钢管混凝土拱桥拱肋水化热温度场和温度应力分析

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发布时间：2021-12-02

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常山南门溪大桥为钢管混凝土提篮拱桥，拱肋施工正处于冬季，针对该桥拱肋采用集
束式钢管混凝土结构，截面混凝土所占比例较大，钢管又相对薄弱的情况，采用 LUSAs通用有限
元软件，分析拱肋混凝土水化热，对拱肋水化热产生的温度场及温度应力进行计算。分析表明：冬
季施工拱肋混凝土水化热引起的温度梯度大，温度应力明显，在施工与监控过程中应考虑其影响。
关键词：拱桥；钢管混凝土结构；拱肋；水化热；温度场；温度应力
中图分类号：U448．22 文献标志码：A
Analysis of Temperature Field and Stress of Concrete Hydration
Heat of Arch Ribs of a Concrete-Filled Steel Tube Arch Bridge
XUAN Ji—ming，
(College of Architecture and Civil Engineering，
XlA NG Hua-wei
Zhejiang University of
， LU K e—qi
Technology，Hangzhou 310014，China)
Abstract：The Nanmen Creek Bridge in Changshan is a concrete—filled steel tube (CFST)bas—
ket handle arch bridge and the construction of the arch ribs of the bridge was right in the winter
season． In the light of the characteristics that the clustering type CFST structures were chosen
for the arch ribs of the bridge，the concrete accounted for a large proportion in the sectional area
of an arch rib and the steel tubes were relatively weak，the universal LU SAS software was used
tO conduct the analysis of hydration heat of the concrete and the tem perature field and tempera—
ture stress arising from the hydration heat were calculated．The results of the analysis indicated
that the tem perature gradient due to the concrete hydration heat of the arch ribs constructed in
the winter season was great and the tem perature stress was significant．The influence of the tem—
perature gradient and stress should be thus considered in the construction process and in the con—
struction monitoring and contro1．
Key words：arch bridge；concrete—filled steel tube structure；arch rib；hydration heat；tem—
perature field；temperature stress
1 引言
近年来钢管混凝土拱桥在桥梁建设中获得了广
泛运用与发展，但这种结构还有很多问题有待进一
步深入研究，拱肋水化热温度场便是其中之一 ]。
钢管混凝土拱桥拱肋截面形式多样，文献[2]针对圆
形及方形拱肋截面进行了水化热温度场实测及有限
元计算分析；文献[3]则对哑铃形截面水化热温度场
进行了有限元分析计算。2篇文献均未涉及水化热
引起的不均匀温度场产生的温度应力计算，钢管内
受约束的混凝土升温膨胀必引起钢管应力，有关应
力度的研究还较少。实际工程中拱肋截面形式多
样，钢管应力备受关注，在工程实践快速进行的同
时，这方面的研究有待跟进。本文以浙江常山南门
溪大桥的施工监控为工程背景，对其拱肋水化热温