屈服机制的影响。研究发现:在现浇框架子结构中,现浇楼板使梁端的塑性损伤大幅度降低,柱端钢筋的应力值大大增加,不利于“强柱弱梁”屈服机制的形成;当采用较大的柱端弯矩放大系数时,有效地实现“强柱弱梁”屈服机制;在装配整体式框架子结构中,叠合面摩擦系数的变化,并不会改变框架子结构的屈服机制,但会影响其抗侧承载能力和结构整体性。The yield mechanism of“strong column and weak beam”has a vital impact on the aseismic performance of concrete frame structure.Based on the validation of parameters and models,the finite element models of six cast-in-place and three monolithic precast concrete frame substructure were established in this paper.The distribution of cracks,the stress of reinforcing bars and failure characteristics of structure in each model were analyzed.The effects of slabs,different moment augment factor of column end and frictional coefficients of combined interface of combined bean on the yield mechanism of"strong column and weak beam"in concrete frames structure are studied.The results show that the plastic damage at the end of the beam reduces greatly and the stress of steel bar at the end of the column increases significantly in cast-in-place concrete frame substructure.It is not conducive to the formation of yield mechanism of"strong column and weak beam".The yield mechanism of"strong column and weak beam"can be formed effectively when the larger moment augment factor of column end is adopted.In monolithic precast concrete frame substructure,the variation of friction coefficient does not change the yield mechanism of the frame substructure,but influences its lateral bearing capacity and structural integrity.

关 键 词：屈服机制 装配整体式 框架子结构 柱端弯矩放大系数 结构整体性 

分 类 号：TU375.4[建筑科学—结构工程]