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不同交通荷载方式下的土基应力分析

发表时间:2009-03-15  浏览量:1529  下载量:795
全部作者: 朱东方,王景鹏,郑慧慧,尹冠生
作者单位: 长安大学理学院
摘 要: 针对不同的交通荷载,在有限元软件ANSYS中建立模型,研究道路结构中土基层的应力分布规律。首先模拟静荷载作用下的土基应力分布状况,再用移动恒定荷载模拟平整路面上的车辆行走状况,最后用移动简谐荷载模拟不平整路面上的车辆行走状况。分析结果表明:静载时,Mises最大等效应力和Y方向应力与车载基本呈线性规律;移动情形下,车载一定时,Mises最大等效应力随车速增加而减小,近似二次趋势;车速一定时,Mises最大等效应力则随车载增加,近似以线性规律增加。通过分析计算结果,在Matlab中拟合曲线,并给出各种工况下的应力分布规律(经验方程),分析结果可为道路结构设计和施工提供参考。
关 键 词: 应用力学;土基;应力;交通荷载
Title: Stress analysis of soil base under different traffic loads
Author: ZHU Dongfang, WANG Jingpeng, ZHENG Huihui, YIN Guansheng
Organization: College of Science, Chang’an University
Abstract: For different traffic loads, the stress distribution of the soil base course in the road structure is studied, with the finite element model established in the software of ANSYS. First, stress distribution of soil base under static load is simulated. And then transportation constant loads are used to simulate the traffic on the roads with smooth pavements. At last transportation harmonic loads are used to simulate the traffic on the roads with rough pavements. The results show that, the relation between car weight and the maximum Mises stress is in the linear law, and the same rule to Y direction of the stress when the load is static. Moreover, when the weight is constant and the load is dynamic, the maximum Mises stress decreases as the velocity increases, similar to a secondary trend. Furthermore, when the speed is certain, the maximum Mises stress increases as the weight increases, approximate to linear law. Through analyzing the calculation results, this paper gives all kinds of distribution of the stress in Matlab, and the results can provide the reference for the road design and construction.
Key words: applied mechanics; soil base; stress; traffic loads
发表期数: 2009年3月第5期
引用格式: 朱东方,王景鹏,郑慧慧,等. 不同交通荷载方式下的土基应力分析[J]. 中国科技论文在线精品论文,2009,2(5):442-449.
 
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