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(1 南京水利科學(xué)研究院 210029；2 清華大學(xué)土木系 北京 100084)
［提要］為研究鋼混凝土組合梁的彎扭性能，完成了6根箱形組合梁的純扭和彎扭試驗(yàn)，詳述了在不同扭彎比下箱形組合梁的受力性能及破壞形態(tài)，對(duì)裂縫發(fā)展和應(yīng)力的變化情況進(jìn)行了分析，揭示了箱形組合梁在彎扭復(fù)合作用下，極限扭矩和極限彎矩會(huì)相應(yīng)提高的機(jī)理。對(duì)組合梁扭型破壞和彎型破壞進(jìn)行了對(duì)比分析，指出了根據(jù)傳統(tǒng)的彎剪扭相關(guān)方程而得到的相關(guān)公式的不合理性，并給出了在復(fù)合彎扭和彎剪扭下的相關(guān)公式，得到的結(jié)論能為組合梁計(jì)算和分析設(shè)計(jì)提供參考。
［關(guān)鍵詞］ 閉口鋼混凝土組合梁 復(fù)合彎扭 試驗(yàn)分析
Experimental Study on Composite Steelconcrete Beams with Box Sections Under Combined Bending and Torsion/Hu Shaowei1,Nie Jianguo2(1 Nanjing Hydraulic Research Institute，Nanjing 210029,China; 2 Dapartment of Civil Engineering,Tsinghua University,Beijing 100084,China)
Abstract:In order to investigate the behavior of composite steelconcrete beam with box sections under combined bending and torsion，six specimens are tested.Based on different  bendingtorsion ratios，the experimental results，including loading behaviors，failure modes，cracking behavior and stress development are analyzed in detail.The reasons why its ultimate torsion and ultimate bending becomes increase when composite steelconcrete beam with box sections are loaded under combined bending and torsion,are found out.Both its tensional failure and bending failure are compared and analyzed.The current bendingsheartorsion relativity equation is unreasonable.Then，the interaction equations of composite beams subjected to flexure combined with torsion and to flexure combined with shear and torsion are given respectively.Finally,many valuable conclusions are gotten and can be used in design and analysis practice of composite steelconcrete beam with box sections.
Keywords:composite steelconcrete beam;box sections；combined flexure;torsion