正交异性钢-混凝土组合板负弯矩区抗弯性能分析  

Analysis on negative moment bending behaviors of orthotropic steel-concrete composite slabs

作　　者：李卓 陈玉立 单玉麟[1,2] 宗周红 许有胜[3] Li Zhuo;Chen Yuli;Shan Yulin;Zong Zhouhong;Xu Yousheng(Engineering Research Center of Safety and Protection of Explosion and Impact of Ministry of Education,Southeast University,Nanjing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China;Shenzhen Municipal Design and Research Institute Co.,Ltd.,Shenzhen 518029,China)

机构地区：[1]东南大学爆炸安全防护教育部工程研究中心,南京211189 [2]东南大学土木工程学院,南京211189 [3]深圳市市政设计研究院有限公司,深圳518029

出　　处：《东南大学学报（自然科学版）》2023年第3期485-495,共11页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(52178462).

摘　　要：为探究正交异性钢-混凝土组合板负弯矩区的抗弯性能,对3块正交异性钢-混凝土组合板进行了抗弯静载试验和非线性数值分析,研究了不同因素对混凝土负弯矩开裂荷载和组合板整体抗弯极限承载力的影响.结果表明:正交异性钢-混凝土组合板呈现典型的弯曲破坏形态;当钢纤维体积分数为1%时,钢-混凝土组合板开裂弯矩的提升率最大,但钢纤维体积分数的改变对整体抗弯极限承载力影响较小;正交异性钢-混凝土组合板的开裂弯矩与正交异性钢板强度无关,极限弯矩则随钢板强度的增加而增大;增加混凝土板厚能提高组合板开裂弯矩和极限弯矩,当混凝土板厚度与正交异性钢板高度比值为0.8时,开裂弯矩的提升率最大.To investigate the negative moment bending behaviors of orthotropic steel-concrete composite slabs,static bending tests and nonlinear numerical simulation were conducted on three orthotropic steel-concrete composite slabs.The effects of different factors on the negative moment cracking load of concrete and the overall flexural ultimate bearing capacity of the composite slabs were studied.The results indicate that the orthotropic steel-concrete composite slab exhibits a typical bending failure pattern.When the volume fraction of steel fibers is 1%,the improvement efficiency of the cracking moment of the steel-concrete composite slab is the most significant,but the change of the volume fraction of steel fibers has a small effect on the ultimate bending bearing capacity.The cracking moment of the orthotropic steel-concrete composite slab is not related to the strength of the orthotropic steel slab,but its ultimate bending moment increases with the increase of the steel slab strength.Increasing the thickness of the concrete slab can increase the cracking moment and ultimate bending moment of the composite slab.When the ratio of the thickness of the concrete slab to the height of the orthotropic-steel slab is 0.8,the improvement rate of the cracking moment is the highest.

关 键 词：正交异性钢-混凝土组合板 负弯矩抗弯性能 抗弯静载试验 非线性数值模拟 

分 类 号：TU398.1[建筑科学—结构工程]