预应力钢-混凝土连续组合梁内力重分布研究  

Research on Internal Force Redistribution of Prestressed Continuous Steel-concrete Composite Beam

作　　者：胡少伟[1] 叶祥飞[1,2] 

机构地区：[1]南京水利科学研究院,南京210024 [2]中南勘测设计研究院,长沙410014

出　　处：《防灾减灾工程学报》2013年第2期231-234,240,共5页Journal of Disaster Prevention and Mitigation Engineering

基　　金：中央级公益性科研院所重大项目(Y410006)资助

摘　　要：内力重分布是研究预应力钢-混凝土连续组合梁的重要内容,是计算其极限抗弯承载力的基础。分析了引起连续组合梁内力重分布的原因,指出主要是受塑性铰的形成及混凝土开裂、连接件的失效等引起的非线性因素的影响,其本质是截面抗弯刚度变化引起的内力再分配;探讨了连续组合梁内力重分布的影响因素,指出配筋力比是影响中支座塑性铰塑性转动能力及弯矩重分布程度的主要参数,给出了3根连续试验梁的极限弯矩调幅系数,并分析了其值偏大的原因。The redistribution of internal force is an important part of the research on prestressed continuous steel-concrete composite beams, which is the basis of calculating the ultimate bending capacity. This paper indicates that the nonlinear factors such as formation of plastic hinges, crack of concrete and failure of connectors are the main reason to casuse the redistribution of internal force. Some factors which can influence the internal force redistribution of the beams were ana- lyzed, and the combined force ratio R in negative-moment region is considered to be the most im portant factor to effect the rotation capacity of hearing＇s plastic hinge and the redistribution of moment. The paper presents the moment modification coefficients of three pieces of continuous composite beam and analyzes why the values are lager than the test results.

关 键 词：预应力钢-混凝土连续组合梁 内力重分布 塑性铰 弯矩调幅 

分 类 号：TU352.1[建筑科学—结构工程]