台后填土及桥头跳车动力荷载作用下的扶壁式桥台计算分析  

Computational Analysis of Buttress Abutment under the Effect of Earth Filling behind the Abutment and Dynamic Load in Vehicle-jumping at Bridgehead

作　　者：李克磊 LI Ke-lei

机构地区：[1]宁夏公路勘察设计院有限责任公司,宁夏银川750001

出　　处：《内蒙古公路与运输》2021年第6期17-20,共4页Highways & Transportation in Inner Mongolia

摘　　要：在扶壁式桥台的设计过程中,由于其结构较为复杂,且时常受到桥头跳车动力荷载作用,因此利用常规简化计算方法一般很难得到桥台准确的受力情况。文章以某高速公路桥梁扶壁式桥台为例,利用有限元软件MIDAS/GTS建立桥台、地基土及台后填土三维计算模型,根据桥头跳车高度和车轮冲击系数的关系,对桥台进行台后填土及桥头跳车动力荷载作用下的施工阶段和运营阶段模拟。通过计算分析不同跳车高度下的扶壁台各关键部位受力情况,得出桥台受力薄弱位置及跳车高度对不同部位的受力影响程度,从而可有针对性地指导桥台配筋设计,保证结构的安全性、耐久性。In the design process of buttress abutment,because of its complex structure and frequent effect of dynamic load in vehicle-jumping at bridgehead,it’s difficult to get the accurate bearing condition of abutment by the method of conventional simplified calculation.Taking a highway bridge buttress abutment as an example,a three-dimensional computational model of abutment,soil and earth filling behind the abutment is constructed by finite element software MIDAS/GTS.According to the relationship between the vehicle-jumping height at bridgehead and the impact factor of wheels,the construction stage and operation stage of abutment under the effect of earth filling behind the abutment and dynamic load in vehicle-jumping at bridgehead are simulated.After the bearing conditions of abutment key parts with different vehicle-jumping heights at bridgehead are calculated and analyzed,the weak bearing parts and effect degree of vehicle-jumping height on mechanics can be known.Thereby,it can guide the design of abutment reinforcement in a targeted manner to ensure the safety and durability of the structure.

关 键 词：扶壁式桥台 受力情况 数值模拟 桥头跳车 动力荷载 有限元 

分 类 号：U416[交通运输工程—道路与铁道工程]