預(yù)應(yīng)力型鋼超高強(qiáng)混凝土梁抗剪承載力試驗(yàn)研究*
賈金青，劉明明，姚大立，蔡靜
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(大連理工大學(xué)港口和近海工程國家重點(diǎn)實(shí)驗(yàn)室， 大連 116024)［摘要］基于8根預(yù)應(yīng)力型鋼超高強(qiáng)混凝土簡支梁的抗剪承載力試驗(yàn)，研究了在集中荷載作用下預(yù)應(yīng)力型鋼超高強(qiáng)混凝土簡支梁的正截面開裂荷載、斜截面開裂荷載、屈服荷載、極限抗剪承載力、荷載撓度曲線特性以及梁破壞形態(tài)，分析了預(yù)應(yīng)力度、配箍率、型鋼腹板含鋼率對梁抗剪承載力以及延性的影響規(guī)律。通過回歸分析，建立了集中荷載作用下預(yù)應(yīng)力型鋼超高強(qiáng)混凝土梁抗剪承載力的計(jì)算公式，計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好。［關(guān)鍵詞］預(yù)應(yīng)力; 型鋼混凝土; 超高強(qiáng)混凝土; 抗剪承載力; 延性中圖分類號：TU398+.9 文獻(xiàn)標(biāo)識碼：A 文章編號：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*國家自然科學(xué)基金資助項(xiàng)目（51078059）。作者簡介：賈金青，教授，博士生導(dǎo)師，Email: mingming_liu8@163.com。參考文獻(xiàn)［1］賈金青．型鋼高強(qiáng)混凝土柱的力學(xué)性能［M］．大連：大連理工大學(xué)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］逯曄，葉列平，孫海林，等. 高強(qiáng)輕骨料混凝土梁抗剪承載力的試驗(yàn)分析與計(jì)算［J］. 建筑結(jié)構(gòu)，2008，38(5): 16-21.［4］史慶軒，侯煒，姜維山，等.高強(qiáng)箍筋高強(qiáng)混凝土梁受剪承載力研究［J］.建筑結(jié)構(gòu)學(xué)報(bào)，2009，30(S2):98-103.［5］鄭山鎖，胡義，車順利，等.型鋼高強(qiáng)高性能混凝土梁抗剪承載力試驗(yàn)研究［J］.工程力學(xué)，2011，28(3):129-135.［6］劉堅(jiān),主編.鋼與混凝土組合結(jié)構(gòu)設(shè)計(jì)原理［M］.北京：科學(xué)出版社，2005：118-122.［7］中國土木工程學(xué)會高強(qiáng)混凝土委員會.高強(qiáng)混凝土結(jié)構(gòu)設(shè)計(jì)與施工指南［M］. 2版. 北京：中國建筑工業(yè)出版社，2011.
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