预应力型钢超高强混凝土梁抗剪承载力试验研究*
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(大连理工大学港口和近海工程国家重点实验室， 大连 116024)［摘要］基于8根预应力型钢超高强混凝土简支梁的抗剪承载力试验，研究了在集中荷载作用下预应力型钢超高强混凝土简支梁的正截面开裂荷载、斜截面开裂荷载、屈服荷载、极限抗剪承载力、荷载挠度曲线特性以及梁破坏形态，分析了预应力度、配箍率、型钢腹板含钢率对梁抗剪承载力以及延性的影响规律。通过回归分析，建立了集中荷载作用下预应力型钢超高强混凝土梁抗剪承载力的计算公式，计算结果与试验结果吻合较好。［关键词］预应力; 型钢混凝土; 超高强混凝土; 抗剪承载力; 延性中图分类号：TU398+.9 文献标识码：A 文章编号：1002-848X(2013)21-0023-04Experimental investigation on shear bearing capacity of prestressed steel reinforced ultra-high-strength concrete beamsJia Jinqing, Liu Mingming, Yao Dali, Cai Jing(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)Abstract: Based on the shear bearing capacity experiment of 8 prestressed steel reinforced ultra-high-strength concrete simply supported beams, the normal section crack load, the inclined section crack load, yield load, ultimate shear bearing capacity, characteristics of load-deflection curves and failure patterns of the beams under concentrated loads were analyzed. The effects of prestress degree, stirrup ratio and steel ratio of steel web on the shear bearing capacity and ductility were also thoroughly researched through the experiment. The calculation equation of the shear bearing capacity of such beams under concentrated loads was obtained by regression, and the calculation results agree well with the test conclusions.Keywords: prestressed; steel reinforced concrete; ultra-high-strength concrete; shear bearing capacity; ductility*国家自然科学基金资助项目（51078059）。作者简介：贾金青，教授，博士生导师，Email: mingming_liu8@163.com。参考文献［1］贾金青．型钢高强混凝土柱的力学性能［M］．大连：大连理工大学出版社，2006：13-15.［2］JOSEF H,CLAUS G.Structural behavior of partially concrete encased composite sections with high strength concrete［C］//Proceeding of ASCE,Composite Construction in Steel and Concrete V.2006，186(33)：346-355.［3］逯晔，叶列平，孙海林，等. 高强轻骨料混凝土梁抗剪承载力的试验分析与计算［J］. 建筑结构，2008，38(5): 16-21.［4］史庆轩，侯炜，姜维山，等.高强箍筋高强混凝土梁受剪承载力研究［J］.建筑结构学报，2009，30(S2):98-103.［5］郑山锁，胡义，车顺利，等.型钢高强高性能混凝土梁抗剪承载力试验研究［J］.工程力学，2011，28(3):129-135.［6］刘坚,主编.钢与混凝土组合结构设计原理［M］.北京：科学出版社，2005：118-122.［7］中国土木工程学会高强混凝土委员会.高强混凝土结构设计与施工指南［M］. 2版. 北京：中国建筑工业出版社，2011.
