| 引用本文: | 高庆飞,张坤,刘晨光,孙勇,李忠龙.移动车辆荷载作用下桥梁冲击系数的若干讨论[J].哈尔滨工业大学学报,2020,52(3):44.DOI:10.11918/201903144 |
| GAO Qingfei,ZHANG Kun,LIU Chenguang,SUN Yong,LI Zhonglong.Discussions on the impact factor of bridges subjected to moving vehicular loads[J].Journal of Harbin Institute of Technology,2020,52(3):44.DOI:10.11918/201903144 |
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| 摘要: |
| 为对移动车辆荷载作用下桥梁冲击系数有更加深刻的理解,结合理论推导与仿真模拟,并考虑其物理意义,对冲击系数基本概念、不同响应以及不同位置对应冲击系数的区别等关键问题进行了详细讨论. 研究表明:现行规范所采用冲击系数是一个不具有实际物理意义,仅便于设计的中间变量；不同响应冲击系数不相同,且弯矩冲击系数往往小于挠度冲击系数；不同截面对应冲击系数不相等,墩顶冲击系数最大、边跨次之、中跨最小；处于对称位置的截面,车辆后经过的截面冲击系数较大；基于不同的原理,用于设计的冲击系数可采用较为保守的值,而对于评价则不可直接使用. 最后,提出了移动车辆荷载作用下桥梁动力性能设计与评价时冲击系数取值方法的建议. |
| 关键词: 公路桥梁 移动车辆 动力性能 冲击系数 设计方法 评价方法 |
| DOI：10.11918/201903144 |
| 分类号:U441 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51778194)；中国博士后科学基金(2017M621282)；哈尔滨工业大学科研创新基金(2019056)；吉林省交通运输科技计划(2015-1-14) |
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| Discussions on the impact factor of bridges subjected to moving vehicular loads |
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GAO Qingfei,ZHANG Kun,LIU Chenguang,SUN Yong,LI Zhonglong
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(School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150090, China)
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| Abstract: |
| To further understand the impact factor (IF) of bridges under moving vehicular loads, key problems such as the basic concept of IF, IF for different responses and positions were discussed in detail by combining theoretical derivation and numerical simulation and considering the physical significance of IF. Results show that the IF in the current specification was only a median parameter for convenient design, which had no actual physical meanings. IFs of different responses were not the same, and IF of moment was smaller than that of deflection in most cases. Moreover, IF in various sections were different, where the IF of pier-top section was the largest, followed by that of abutment span, and then that of center span. For two sections located symmetrically, the IF of the latter section in the direction of moving vehicles was bigger. Due to different principles, a more conservative value of IF can be used for design, but it cannot be directly utilized in evaluation. In the end, recommendations of IF for design and evaluation of dynamic performance of bridges subjected to moving vehicular loads were proposed, respectively. |
| Key words: highway bridge moving vehicles dynamic performance impact factor design method evaluation method |
