摘要
根据设计文件和施工布置,某跨度为220 m的下承式钢管混凝土拱桥的钢管拱肋原位拼装架设方法为支架法,由于支架法对施工条件要求较高,目前支架法架设大跨度拱桥桥肋的原位拼装工程实例较为少见。为了保证拱肋施工支架的安全性和稳定性,本文基于有限元软件MIDAS-Civil建立三维有限元模型,对其最不利受力状态下的空间稳定性和静力进行了分析,分别计算了支架在横桥向风荷载和自重作用下的位移、应力和弹性稳定系数。计算结果表明,支架的刚度、强度及稳定性均满足设计和规范要求,横桥向风荷载对支架的稳定性影响较小,拱肋和支架的自重为支架横向稳定性的控制荷载。
According to the design documents and construction layout,the insitu erection and erection method of steel tube arch ribs of a 220 mspan concrete-filled steel tube arch bridge is the bracket method.Because the bracket method requires stricter construction conditions,At present,there are few examples of insitu erection of long span arch bridge ribs by bracket method.In order to ensure the safety and stability of the arch rib construction support,this paper establishes a three-dimensional finite element model based on the finite element software MIDAS-Civil,analyzes its spatial stability and static force under the most unfavorable stress state,and calculates the displacement,stress and elastic stability coefficient of the support under the transverse bridge wind load and dead weight respectively.The calculation results show that the stiffness,strength and stability of the support meet the design and specification requirements,the lateral wind load has little effect on the stability of the support,and the self-weight of the arch rib and the support is the control load for the lateral stability of the support.
作者
汪德旺
WANG Dewang(Honghu Highway Administration of Hubei Province,Jingzhou 433200,China)
出处
《贵州大学学报（自然科学版）》
2021年第6期104-108,共5页
Journal of Guizhou University:Natural Sciences
基金
湖北省交通运输厅资助项目(2017-395-02)。
关键词
拱桥
桥梁施工
有限元分析
拱桥桥肋
arch bridge
bridge construction
finite element analysis
arch bridge rib
