腹板开洞钢-混凝土连续组合梁塑性铰及内力重分布试验研究  

EXPERIMENTAL STUDY ON PLASTIC HINGE AND INTERNAL FORCE REDISTRIBUTION OF CONTINUOUS STEEL-CONCRETE COMPOSITE BEAMS WITH WEB OPENINGS

作　　者：李龙起[1] 周东华[1] 廖文远[1] 姚凯程[1] 

机构地区：[1]昆明理工大学土木工程学院,云南昆明650224

出　　处：《工程力学》2015年第11期123-131,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(51268022);国家青年科学基金项目(51308269)

摘　　要：为研究腹板开洞连续组合梁的受力性能,对5根腹板开洞连续组合梁和1根腹板无洞连续组合梁进行了试验对比研究。研究的重点为腹板开洞连续组合梁的塑性铰特性及内力重分布现象。试验结果表明:腹板开洞降低了连续组合梁的刚度和承载能力,洞口区域不再符合平截面假定。5根腹板开洞连续组合梁的破坏过程均为在洞口处形成剪力铰并最终形成破坏机构从而丧失承载能力。与腹板无洞连续组合梁相比,腹板开洞连续组合梁在按弹性计算时就已经存在"调幅"现象。另外,试验表明连续组合梁开洞后不仅存在弯矩重分布而且在带洞跨还存在混凝土板和钢梁之间的剪力重分布现象。In order to investigate the mechanical performance of continuous steel-concrete composite beams with web openings, five continuous composite beams with web openings and a continuous composite beam without web openings were tested. The behavior of plastic hinges and internal force redistribution were studied emphatically. The test results show that web openings decrease the stiffness and the ultimate load-carrying capacity. The plane hypothesis is not satisfied for section in the web opening area. The failure process of the five continuous composite beams shows that a shear force plastic hinge first formed and ultimately a kinematical mechanism generated in the region of the web opening. The continuous composite beams with web openings have already shown redistribution phenomenon when compared with the composite beams without web openings in elastic stage. In addition, the results reveal not only moment redistribution but also shear force redistribution between the concrete and steel components for continuous composite beams with web openings.

关 键 词：连续组合梁 腹板开洞 塑性铰 内力重分布 试验研究 

分 类 号：TU317.1[建筑科学—结构工程] TU398.9