郑州龙湖鼎形斜拉桥设计与分析

Design and Analysis of Tripod-shaped Cable-stayed Bridge on Longhu Lake in Zhengzhou

摘要:

以郑州龙湖鼎形斜拉桥为背景，对桥梁的方案构思、桥塔造型和总体结构设计等进行了详细介绍；并采用MIDAS CIVIL软件空间杆系有限元的方法，对桥梁结构在施工状态和运营状态进行了静力计算分析，同时针对斜拉桥4种不同的荷载作用工况进行了整体稳定性分析。结果表明：桥梁总体造型美观，结构设计合理，桥塔和主梁静力验算结果满足设计要求；桥梁结构的第一阶失稳模态对应的稳定安全系数为30左右，整体稳定性满足要求，且失稳模态主要表现为桥塔横向面外失稳。

Abstract:

As the background of the tripod-shaped cable-stayed bridge on Longhu Lake in Zhengzhou, the scheme conception, pylon modeling and overall structure design of the bridge are introduced in detail. The static calculation and analysis of the bridge structure in the construction state and operation state are carried out by using the finite element method of spatial bar system of Midas Civil software. At the same time, the overall stability of the cable-stayed bridge under four different load conditions is analyzed. The results show that the overall shape of the bridge is beautiful, the structure design is reasonable, and the static checking calculation results of the bridge pylon and the main beam meet the design requirements. The stability safety factor corresponding to the first-order instability mode of the bridge structure is about 30, and the overall stability meets the requirements. The instability mode is mainly manifested as the lateral out-of-plane instability of the bridge pylon.