钢筋混凝土框架结构强柱弱梁破坏机制的控制  

Control of strong column weak beam failure mechanism for RC frame structure

作　　者：马煜东 刘伯权[1] 邢国华[1] 黄娇 MA Yudong;LIU Boquan;XING Guohua;HUANG Jiao(School of Civil Engineering,Chang’an University,Xi’an 710064,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710064

出　　处：《建筑结构学报》2023年第12期154-169,共16页Journal of Building Structures

基　　金：国家自然科学基金项目(51578077)。

摘　　要：框架结构的破坏机制是构件间变形发展差异的最终结果,现有的破坏机制控制方法大多是基于梁柱间的强度关系,忽视了其本质原因。为此,从构件变形的角度,以梁柱线刚度比为控制参数,建立了框架结构“强柱弱梁”型破坏机制的控制方程;同时,通过试验和有限元分析,对框架结构的破坏机制、构件变形和塑性铰分布进行了进一步分析。结果表明:轴压比及梁柱线刚度比的减小会使梁端变形增加,使其塑性铰发育更为充分,且其在一定程度上可以减小柱端的变形;“强柱弱梁”破坏机制下,梁端变形明显大于柱端,底层构件的变形普遍高于上层构件,中跨构件的变形略高于边跨,但并不明显;采用建立的破坏机制控制方程对结构进行调整后可以有效地减小框架结构中柱端的塑性铰数量及其发展程度,使结构呈现“强柱弱梁”破坏。The failure mechanism of the frame structure is resulted by the difference in the development of deformation among the members.Most of the existing control methods for structural failure mechanisms are based on the strength relationship between beams and columns,which ignores the essential causes.In this paper,from the point of view of member deformation,the control methods for the failure mechanism of strong column and weak beam of frame structure was established with the beam-column linear stiffness ratio as the controlling parameter.In additional,the failure mechanism,member deformation and plastic hinge distribution of the frame structure were further analyzed through experimental studies and finite element analysis.The results show that the decrease in axial compression ratio and beam-column linear stiffness ratio can increase the deformation of the beam end and cause its plastic hinge fully developed,and it also can reduce the deformation of the column.For the frame structure with the failure mechanism of strong column and weak beam,the deformation of the beam is significantly larger than that of the column.Deformation in the bottom members is generally larger than that in the upper members,and the deformation in the middle span members is slightly larger than that in the side spans.The control methods effectively reduce the number and development degree of plastic hinges at the column ends,resulting in the frame structure exhibiting the strong column and weak beam failure mechanism.

关 键 词：钢筋混凝土框架结构 强柱弱梁 梁柱线刚度比 控制方程 破坏机制 

分 类 号：TU375.4[建筑科学—结构工程] TU311.41