四边简支单向预应力双向配筋混凝土叠合楼板试验研究*
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（1 湖南大学土木工程学院，长沙 410082；2 湖南高岭建设集团股份有限公司，长沙 410153；3 中机国际工程设计研究院有限责任公司，长沙 410007）［摘要］对一个四边简支单向预应力双向配筋混凝土叠合楼板的大比例模型进行了试验，并对其变形特征、裂缝分布、破坏形态和极限承载力等进行了研究。试验研究结果表明：均布荷载-挠度曲线近似为两折线，当拼缝之外的裂缝(垂直预应力方向裂缝和斜向裂缝等)出现时，曲线发生明显转折，楼板刚度迅速降低，因此，楼板的开裂荷载应取拼缝之外的裂缝出现时所对应的荷载；楼板开裂前，荷载主要由预应力方向承担，预应力的存在提高了楼板的开裂荷载，但降低了楼板的延性，楼板首次开裂便出现了大量斜裂缝；楼板破坏时的裂缝分布和破坏形态具有典型的塑性铰线特征。基于塑性绞线理论，推导了均布荷载作用下四边简支单向预应力双向配筋混凝土叠合楼板的极限承载力公式与塑性绞线形成位置，计算结果与试验结果吻合良好。［关键词］预应力混凝土; 叠合楼板; 试验; 破坏模式; 塑性铰线中图分类号：TU378.5 文献标识码：A 文章编号：1002-848X(2014)05-0006-06Experimental study on four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floorslabWu Fangbo1, Deng Libin1,2, Liu Biao1, Li Jun1, Chen Saiguo3(1 College of Civil Engineering, Hunan University, Changsha 410082, China; 2 Hunan Gaoling Construction Group Stock Limited Company, Changsha 410153, China; 3 China Machinery International Engineering Design & Research Institute Co., Ltd., Changsha 410007, China)Abstract: A large-scale model of four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floorslab was tested. Deformation behavior, crack distribution, failure pattern and ultimate bearing capacity were studied. The test results are as follows.The uniform load-displacement curve is approximate a double-straight line. When cracks beyond gap (such as crack perpendicular to the prestress direction and diagonal crack, etc) appear, the curve marks significant turnaround and floorslab stiffness drops rapidly. So the cracking load of floorslab should adopt the corresponding load when cracks beyond gap appear. Before cracking, load is mainly bore by the prestress direction of floorslab. The prestress increases the cracking load of floorslab, but reduces the floorslab ductility. The floorslab appears a lot of diagonal cracks during the first time of cracking. The crack distribution and failure pattern of floorslab show typical yield-line characteristics. Based on the yield-line theory, equations for the ultimate bearing capacity formative locations for yield line of four-sides simply supported single-direction-prestress double-direction-tendon concrete composite floorslab under uniform loads were developed and the calculation results showed good agreement with the experimental data.Keywords: prestressed concrete; composite floorslab; test; failure pattern; yield-line*国家自然科学基金面上项目(51278179)，长沙市科技计划项目（K1205229-11）。作者简介：吴方伯，硕士，教授，博士生导师， Email：wfbprof@163.com。参考文献［1］曾垂军，吴方伯，刘锡军，等. 新型叠合结构体系的设计与施工［J］. 建筑科学, 2006, 22(4): 67-71.［2］田安国. 冷轧带肋钢筋混凝土叠合板试验研究［J］. 建筑结构, 2000, 30(1): 35-37.［3］GB 50010—2010 混凝土结构设计规范［S］. 北京: 中国建筑工业出版社, 2011.［4］GB/T 16727—2007 叠合板用预应力混凝土底板［S］. 北京: 中国标准出版社, 2007.［5］王晓锋. 单向预应力双向叠合板楼盖试验研究［D］. 北京：中国建筑科学研究院, 2003.［6］胡肇滋，钱寅泉. 正交构造异性板刚度计算的探讨［J］. 土木工程学报，1987, 20(4): 49-61.［7］安海玉，贾莉，丁永君. 预应力混凝土双向叠合板力学性能试验研究及应用［J］. 建筑结构, 2012, 42(12): 90-93.［8］吴方伯, 黄海林, 陈伟, 等. 预制带肋薄板混凝土叠合板件受力性能试验研究［J］. 土木建筑与环境工程, 2011, 33(4): 7-12.［9］GB/T 50152—2012 混凝土结构试验方法标准［S］. 北京: 中国建筑工业出版社, 2012.
