高温后预制装配式叠合梁受弯性能试验研究  

Experimental study on flexural performance of prefabricated composite beams after high temperature

作　　者：刘才玮[1] 鲁秀亮 王鹏霏 苗吉军[1] 刘延春[1] 赵安琪 LIU Caiwei;LU Xiuliang;WANG Pengfei;MIAO Jijun;LIU Yanchun;ZHAO Anqi(College of Civil Engineering,Qingdao University of Technological,Qingdao 266033,China;Department of Urban Construction,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]北京工业大学城市建设学部,北京100124

出　　处：《建筑结构学报》2023年第3期223-234,共12页Journal of Building Structures

基　　金：山东省自然科学基金项目(ZR2021ME228);中国博士后基金项目(2018M632640);山东省博士后创新项目(2019057);青岛市博士后应用研究项目(2018103)。

摘　　要：为研究荷载比、受火时间、叠合参数对预制装配式混凝土叠合梁高温后残余受弯性能的影响,共设计了14根T形截面叠合梁,其中12根梁分别进行受火试验及受火后静载试验,剩余2根梁进行常温静载试验;采用有限元软件ABAQUS中的三维弹簧单元模拟了预制-现浇混凝土叠合面的相互作用,提出了叠合梁受火后受弯承载力计算方法。研究结果表明:随受火时间增加,叠合梁残余承载力逐渐降低;相同受火时间下,荷载比越大,叠合参数越小,截面所历经的最高温度越大。荷载比与叠合参数均对叠合梁残余承载力有一定影响,受火时间为120 min时,同一叠合参数下,荷载比为0的梁的残余承载力较荷载比为0.44的提高了19%;相同荷载比下,叠合参数为0.6的梁残余承载力较叠合参数为0.4的提高了24%。考虑到高温后普通混凝土梁残余承载力计算式不再适用于叠合梁,通过引入折减系数,提出了适用于火灾后叠合梁残余承载力简化公式,其计算值与试验值误差4%~12%,精确度较高。To study the influence of load ratio, fire exposure time, and composite parameters on the residual bending performance of prefabricated concrete composite beams after high temperature, 14 reinforced concrete T-shape composite beams were designed, where 12 beams were subjected to fire tests and post-fire static test and two beams were subject to the static test under room temperature. The interaction of precast concrete and cast-in-place concrete on the composite surface was simulated by the three-dimensional spring element in ABAQUS, and the calculation method of the residual flexural capacity of the composite beams after the fire was proposed. The research results show that the residual capacity decreases with respect to the increasing fire time, the larger the load ratio, the smaller the composite parameters, and the higher temperature of specimens is experienced. The load ratio and the composite parameters all have effects on the residual capacity of specimens. Taking 120 min as an example, under the same composite parameters, the residual capacity of the specimen with a load ratio of 0 is 19% higher than that of 0.44. Under the same load ratio, the residual bearing capacity of the specimen with the composite parameter of 0.6 is 24% higher than that of 0.4. Considering that the formula for calculating the residual bearing capacity of ordinary reinforced concrete beams after high temperature may no longer apply to composite beams, a formula for calculating the residual flexural capacity of composite beams after fire was proposed by introducing the reduction parameters, and the error between the calculated value and the test value is about 4%-12% with high accuracy.

关 键 词：预制装配式叠合梁 受火试验 静力试验 裂缝 温度场 残余承载力 

分 类 号：TU375.103[建筑科学—结构工程]