预制T形肋底板混凝土叠合板弯曲疲劳性能试验研究
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摘要
为研究T形肋对混凝土叠合板弯曲疲劳性能的影响,进行了预制T形肋底板混凝土叠合板和整浇板的弯曲疲劳性能对比试验。通过对比试验得到了不同疲劳循环加载次数下的跨中挠度、混凝土应变、预应力筋应变、残余变形等,研究了试件在疲劳循环荷载下的刚度退化情况、荷载-应变分布、裂缝分布及残余承载力等。结果表明:经历200万次疲劳作用后,预制T形肋底板混凝土叠合板无明显刚度和承载力退化,增设T形肋的叠合板能达到与整浇板相同的疲劳性能。基于试验结果,给出了预制T形肋底板混凝土叠合板正截面弯曲疲劳强度计算假定以及正截面弯曲疲劳应力验算方法。
In order to study the influence of T-type rib on the bending fatigue behavior of concrete composite slab,the contrast experimental study was conducted between concrete composite slab with precast prestressed T-type rib panel and cast-in-place slab. During the fatigue experiments,the mid-span deflection,strain of concrete and prestressing tendons and residual deflection after different loading cycles were measured. The stiffness degradation, strain distribution,crack distribution and residual bearing capacity were analyzed. Results show that composite slabs with precast prestressed T-type rib panel have no obvious stiffness and strength degradation after two million times of fatigue cycles,which can achieve the same fatigue behavior as cast-in-place slabs. Assumptions and design formulas for normal section bending fatigue strength of concrete composite slab are put forward based on the test results.
In order to study the influence of T-type rib on the bending fatigue behavior of concrete composite slab,the contrast experimental study was conducted between concrete composite slab with precast prestressed T-type rib panel and cast-in-place slab. During the fatigue experiments,the mid-span deflection,strain of concrete and prestressing tendons and residual deflection after different loading cycles were measured. The stiffness degradation, strain distribution,crack distribution and residual bearing capacity were analyzed. Results show that composite slabs with precast prestressed T-type rib panel have no obvious stiffness and strength degradation after two million times of fatigue cycles,which can achieve the same fatigue behavior as cast-in-place slabs. Assumptions and design formulas for normal section bending fatigue strength of concrete composite slab are put forward based on the test results.
引文
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[2]朱茂存.大跨夹芯叠合板的试验研究与施工分析[D].哈尔滨:哈尔滨工业大学,2001:10-20.(ZHU Maocun.Experimental study and construction analysis of large-span prestressed concrete laminated void slab[D].Harbin:Harbin Institute of Technology,2001:10-20.(in Chinese))
[3]姜忻良,岳建伟.陶粒叠合层叠合板的承载能力研究[J].四川大学学报(工程科学版),2006,38(6):6-12.(JIANG Xinliang,YUE Jianwei.Bearing capacities of ceram site concrete composite slabs with trough bottom plate[J].Journal of Sichuan University(Engineering and Science Edition),2006,38(6):6-12.(in Chinese))
[4]刘汉朝,蒋青青.倒“T”形叠合简支板的试验研究[J].中南大学学报(自然科学版),2004,35(1):147-150.(LIU Hanchao,JIANG Qingqing.Experiment of inverted“T”simply supported composite slab[J].Journal of Central South University(Science and Technology),2004,35(1):147-150.(in Chinese))
[5]沈春祥.预应力混凝土双向叠合板试验研究[D].天津:天津大学,2005:5-20.(SHEN Chunxiang.Experimental study on two-way prestressed laminated concrete slab[D].Tianjin:Tianjin University,2005:5-20.(in Chinese))
[6]周绪红,吴方伯,刘占科,等.新型装配整体式房屋结构体系[C]//2008年汶川地震建筑震害分析与重建研讨会论文集.北京:中国建筑工业出版社,2008:455-462.
[7]吴方伯,黄海林,陈伟,等.预制带肋底板混凝土双向叠合板实用弹性计算方法[J].建筑结构,2012,42(4):99-103.(WU Fangbo,HUANG Hailin,CHEN Wei,et al.Practical elastic calculation methods of concrete two-way composite slab with precast ribbed panels[J].Building Structure,2012,42(4):99-103.(in Chinese))
[8]吴方伯,黄海林,陈伟,等.预制带肋底板混凝土双向叠合板极限承载力[J].土木建筑与环境工程,2011,33(5):34-40.(WU Fangbo,HUANG Hailin,CHEN Wei,et al.Ultimate bearing capacity of concrete twoway composite slabs with precast concrete ribbed panels[J].Journal of Civil,Architectural&Environmental Engineering,2011,33(5):34-40.(in Chinese))
[9]黄海林.预制带肋底板混凝土叠合楼板受力性能及设计方法[D].长沙:湖南大学,2013:56-90.(HUANG Hailin.Structural behavior and design method of concrete composite slab with precast prestressed concrete ribbed panel[D].Changsha:Hunan University,2013:56-90.(in Chinese))
[10]ZHANG Jingshu,YAO Yuan,ZHOU Xuhong,et al.Failure mode and ultimate bearing capacity of precast ribbed panels used for concrete composite slabs[J].Advances in Structural Engineering,2013,16(12):2005-2017.
[11]吴方伯,刘彪,周绪红,等.新型叠合楼板的叠合面连锁咬合效应分析[J].湖南大学学报(自然科学版),2014,41(2):1-7.(WU Fangbo,LIU Biao,ZHOU Xuhong,et al.Analysis of the interlocking effect of the combined interface in a new type of composite floor[J].Journal of Hunan University(Natural Science),2014,41(2):1-7.(in Chinese))
[12]ZHANG Jingshu,WANG Yanzhong,YAO Yuan,et al.Influence of reinforcement on in-plane mechanical behaviors of CSPRP under cyclic reversed load[J].Materials and Structures,2014,14(12):200-217.
[13]杨勇,刘玉擎,范海丰.FRP-混凝土组合桥面板疲劳性能试验研究[J].工程力学,2011,28(6):66-73.(YANG Yong,LIU Yuqing,FAN Haifeng.Experimental study on the fatigue behavior of FRPconcrete composite decks[J].Engineering Mechanics,2011,28(6):66-73.(in Chinese))
[14]杨勇,聂建国,杜明珠,等.闭口型压型钢板-混凝土组合板疲劳性能试验研究[J].土木工程学报,2008,41(12):35-41.(YANG Yong,NIE Jianguo,DU Mingzhu,et al.Experimental study on the fatigue performance of closed profiled steel sheeting-concrete composite slabs[J].China Civil Engineering Journal,2008,41(12):35-41.(in Chinese))