考虑实际偏位的薄壁高墩桥梁力学性能分析  

Mechanical Performance Analysis of Thin-whalled High Pier Bridges Considering Actual Displacement

作　　者：王思锐 WANG Sirui(Shaanxi Transportation Holding Group Co.,Ltd.,Xi’an 710065,China)

机构地区：[1]陕西交通控股集团有限公司,西安710065

出　　处：《现代交通技术》2025年第1期28-32,共5页Modern Transportation Technology

摘　　要：根据施工过程中的实测桥墩偏位情况,利用midas Civil软件建立桥梁结构和偏位较大桥墩的有限元模型,并考虑偏位情况对桥墩的受力性能和稳定性的影响,分析桥梁结构的受力性能。结果表明,薄壁高墩在偏位5~10 cm时,对桥墩的受力和稳定性影响较小;施工期间实测桥墩偏位对静定桥梁结构的受力性能基本无影响;若偏位发生在成桥阶段,对主梁受力影响较大,最大拉应力增加1.25 MPa,最大压应力增加1.98 MPa;10年收缩徐变与桥墩偏位对桥梁结构的力学特性影响相对独立;桥墩偏位对主梁高阶自振频率有一定影响,对低阶自振频率无影响。Based on the measured displacement of bridge piers during the construction process,a finite element model of the bridge structure and the large bridge piers with displacement was established using midas Civil software.The influence of dis-placement on the stress performance and stability of the bridge piers was considered,and the stress performance of the bridge structure was analyzed.The results show that the deflection of the thin-walled high pier within the range of 5~10 cm has little effect on the stress and stability of the pier.The measured deflection of piers during construction has little effect on the mechanical performance of statically determined bridge structures.If the deflection occurs in the bridge comple-tion stage,it will have a great impact on the stress of the main beam,with the maximum tensile stress increased by 1.25 MPa and the maximum compressive stress increased by 1.98 MPa.The effects of 10-year shrinkage and creep and pier deflection on the stress of the bridge structure are independent of each other.Pier deflection has certain influence on the high order natural frequency of the main beam,but has no influence on the low order natural frequency.

关 键 词：山区桥梁 薄壁高墩 稳定性 动力特性 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]