自锚式悬索-斜拉协作体系桥梁主缆锚固区空间受力分析

Analysis on Spatial Force of Main Cable Anchorage Zone of Bridge with Self-anchored Suspension Cable-Cable-stayed Cooperative System

摘要:

主缆锚固区作为自锚式悬索-斜拉协作体系桥梁的关键结构，承担着将巨大的主缆轴力均匀传递到加劲梁全截面的重要作用。为研究主缆锚固区的受力状况和主缆力的传递规律，以60 m航空限高条件下主跨420 m自锚式悬索斜拉协作体系桥梁方案为背景，建立板壳-实体有限元模型，对大跨度自锚式协作体系桥主缆锚固区各板件进行空间受力分析，得出锚固区主要板件受力的应力水平和分布情况，以及锚体中混凝土对锚固区板件应力的影响作用，对主缆锚固区结构设计的合理性和安全性进行了验证。

Abstract:

The main cable anchorage zone, as a critical component in self-anchored suspension cable - cable-stayed cooperative system bridge, is responsible for uniformly distributing the significant axial forces of the main cables to the entire cross-section of the stiffening girder. In order to study the force condition of anchorage zone of the main cable and the force transfer rule of the main cable, and based on the scheme of the self-anchored suspension cable - cable-stayed cooperative system bridge with the main span 420 m on the condition of 60 m air-mail height limit, a shell-solid finite element model is established to analyze the spatial force of each component in the anchorage zone of the main cable for the long-span self-anchorage cooperative system bridge. The stress level and distribution condition of each component in the anchorage zone are given, and the influence of the concrete in anchor on the stress of component in the anchorage zone is obtained. The rationality and safety of the structural design in the anchorage zone of the main cable are verified.