陈丽华¹  娄  宇²  李培彬²  李爱群³
（1 合肥工业大学土木建筑学院 合肥 230009； 2 中国电子工程设计院 北京 100840； 3 东南大学 南京 210096）

[摘要] 为探讨外包钢-混凝土组合梁在负弯矩作用下的工作性能，对两根外包钢-混凝土连续梁试件进行了静力加载试验研究。试验结果表明：外包钢-混凝土组合梁负弯矩区钢筋和外包钢梁通过抗剪连接措施能有效地共同工作，整体工作性能良好。配筋率是影响梁塑性转动能力和弯矩重分布程度的一个重要参数。通过控制配筋率，在承载能力极限状态，外包钢-混凝土组合梁在负弯矩及正弯矩最大截面的塑性变形均充分发展，具有较好的转动能力和延性，能够保证连续梁形成充分的塑性内力重分布。
[关键词] 外包钢-混凝土组合梁；连续梁；配筋率；内力重分布

    Experimental Research on the Internal Moment Redistribution of
    Outer-plated Steel-concrete Continuous Composite Beams
    Chen  Lihua¹,  Lou  Yu², Li Peibin², Li Aiqun³
    (1 College of Civil and Arch Eng,  Hefei University of Technology, Hefei 230009, China;  2 China Electronics Engineering Design Institute, Beijing 100840, China;  3 College of Civil Eng,  Southeast University, Nanjing 210096, China)

Abstract: The outerplated steel-concrete composite beam is a new type of coruposite beam. To evaluate its perfonuance under negative bending ruoment,  static load tests of two beams were conducted. Test results indicated that effective cooperation could be achieved by the shear resistant connection between the reinforcement iIl the negative moment area and the outer plated steel beam, thus favorable entire performance could be achieved. The reinforcement ratio of the steel bars is a main parameter which affects the degree of rotation capability and moment redistribution of plastic hinge. At the loacFbearing limiting state, plastic strain on sections of both the negative and positive ruaxuuLuu ruoruent got fully developed by controlling the parameter of reinforcement ratio, and the continuous composite beams have sufficient plastic rotation ability and ductility to develop full moment redistribution.
Keywords: outer-plated steel-concrete coruposite beam;  continuous beam;  reinforceruent ratio;  moment redistribution