某下承式钢管混凝土拱桥二类稳定分析研究

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发布时间：2021-10-09

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为研究下承式钢管混凝土拱桥二类稳定性问题，以某下承式钢管混凝土拱桥的方案
设计为背景，利用大型分析软件 ANSYS建立 3个全桥有限元模型，其钢管混凝土材料分别采用统
一理论法、组合截面法和双单元法进行模拟；探讨了二类稳定安全系数的评判标准，根据规范提出
了二类稳定安全系数的判定计算方法。计算分析结果表明，统一理论法计算值偏大；组合截面法和
双单元法能比较真实地模拟钢管混凝土材料，拱桥稳定性分析二者计算结果相近；该下承式钢管混
凝土拱桥稳定性有保证。
关键词：拱桥；钢管混凝土结构；稳定性；安全系数；非线性；有限元法
中图分类号：U448．22 文献标志码：A
Analytical Study of Category 2 Stability of a ConcreteFilled Steel Tubular Through Arch Bridge
TAN Guo—hong 。LI Long—an
(China Railway Major Bridge Reconnaissance＆ Design Institute Co．，Ltd．，Wuhan 430056，China)
Abstract：To study the issue of category 2 stability of concrete—filled steel tubular(CFST )
through arch bridges，the conceptual design of a CFST through arch bridge was cited as an exam —
ple and three finite element models for the whole bridge of the bridge were set up by the large
scale analysis software ANSYS． The CFST materials of the models were sim ulated respectively
by the unified theory method，combined section method and dual elements method，the j udgment
criteria for the category 2 stability safety factors were discussed and the calculation m ethods for
j udging the safety factors were proposed in accordance with the relevant codes．The results of the
calculation and analysis demonstrate that the calculation values based on the unified theory m eth—
od are slightly great while the com bined section m ethod and the dual elements m ethod can simu—
late the CFST materials for rea1． H owever，the calculations of these methods in the analysis of
stability of the bridge are close，showing that the stability of the bridge can be guaranteed．
Key words：arch bridge；concrete—filled steel tubular structure；stability；safety factor；non—
linearity；finite elem ent method
1 前言
下承式钢管混凝土拱桥因其经济、美观以及施
工方面的优点在现代桥梁建设中得到了广泛的应
用，该类桥梁的稳定问题一直是人们研究的重点。
拱的稳定从失稳形态上分为面内失稳和面外失
稳，从失稳时的平衡状态可分为分支点失稳和极
值点失稳，从是否考虑材料非线性及几何非线性又
分为线性稳定和非线性稳定。工程中习惯把线性稳