钢筋桁架超高性能混凝土叠合板受弯性能试验研究  

EXPERIMENTAL RESEARCH ON FLEXURAL BEHAVIOR OF UHPC COMPOSITE SLABS WITH STEEL TRUSS

作　　者：金凌志[1] 廉德铭 李丽[1] 梁曦 JIN Lingzhi;LIAN Deming;LI Li;LIANG Xi(Guangxi Key Laboratory of Geomechanics and Geomechanical Engineering,Guilin University of Technology,Guilin 541004,China;Infrastructure Management Department,Guilin University of Electronic Technology,Guilin 541004,China;Xingjia Real Estate Development Co.,Ltd.of Liuzhou,Liuzhou 545000,China)

机构地区：[1]广西岩土力学与工程重点实验室,桂林理工大学,广西桂林541004 [2]桂林电子科技大学基建处,广西桂林541004 [3]柳州市兴佳房地产开发有限责任公司,广西柳州545000

出　　处：《工业建筑》2020年第3期69-75,共7页Industrial Construction

基　　金：国家自然科学基金项目(51368013);广西重点实验室项目(11-CX-04)。

摘　　要：通过2块钢筋桁架超高性能混凝土(UHPC)叠合板和1块UHPC整浇板的对比试验,分析钢筋桁架对UHPC叠合板的挠度、裂缝、混凝土应变等抗弯性能的影响;探讨钢筋桁架UHPC叠合板的二次受力效应。研究表明:钢筋桁架UHPC叠合板的受弯性能优于普通混凝土叠合板,截面应变基本符合平截面假定,延性较好,且二次受力现象并不明显;钢筋桁架可以有效地提升叠合板的整体抗弯承载力,减弱受拉钢筋的"应力超前"现象和受压混凝土"应变滞后"现象;取混凝土等效抗拉影响系数k3为0. 35,建立钢筋桁架UHPC叠合板受弯正截面承载力计算式,其计算值与试验数据吻合较好。Based on the experimental study of two ultra-high performance concrete (UHPC) steel truss composite slabs and a concrete slab,the effect of steel truss on the flexural behavior of the UHPC composite slabs,such as deflection,cracks and concrete strain,was analyzed. And the secondary loaded effect of the UHPC steel truss composite slabs was investigated. The study showed that the UHPC steel truss composite slabs had better flexural behavior than ordinary concrete composite slabs. The section strain basically conformed to the plane hypothesis,the ductility was better,and the secondary stress was not obvious. The steel truss could effectively enhance the overall flexural bearing capacity of composite slabs,and weaken the phenomena of "stress excess"of tensile steel and the phenomena of"strain lag"of compressive concrete. The results,which were calculated by the formula of flexural normal section bearing capacity of steel truss UHPC composite slabs,agreed well with the experimental data when the equivalent tensile effect coefficient k3 of concrete was 0. 35.

关 键 词：钢筋桁架 叠合板 抗弯性能 二次受力 延性 

分 类 号：TU375[建筑科学—结构工程]