基于数值仿真的多跨连续梁桥可行性评估研究

Feasibility Evaluation of Multi-span Continuous Beam Bridges Based on Numerical Simulation

为提高公路桥梁的建设水平,以G346国道路网三跨连续梁桥工程为研究对象,在总结项目概况的基础上,采用四阶段法评估该桥的交通量。基于预测交通量,利用有限元软件,解析主梁梁高对结构设计安全系数的影响规律,研究最佳梁高。开展纵横向有限元仿真数值分析,从多个角度综合评估桥梁结构的合理性。结果表明,项目建成初期,交通量增长相对较快(增长率为18.98%),运营后期交通量增长速度逐渐放缓;桥梁承载力和设计弯矩均随主梁高度增加而增加,本桥推荐梁高为2.0 m;桥梁承载能力极限状态和正常使用极限状态均满足规范要求。研究成果可为此类结构提供参考。

To improve the construction level of highway bridges,the G346 national road network three span continuous beam bridge project was taken as the research object.Based on the summary of the project overview,the traffic volume of the bridge was evaluated using the four stage method.Based on the predicted traffic volume,the influence law of main beam height on the safety factor of structural design was studied with finite element software,and the optimal beam height is discovered.Conduct longitudinal and transverse finite element simulation numerical analysis to comprehensively evaluate the rationality of bridge structures from multiple perspectives.The results show that in the early stages of project construction,the traffic volume grew relatively fast(with a growth rate of 18.98%),but the growth rate of traffic volume gradually slowed down in the later stages of operation.The bearing capacity and design bending moment of the bridge increase with the increase of the main beam height,and the recommended beam height for this bridge is 2.0 m.Both the limit state of bridge bearing capacity and the limit state of normal use meet the requirements of the specifications.The research results can provide reference for such structures.