Analysis on ultimate load-carrying capacity and failure modes of long-span cable-stayed bridges with floating systems under the action of vertical loads

被引：0

作者：

Lü W.-G. ^{[1
,2
]}

He Z. ^{[2
]}

机构：

[1] School of Civil Engineering, Guizhou Minzu University, Guiyang

[2] School of Civil Engineering, Dalian University of Technology, Dalian

来源：

Gongcheng Lixue/Engineering Mechanics | 2022年 / 39卷 / 05期

关键词：

Cable corrosion; Cable-stayed bridges with floating systems; Linear programming; Plastic limit analysis; Ultimate load-carrying capacity and failure modes;

D O I：

10.6052/j.issn.1000-4750.2021.03.0159

中图分类号：

学科分类号：

摘要：

The plastic limit analysis method is proposed to study the ultimate load-carrying capacity and failure modes of long-span cable-stayed bridges with floating systems under the action of vertical loads. Based on the assumptions of the plastic limit analysis and on the elementary mechanisms, the feasibility of the method applied to the failure analysis of cable-stayed bridges was proved. Combined with a single-tower cable-stayed bridge with a floating system, the calculation formula of ultimate load-carrying capacity was derived and the corresponding failure modes are analyzed. The plastic collapse loads and the corresponding failure modes of the cable-stayed bridges were obtained through the interior point method which is an optimization method, and then the comparison analysis of two results respectively from the plastic limit analysis method and the OpenSEES were conducted. The results show that: the girder of cable-stayed bridges subjected to vertical loads presents the characteristic of global failure when the cable's yield strength is relatively small, otherwise it presents the characteristics of local failure. The influence of the girder's yield strength on the failure behavior is just the opposite of those cables. The cable corrosion not only reduces the ultimate load factor of the cable-stayed bridges, but also changes its failure modes. Compared with the FEM, the plastic limit analysis method is simple and easy to operate. It can be used to study the ultimate load-carrying capacity and failure modes of cable-stayed bridges subjected to vertical loads and can quickly and effectively evaluate the influence of changes of structural parameters on the failure behavior of bridges. Copyright ©2022 Engineering Mechanics. All rights reserved.

引用

页码：145 / 158

页数：13

共 45 条

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