【作者】 徐元；

【导师】 陈忠汉；

【作者基本信息】 苏州科技学院 ， 结构工程， 2007， 硕士

【摘要】 组合梁由于其良好的整体性能和经济效益，在目前的建筑及桥梁结构领域得到了广泛的应用。界面滑移效应使其挠度增大，而在工程设计中，组合梁的挠度验算是主要矛盾，由此带来的设计问题因而也成为了关注的热点。当前组合梁挠度计算方法还有待改进，对于连接程度和挠度之间的直接影响关系没有精确的分析，影响组合梁挠度的具有明确物理意义的关键参数亦未有定论，而找出这个关键参数对组合梁考虑滑移效应下变形规律的深入研究有很大的益处。本论文从组合梁基本原理入手，演绎了力学基本微分方程的建立、求解全过程，得出在三种荷载情况下微分方程的解析解；进而经由曲率方程直接二次积分给出了在三种荷载下的组合梁理论位移计算公式，和国内少数文献相比更为严格、简练，有现实意义；在此基础上采用数值分析和数据拟合的方法，选定合适的自变量，提出了考虑界面滑移的组合梁截面刚度修正系数的表达式，该表达式顺应设计者习惯、简单明了、物理意义明确并能满足设计精度的要求，同时还探讨了影响组合梁挠度的主要参数；针对部分抗剪连接组合梁，提出了挠度增大系数的表达式，形式直观、计算简便，基本满足工程设计精度要求，同时它还给出了某一根组合梁按不同连接程度来设计时其挠度的变化全过程规律，视野很宽，对设计者有启示效果；最后以观察试件的受力和变形全过程、理解构件的破坏机理及验证基本理论假设和所提公式为目的，本文还进行了不同形式的钢—混凝土组合梁的试验研究，测试内容包括应变、滑移、挠度及特征荷载等，试验结果与本文理论分析结果基本吻合，同时累积的一些试验资料也为进一步的理论建设打下了基础。更多还原

【Abstract】 Because of good behaviors and economic performance, the steel-concrete composite beams are widely used in architecture and bridge structure field. On account of the slips in the interface, the deflection of the beams increases notably. At the same time, the check of deflection is an important factor which need to be considered in composite beams design. So, the accurate calculation of the composite beams’ deflection become a little bit hot problem. At present, the calculation method predicting the deflection of simply supported steel-concrete composite beams still need to improve; there isn’t accurate analysis of relationship between the connection degree and the deflection; the key parameter reflecting the structural mechanism of the deflection doesn’t have a hard conclusion.Based on the basic principle, this paper deduced the whole proeesseses that the mechanics basic differential equation build up and solve, found out analytical solution of the equation under three kinds of load; though two direct integral calculuses of the curvature differential equation, this paper deduced theories formulas of the displacement to composite beams, which is more strict and refinement compared with a handful of local literature and has realistic meaning; then made selection suitable independent variable factor, deduced the formula expressing the reduced stiffness ratio considering slip effect by numerical analysis and fitting data, which is of simple form, and can reflect the structural mechanism for composite steel-concrete girders with partial shear connection, show the adequate accuracy, moreover the key parametric analys of deflection is performed; aim at the beams with partial shear connection, the formula expressing the increased deflection which is simplified and fulfil accuracy requirements is put forward, furthermore it shows the regulation of deflection variety with variety of connection degree and the effect of the apocalypse for design; finally, to observe the whole beating capacity and deflection processeses of pieces, comprehend destructive mechanism, and validate the correctness of the theories and formulas in this paper, the experimental analysis under static concentrate lateral loads were presented, which agree beter with the results of investigations from in the paper, include strain、slip、deflection and characteristic loads etc, moreover these experiment information have a well guideline to further theoretical analysis too.更多还原