摘要
为了探讨和验证独塔斜拉桥的设计理论和实际工作性能,通过对天津某大桥的静动力荷载试验,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。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;承载力满足设计要求,斜拉索索力分布均匀,安全系数符合规范规定。结构冲击系数可按照现行规范取值。荷载试验验证了分析理论的正确性和设计的可靠性,为将来桥梁养护、维修提供了必要的技术资料。
In order to discusses and validate the design theory and the practical working performance of single-pylon cable-stayed bridge, according to the static and dynamic load tests of a bridge in Tianjin and combined with the theoretical calculation of 3D finite element model, the article compares and analyzes the displacement and stress of this bridge, variable law and modal frequency of cable force, damping ratio and impact factors, and the other structural dynamic characteristics. The result shows that the static and dynamic measures values of bridge structure is good agreed with the theoretical value, the integral working performance of bridge is good, the carrying capacity can satisfy the design requirements, the distribution of stayed cable force is even, and the safety coefficient conforms to the specifications. The structural impact coefficient can be valued according to the current standard. The load test validates the correctness of analysis theory and the reliability of design, which provides the necessary technical information of maintaining the bridges.
出处
《城市道桥与防洪》
2016年第8期117-120,139,共5页
Urban Roads Bridges & Flood Control
关键词
桥梁工程
荷载试验
斜拉桥
动力性能
有限元分析
bridge engineering
load test
cable-stayed bridge
dynamic performance
finite element analysis
