摘要
为探讨多跨悬索桥主塔初步设计简化方法,基于挠度理论,将桥梁荷载转化为作用于塔顶的水平力和竖向力,并采用等效弹簧来模拟主缆对桥塔的约束作用,推导了考虑倾角变化的主缆约束刚度解析表达式,提出一种多跨悬索桥主塔初步设计方法。为验证该方法的正确性,建立多跨悬索桥有限元模型,对比分析了用2种方法计算的主塔位移和弯矩,发现其结果的吻合度较高。这表明该方法可用于悬索桥主塔的初步设计,为悬索桥的设计提供了一种简化的计算工具。
To investigate themulti span suspension bridgemain tower preliminary design of simplified method,the bridge load is transformed into the horizontal force and vert- cal force acting on the top of the tower,based on the deflection theory. And the equiva-lent spring to simulate the constraint effect on main cable pylon,an analytical expres-sion for the cons traint stiffness of the main cable considering the change of the inclina-tion angle is derived. The preliminary design method of a multispan suspension bridge main tower is put forward. In order to verify the correctness of the method, the finite element model of multispan suspension bridge is established. The two calculation meth-ods are compared and analyzed. The results show that the method can be used in preliminary design of the main tower of suspension bridge.The method provides a sim-plified calculation tool for the design of suspension bridges.
出处
《交通科学与工程》
2017年第1期46-49,71,共5页
Journal of Transport Science and Engineering
关键词
多跨悬索桥
主塔
初步设计
有限元
multi-span suspension bridge
main tower
preliminary design
finite element
