移动力群引起的软土地基上Winkler梁振动研究

王英杰;魏庆朝;时瑾;龙许友

振动与冲击 ›› 2009, Vol. 28 ›› Issue (10) : 210-213.

PDF(2205 KB)
PDF(2205 KB)
振动与冲击 ›› 2009, Vol. 28 ›› Issue (10) : 210-213.
论文

移动力群引起的软土地基上Winkler梁振动研究

  • 王英杰;魏庆朝;时瑾;龙许友

作者信息 +

Study on Winkler beam vibration due to moving loads on soft foundation

  • WANG Ying-jie;WEI Qing-chao;SHI Jin;LONG Xu-you
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文章历史 +

摘要

在高速运行条件下,当荷载达到某种速度时,极易引起结构的强烈振动。本文从Winkler地基梁振动微分方程出发,推导了临界速度的表达式,对移动力群作用下Winkler地基梁变形特征进行了分析,在此基础上,重点研究了基础支承刚度、运行速度对Winkler地基梁振动的影响关系。研究得到:①随着移动力个数增加,Winkler地基梁临界速度提高,动挠度也随之增加,力群叠加效应导致了临界速度提高和振动加剧。②随着地基刚度的降低,整个Winkler地基梁强振动带迅速向速度较低的区域移动,振动强度急剧提高。③增加Winkler地基的支承刚度可以有效提高Winkler地基梁的临界速度。

Abstract

In high-speed conditions, when moving loads reached certain speed, the structure would vibrate heavily. In this paper according to the vibration differential equation of Winkler beam under moving loads, critical speed expression was obtained. Then the influences of foundation supporting stiffness and moving loads speed to Winkler foundation beam vibration were studied in detail. The conclusions are as follows: (1) Critical speed and dynamic deflection of Winkler foundation beam grow with an increase of moving loads number. Moving loads superposition lead to critical speed increase and vibration intensified. (2) When foundation supporting stiffness decrease, the whole vibration area of Winkler foundation beam moves to the lower speed regions and vibration strength increases rapidly. (3) It is also proved that the increase of Winkler foundation supporting stiffness can effectively improve the critical speed of Winkler foundation beam.

关键词

软土地基 / Winkler地基梁 / 移动力群 / 临界速度

Key words

soft foundation / Winkler foundation beam / moving loads / critical speed

引用本文

导出引用
王英杰;魏庆朝;时瑾;龙许友 . 移动力群引起的软土地基上Winkler梁振动研究[J]. 振动与冲击, 2009, 28(10): 210-213
WANG Ying-jie;WEI Qing-chao;SHI Jin;LONG Xu-you. Study on Winkler beam vibration due to moving loads on soft foundation[J]. Journal of Vibration and Shock, 2009, 28(10): 210-213

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