摘要
针对新型组合箱梁受腹板褶皱效应的影响,力学特性发生较大变化的问题,采用模型试验和数值模拟的方法对这一现象进行研究。通过制作模型试验梁,并测试其一阶竖向振动频率和在不同荷载作用下跨中翼板应力值,建立ANSYS有限元模型对试验值进行验证;运用有限元软件分析高跨比、波纹腹板厚度和波折角对组合箱梁动力特性的影响。研究结果表明:模型试验值与有限元解吻合良好,褶皱效应对组合箱梁下翼板的应力影响最大,达到15%~21%左右;增大腹板厚度能有效提高组合箱梁总体刚度;增大腹板波折角对结构竖向和横向振动频率影响较小,但对其扭转振动频率影响较大;组合箱梁扭转振动频率的增大幅度随其高度的增加逐渐减小。
The mechanical properties of the composite box girder have undergone great changes due to the influence of the webs fold effect.This paper used model test and numerical simulation to study this phenomenon.The model test beam was fabricated,tested the first-order vertical vibration frequency and the stress value of the mid-span plate under different loads.The ANSYS finite element model was established to verify the test values.The finite element software was used to analyze the influence of high-span ratio,corrugated web thickness and wave-angle angle on the dynamic characteristics of composite box girder.The results show that the model test value is in good agreement with the finite element solution.The fold effect has the greatest influence on the stress of the lower wing of the composite box girder,which is about 15%~21%.Increasing the corrugated web thickness can effectively improve the overall stiffness of the composite box girder;Increasing the web corner angle has little effect on the vertical and lateral vibration frequencies of the structure,but it has a great influence on the torsional vibration frequency.Increasing the combined beam height will reduce the influence of the fold effect on the torsional vibration.The increase amplitude of the torsional vibration frequency of the composite box girder decreases with the increase of its height.
作者
张紫辰
王根会
ZHANG Zichen;WANG Genhui(Lanzhou Jiaotong University,Key Laboratory of Road&Bridge and Underground Engineering of Gansu Province,Lanzhou 730070,China;School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《铁道科学与工程学报》
CAS
CSCD
北大核心
2019年第10期2491-2496,共6页
Journal of Railway Science and Engineering
基金
国家自然科学基金资助项目(51368035)
甘肃省交通厅项目(2016-34)
关键词
组合箱梁
褶皱效应
模型试验
有限元
动力特性
composite box girders
fold effect
model test
finite element
dynamic characteristic
作者简介
通信作者:王根会(1962-),男,陕西礼泉人,教授,博士,从事桥梁结构理论、桥梁健康诊断方面研究,E-mail:wahl@mail.lzjtu.cn。
