曲线现浇箱梁非对称恒载对桥梁动静力响应影响的量化研究  

Quantitative Study on the Influence of Asymmetric Dead Load on Dynamic and Static Responses of Bridges with Curved Cast-in-Place Box Girders

作　　者：杨秀涛 YANG Xiutao(Henan Communications Planning&Design Institute Co.Ltd.,Zhengzhou 450018,China)

机构地区：[1]河南省中工设计研究院集团股份有限公司,郑州450018

出　　处：《河南科学》2024年第7期1003-1010,共8页Henan Science

基　　金：河南省交通运输厅科技项目(2020J9)。

摘　　要：为量化研究曲线现浇箱梁非对称恒载对桥梁动静力响应的影响,首先推导了非对称恒载偏心扭矩的计算,然后选取常规跨径16、20、30、40m及平面曲线半径30、50、100、200m,建立12组等高三跨现浇连续箱梁桥为研究样本.基于Python语言建模、MIDAS/Civil软件进行有限元分析,研究考虑非对称恒载扭矩与否两种情况对曲线现浇箱梁桥支座反力、主梁应力和下部结构内力的影响.结果表明,非对称恒载扭矩引起支座反力外大内小、影响显著且边墩反力受影响程度大于中墩;当桥梁平面曲线半径为30m内时,非对称恒载对曲线箱梁桥梁体应力影响显著,半径达100m后可不考虑非对称恒载对梁体应力的影响;非对称恒载对桥墩安全度的影响极为有限,地震作用下桥墩承载力计算可不予考虑.A quantitative analysis was conducted to assess the impact of asymmetric dead load on the dynamic and static responses of curved cast-in-place box girders,focusing on deriving the calculation of eccentric torque under such loads.The study focused on ramp bridges with conventional spans as the research subject,employing Python for modeling and MIDAS/Civil for finite element analysis.The study involved 24 groups of three-span cast-in-place continuous box girder bridges of equal height.These bridges had conventional spans of 16 m,20 m,30 m,and 40 m,and were used as research samples with plane curve radii of 30 m,50 m,100 m,and 200 m.The study investigated the impact of asymmetric dead load torque on support reactions,main beam stress,and substructure internal forces in curved cast-in-place box girder bridges.The findings indicate that asymmetric dead load torque significantly increases external forces and decreases internal forces at supports,with side pier reactions more affected than middle pier reactions.For bridge curve radii up to 30 m,asymmetric dead load significantly impacts the stress in curved box girder bridge structures.Beyond a radius of 100 m,the impact of asymmetric dead load on beam stress can be disregarded.The influence of asymmetric dead loads on bridge pier safety is minimal,and calculations of bridge pier bearing capacity under earthquake conditions may be disregarded.

关 键 词：量化研究 曲线梁桥 非对称恒载 Pyhton 有限元分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]