波纹腹板内衬混凝土组合梁高温下抗剪性能研究  

Shear Behavior of Concrete-reinforced Web Composite Beams with Corrugated Webs at High Temperature

作　　者：周焕廷[1] 曹景曦 崔帅 ZHOU Huanting;CAO Jingxi;CUI Shuai(School of Civil Engineering and architecture Wuhan University of Technology,Wuhan 430070,China;Shandong Xinhui Construction Group Co.Ltd.,Dongying 257091,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,武汉430070 [2]山东新汇建设集团有限公司,东营257091

出　　处：《武汉理工大学学报（交通科学与工程版）》2024年第3期508-514,共7页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金(51878528)。

摘　　要：文中采用有限元软件建立波纹钢腹板组合梁(CBCW)和波纹钢腹板内衬混凝土组合梁(CBCWC)在火灾下的数值模型,研究组合梁高温下主应力、剪应力演化和组合梁截面各部件的承剪比.结果表明:在高温条件下,内衬混凝土中温度梯度改变了内衬混凝土的承剪能力和传力路径,进而影响CBCWC的剪力分配机制.相对于CBCW,高温下CBCWC中波纹钢腹板的抗剪性能得到显著提升.在临界状态时,CBCW的失效机理为波纹钢腹板发生严重的剪切屈曲,CBCWC的抗剪机理可等效为力学“桁架”模型,失效机理为等效拉杆和等效压杆丧失承载能力.CBCWC中布置的内衬混凝土抑制了波纹钢腹板的高温剪切屈曲,显著提高了组合梁高温下的耐火极限.The numerical models of corrugated steel web composite beam(CBCW)and corrugated steel web-lined concrete composite beam(CBCWC)under fire were established by using finite element software,and the evolution of principal stress and shear stress of composite beams at high temperature and the bearing-shear ratio of each component of composite beam section were studied.The results show that the temperature gradient in the lining concrete changes the bearing capacity and force transmission path of the lining concrete at high temperature,and then affects the shear distribution mechanism of CBCWC.Compared with CBCW,the shear performance of corrugated steel webs in CBCWC is significantly improved at high temperature.In the critical state,the failure mechanism of CBCW is severe shear buckling of corrugated steel webs,and the shear mechanism of CBCWC can be equivalent to a mechanical“truss”model,and the failure mechanism is the loss of bearing capacity of equivalent tie bars and equivalent compression bars.Compared with CBCW,the lining concrete arranged in CBCWC inhibits the high-temperature shear buckling of corrugated steel webs and significantly improves the fire resistance of composite beams at high temperatures.

关 键 词：耐火性能 抗剪性能 波纹钢腹板 内衬混凝土 非线性有限元 

分 类 号：U458[建筑科学—桥梁与隧道工程]