路桥过渡段路基加固体的拓扑优化  

Topology optimization of reinforced subgrade body at transition section between bridge and road

作　　者：俞永华 谢永利[2] 杨晓华[2] 

机构地区：[1]中国公路工程咨询集团有限公司,北京100101 [2]长安大学公路学院,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2007年第6期39-43,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家西部交通建设科技项目(200131881259)

摘　　要：应用拓扑优化理论,采用简化的假定条件,基于应变能最小即刚度最大原理,对路桥过渡段路基加固体的结构布置形式进行了优化。通过分析荷载模式、填高、加固长度和面积等因素对最优拓扑图形的影响,得出了路桥过渡段路基加固体的最优布置方式。拓扑优化结果表明:路桥过渡段路基加固的不同区域对结构刚度的贡献排序为,固定端附近区域-中间偏上区域-中间偏下区域-路基顶面远端区域;上长下短的倒梯形布置形式的结构刚度最大,其抵抗地基沉降变形的能力最强,表明目前桥头常用的倒梯形布置形式具有理论上的合理性;路基加固体底面布置长度应不小于2 m,由下向上斜率应缓于1∶1。Through the application of topology optimization, on the basis of the principle of the least strain energy equivalent to the most stiffness, the structural disposal form of reinforced subgrade body at the transition section between bridge and road is optimized. Through analyzing the influence factor of the optimization topology figure such as load mode, filling height, reinforced length and area, the best disposal form is received. The result of topology optimization shows that the contribution to advance the structure stiffness by reinforced region of subgrade is as the following sequence： the region around the fixed point, the upper region, the underside region, the region far from the fixed point. The disposal form of converse trapezoid has the most stiffness and the best capacity of resisting the length is not less than 2 m and the slope from foundation settlement. The underside disposal underside to top surface is not more than 1 ： 1. 4 figs, 7 refs.

关 键 词：道路工程 路桥过渡段 路基加固体 拓扑优化 结构布置形式 

分 类 号：U213.15[交通运输工程—道路与铁道工程]