基于拟水平正交试验法的大跨连续梁桥冲击系数计算研究
Research on Calculation of Impact Coefficient of Long-span Continuous Beam Bridge Based on Quasi Horizontal Orthogonal Test Method
李华腾 1张冰辰 2张驿丹 1谢先和 1申林3
作者信息
- 1. 太原科技大学 车辆与交通工程学院,山西 太原 030024
- 2. 山西应用科技学院 动力与电气工程学院,山西 太原 030000
- 3. 中路高科交通检测检验认证有限公司,北京 100088
- 折叠
摘要
大跨连续梁桥因其线性流畅、适应性强等特征,在我国公路建设中广泛应用.近年来,随着交通特征逐渐快速化、重载化,车桥耦合振动问题不容小觑.为研究重载车辆作用下桥梁冲击系数变化规律,基于车桥耦合振动理论,考虑桥面不平度、行车速度、车辆载重、桥梁阻尼比、车辆悬架刚度和车辆悬架阻尼 6 个参数的影响,然后利用正交试验法设计 25 种试验工况,逐步回归得到大跨连续梁桥冲击系数计算公式.研究结果表明:对挠度冲击系数影响较为显著的参数有:桥面不平度、车辆悬架刚度、车辆载重;对弯矩冲击系数,桥面不平度这一参数影响最大.挠度冲击系数、弯矩冲击系数的相关系数分别为 0.896、0.856,回归模型拟合度良好.试验结果可为相关规范中大跨连续梁桥冲击系数的修订提供参考.
Abstract
Long-span continuous beam bridges are widely used in highway construction in Chi-na because of their elegant lines and strong adaptability.With the increase of highway traffic load,coupled vibration of axles has become a problem to be reckoned with in recent years.This study focuses on the change law of bridge impact coefficient under the action of heavy-duty vehi-cles,based on the coupling vibration theory of axles.The influences of six parameters were con-sidered,including bridge deck unevenness,driving speed,vehicle load,bridge damping ratio,ve-hicle suspension stiffness and vehicle suspension damping.Altogether 25 test conditions were de-signed with the orthogonal test method,and the calculation formula of impact coefficient of long-span continuous beam bridge was obtained step by step.The results show that the parameters that significantly influence the impact coefficient of deflection are:bridge deck unevenness,vehi-cle suspension stiffness,and vehicle load;bridge deck unevenness has the greatest influence on the parameters of bending moment impact coefficient.The correlation coefficients of deflection impact coefficient and bending moment impact coefficient are 0.896 and 0.856,respectively,and the regression model fits well.The test results provide a reference for the revision of the impact coefficient of long-span continuous beam bridges in relevant specifications.
关键词
大跨连续梁桥/拟水平正交试验法/冲击系数/回归方程Key words
long-span continuous beam bridge/intended level orthogonal test method/impact coefficient/regression equation引用本文复制引用
基金项目
山西省基础研究计划青年科学研究项目(202203021212306)
太原科技大学教学改革项目(JG202274)
企业自主研发项目(0202E521088300)
太原科技大学大学生创新训练项目(XJ2022085)
出版年
2024
NETL
NSTL
维普
万方数据