Analysis of Mechanical Property of Steel-UHPC Composite Girder Cable-Stayed Bridge When Raising Elevation of Auxiliary Piers to Improve Loading Condition at Negative Bending Moment Zone

被引：0

作者：

Li L. ^{[1
]}

Zhang G. ^{[2
]}

机构：

[1] School of Transportation Engineering, Shandong Jianzhu University, Jinan

[2] Shandong Road and Bridge Group Co., Ltd., Jinan

来源：

Bridge Construction | 2024年 / 54卷 / 02期

基金：

中国国家自然科学基金;

关键词：

alignment of completed bridge; cable length in stress-free state; cable-stayed bridge; finite element method; mechanical property; raising auxiliary pier; steel-UHPC composite girder;

D O I：

10.20051/j.issn.1003-4722.2024.02.009

中图分类号：

学科分类号：

摘要：

This paper studies the approach to alleviate the negative bending moments in the long-span steel-UHPC composite girder cable-stayed bridge. The main bridge of Huanghe River Bridge carrying a section of the Zhanhua-Linyi Expressway that has a main span of 442 m is used as a case. The 3D finite element model of the bridge was developed in MIDAS Civil to calculate the stay cable lengths in stress-free state and the alignment of the steel-UHPC composite girder after the completion of the bridge. Based on the calculations, the variations of the parameters, including bending moment, stresses in girder soffit, and stresses in the top(bottom) edges of the UHPC panels, were checked when the auxiliary piers were raised during construction. It is shown that raising the auxiliary piers can alleviate or eliminate the negative bending moments in the composite girder at the auxiliary piers, and significantly enlarge the compressive stress margin of the UHPC panels in the negative bending moment zone, which achieves the similar effect of adding prestressing tendons, as a result, the mechanical property of the steel-UHPC composite girder in the negative bending moment zone is remarkably improved. © 2024 Wuhan Bridge Media Co., Ltd., MBEC. All rights reserved.

引用

页码：64 / 69

页数：5

共 15 条

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