【摘要】 考虑结构的材料非线性和几何非线性,通过对协作体系金马大桥进行全过程非线性分析,得到了结构的极限承载力。研究了混凝土收缩徐变、加劲梁配筋率、斜拉索的安全系数、加载方式等因素对协作体系桥梁的极限承载力的影响,结果表明斜拉索的设计安全系数是很重要的影响因素,应加以重视;全桥和半桥加载时,弹塑性极限活荷载安全系数分别为21.4和9.67,表明金马大桥这种协作体系具有良好的极限承载能力;其弹塑性极限承载力远小于弹性极限承载力,研究结果可以为同类桥梁工程的设计和计算提供参考。更多还原

【Abstract】 Based on nonlinear full-range analysis,considering both geometrical and material nonlinearity,ultimate load-carrying capacity of cooperated system is calculated.The study on effects of the concrete shrinkage and creep,the ratio of reinforcement of stiffening girder,the safty coefficients of cable and restraint of bearing on ultimate load-carrying capacity of the structure indicates that the elastic ultimate load-carrying capacity is much greater than the elastic-plastic one,and the attention should be paid to selection of the safety coefficient of the cable.Furthermore it is found that for the condition of loading on the entire bridge and half bridge,the safety coefficients of ultimate bearing capacity of Jinma bridges are respectively 21.40 and 9.67,which means that the ultimate bearing capacity of cooperated system is very fine.Some conclusions are given which will be helpful to the preliminary design and construction of the similar bridge.更多还原