【摘要】 为了探讨和验证无背索斜塔斜拉桥的设计理论和实际工作性能,对其进行了静动力荷载试验,并结合三维有限元模型的理论计算,对比分析了试验荷载工况下该桥位移、应力和索力的变化规律以及模态频率、阻尼比和冲击系数等结构动力特性,探讨了13 m长悬臂钢-混凝土组合梁结构的扭转性能。研究结果表明:桥梁结构动静力实测值与理论值吻合良好,桥梁整体工作性能好;扭转工况下,组合梁端部上下游位移差较大,抗扭刚度相对较低;结构前两阶阻尼比较大,对振动有较好的衰减作用;荷载试验验证了分析理论的正确性和施工技术的可靠性,可为同类桥梁的设计提供参考。更多还原

【Abstract】 This paper presents a field load testing and analytical modeling for the inclined tower cable-stayed bridge without back-stays to evaluate its design theory and structural behavior.The test results are compared with the calculating results of 3D finite element model,including the static behavior,the stress and deformation of the girder and bridge tower,cable forces,and the dynamic behavior,the structural frequency,damping ratio and impact coefficient.The torsional properties of the box girder with 13-meter-long steel-concrete composite cantilevers are analyzed.The results show that the measured values agree well with the calculating ones,while at the twisting working condition the deformation of two sides of the box girder had much difference,which means the relatively lower torsional stiffness.On the other hand,the measured damping ratio of the bridge,whose girder has long steel-concrete composite cantilevers,is larger than others,which means a better anti-vibration performance.The results mentioned above verify the design theory and construction method,and also provide reference for the design of the same type bridge.3 tabs,10 figs,11 refs.更多还原