高速公路防护栏支柱的水平基床反力  

Horizontal subgrade reaction of highway guardrail column

作　　者：杨璐[1] 陈玳珩[2] 沈新普[1] 杜显赫[1] 

机构地区：[1]沈阳工业大学建筑工程学院,沈阳110870 [2]日本东京理科大学工学部

出　　处：《沈阳工业大学学报》2010年第1期115-120,共6页Journal of Shenyang University of Technology

基　　金：国家自然科学基金资助项目(10872134);三峡库区地质灾害省部共建教育部重点实验室开放基金资助项目(2008KDZ10);辽宁省教育厅基金资助项目(05L310)

摘　　要：为准确模拟分析汽车与防护栏碰撞的耦合碰撞过程,提出了利用土壤荷重与水平载荷的作用关系建立水平基床反力的评估理论,即以简单形式描述水平基床反力q和水平位移v的关系.采用Mohr-coulomb屈服准则,结合ABAQUS有限元数值模拟结果进行研究,发现支柱回转变形过程中水平基床反力系数不是恒定的,而是随着变形的发展逐渐变小;水平荷载引起土体产生塑性屈服,这一现象是由最大水平应力分量σx和最小应力分量σy的差值引起的.提出了水平基床极限承载力的理论公式,建立了土体在受水平力作用下水平基床反力的理论模型,为实际工程的设计与分析提供了参考.In order to exactly analyze the coupling impact process between vihical and guardrail,the estimation theory of horizontal subgrade reaction coefficient was established based on the interaction relationship of soil load and horizontal load. In the proposed theory,the relationship between horizontal subgrade reaction q and horizontal displacement v was described with a simple form. Using the Mohr-coulomb yield criterion and combining the ABAQUS finite element numerical simulation result,it is found that during the rotary deformation of the column,the horizontal subgrade reaction coefficient is not constant,but will decrease with the deformation. The plastic yield of soil caused by horizontal load depends on the difference in max stress component σx and min stress component σy. In addition,a theoretical formula to calculate the ultimate bearing capacity of horizontal subgrade was proposed,and the theoretical model of horizontal subgrade reaction under the horizontal load was established. The present theory can provide a reference for the design and analysis of practical project.

关 键 词：高速公路 防护栏 支柱 水平荷载 水平基床反力 极限承载力 MOHR-COULOMB屈服准则 数值模拟 

分 类 号：TU528.01[建筑科学—建筑技术科学]