Based on the overturn of Gangtang interchange A-ramp bridge in Tianjin-Shanxi Highway on July 15,2009,and combined with the characteristics of Hebei section in Qingdap-Yinchuan Highway,two single -column curved single-cell single-box rigid frame bridges of Yong'an grade separation are studied in this paper. Supported by the finite element analysis software ANSYS and the model test,the mechanical property of the bridge is studied under the multiple load cases. The stress and displacement distribution of each control section under each load case is obtained. The most unfavorable position of wheel and tonnage series of vehicle are ensured. The ultimate load which probably leads to the overturn of C-ramp single-column curved bridge in Qingdao-Yinchuan Highway is ensured. The suggestion that how to avoid the accident of this kind of the bridge is proposed to permanently solve the vehicle overturn,and the reinforcement scheme is proposed.%以2009年7月15日津晋高速公路港塘互通立交A匝道桥发生的桥梁倒塌事故为镜鉴,结合青银高速公路河北段自身的特点,确定出以永安立交两座独柱支承连续曲线混凝土单箱单室箱梁刚构桥作为主要的研究对象.并以有限元理论分析为基础,利用Ansys多工况仿真技术,辅以模型试验加以验证的方法,研究独柱曲线连续梁桥的力学性能.得出桥梁在各荷载工况作用下各个控制断面的应力及位移分布情况,并确定出车辆荷载最不利轮位及车辆吨位级数,获得了青银高速公路C匝道独柱混凝土曲线箱梁桥可能发生倾覆的极端荷载布置形式,提出现阶段避免此类桥型发生桥梁事故的建议,并为永久解决该桥的车辆荷载倾覆问题提出了加固方案.
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