劲性骨架混凝土拱桥施工稳定性分析

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发布时间：2021-09-27

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劲性骨架混凝土拱桥施工稳定性分析
王业飞，蔡金标，杨国静
(1．中铁二院工程集团有限责任公司，四川成都 610031；2．浙江大学土木工程系，浙江杭州 310027)
摘要：天工大桥主桥为一座劲性骨架钢筋混凝土拱桥。为了研究该桥施工阶段的稳定性和
风荷载、预应力对稳定系数的影响，通过建立以实体单元 +梁单元为主的 ANSYS三维有限元模
型，模拟施工过程中钢管混凝土截面和混凝土箱形截面的分次浇筑过程。根据计算结果可知：该桥
在施工过程中的稳定系数均大于 4，满足规范要求；风荷栽在拱肋截面分期浇筑成形阶段对稳定系
数影响较大，因此，根据计算结果增设临时横撑；纵、横向预应力对稳定系数的影响均较小，分析时
可考虑纵向系杆力，忽略横向预应力。
关键词：拱桥；劲性骨架；桥梁施工；有限元法；稳定分析
中图分类号：U448．22 文献标志码：A
Analysis of Stability of Steel—Fram e Reinforced
Concrete Arch Bridge at Construction Stage
WANG Ye—fei ，CAIJin—biao ，YANG Guo—ring
(1．China Railway Tieeryuan Engineering Group Co．，Ltd．，Chengdu 610031，China；2．De—
partment of Civil Engineering，Zhejiang University，Hangzhou 310027，China)
Abstract：The m ain bridge of the Tiangong Bridge is a steel—frame reinforced concrete arch
bridge．To study the stability，wind load and influence of prestressing on the stability factors of
the bridge at construction stage， the three—dim ensional finite element model of AN SYS m ainly
used with solid and beam elements was established and the concreting of the concrete—filled steel
tube sections and concrete box sections of the bridge n times in the construction process was sim—
ulated． It is known from the results of calculation that the stability factors in the construction
process are aIi greater than 4 which can meet the requirem ents in the relevant codes． The wind
load at the stage of concreting of the arch rib sections in phases has considerable influence on the
stability factors and the tem porary lateral bracings are hence added in order to resist the wind load
in accordance with the calculation． The Iongitudinal and transverse prestressing does not have
much influence on the stability factors and in the analysis，the longitudinal tied m em ber force can
be considered while the transverse prestressing m ay be neglected。
Key words：arch bridge；steel—fram e；bridge construction；finite elem ent method；stability a—