地震与墙顶荷载作用下加筋桥台稳定性极限分析  

Limit Analysis on Stability of Reinforced Soil Abutments Under Earthquake and Footing Load

作　　者：钟少杰 李敏方 王伟[1,2] 魏培勇 徐鹏 李婷 梁训美[5] ZHONG Shaojie;LI Minfang;WANG Wei;WEI Peiyong;XU Peng;LI Ting;LIANG Xunmei(China Communications Construction Company Limited,Beijing 100088,China;China First Highway Engineering Co.Ltd.,Beijing 100088,China;Railway Engineering Research Institute,China Academic of Railway Sciences Co.Ltd.,Beijing 100081,China;State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Shandong ROAD New Materials Co.Ltd.,Taian Shandong 271000,China)

机构地区：[1]中国交通建设股份有限公司,北京100088 [2]中交一公局集团有限公司,北京100088 [3]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [4]石家庄铁道大学交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [5]山东路德新材料股份有限公司,山东泰安271000

出　　处：《铁道建筑》2024年第5期94-99,共6页Railway Engineering

基　　金：国家自然科学基金(52108331,52208358);河北省教育厅科学技术研究项目(ZD2021096)。

摘　　要：与传统桥台相比,加筋桥台结构轻便、造价经济、抗震性能优越,然而国内规范缺少针对地震与墙顶荷载共同作用下加筋桥台稳定性的计算方法。基于极限分析上限定理,本文对地震与墙顶荷载同时作用下整体式面板加筋桥台的安全系数进行计算分析,研究地震加速度系数、筋材强度与间距、墙顶荷载等因素对加筋桥台稳定性的影响。结果表明:墙顶荷载作用下,水平地震加速度系数由0增大到0.4时,安全系数降低约10%。竖向地震惯性力向下时安全系数小于向上时的安全系数;安全系数随筋材竖向间距的增大而减小,当筋材竖向间距小于墙高的5%时减小趋势明显;当筋材长度超过墙高的70%后,长度对安全系数的影响减弱,仅当筋材设计强度超过20 kN/m、筋材竖向间距小于0.2 m时安全系数出现增大趋势;安全系数随墙顶荷载的增大呈倒V形分布,当墙顶荷载为2倍墙体自重时安全系数取得最大值。Compared with traditional bridge abutments,reinforced soil bridge abutments have the advantages of lightweight structure,cost-effectiveness,and superior seismic performance.There is a lack of calculation methods for the stability of reinforced bridge abutments under the combined action of earthquake and footing load in domestic regulations.Based on the limit analysis upper bound theorem,the stability of reinforced soil bridge abutments with fullheight rigid wall facing under earthquake and footing load was analyzed and calculated.The influence of factors such as seismic acceleration coefficient,reinforcement strength and spacing,footing load position and magnitude on the stability of reinforced bridge abutments has been studied.The results show that under the footing load,the safety factor decreases by approximately 10%when the horizontal seismic acceleration coefficient increases from 0 to 0.4.Additionally,the safety factor for vertical seismic inertial force is lower when directed downward than when directed upward.The safety factor decreases with the increase of vertical spacing between reinforcement materials,and the decreasing trend is more pronounced when the vertical spacing between reinforcement materials is less than 5%of the wall height.When the length of the reinforcement exceeds 70%of the wall height,the influence of length on the safety factor weakens.Only when the design strength of the reinforcement exceeds 20 kN/m and the vertical spacing of the reinforcement is less than 0.2 m,the safety factor shows an increasing trend.The safety factor shows an inverted V-shaped distribution with the increase of footing load,and reaches its maximum value when the footing load is 2.0 times of the wall deadweight.

关 键 词：桥梁 加筋桥台 稳定性 数值计算 地震 条形荷载 极限分析 

分 类 号：U443.21[建筑科学—桥梁与隧道工程]