框架锚杆支护结构动力模型建立及响应分析  

Dynamic model establishment and response analysis of frame anchors supporting structure

作　　者：叶帅华[1] 冯文刚 李京榜 陶晖 YE Shuai-hua;FENG Wen-gang;LI Jing-bang;TAO Hui(Key Laboratory of Disaster Mitigation in Civil Engineering of Gansu Province,Lanzhou Univ.of Tech.,Lanzhou 730050,China;School of Civil Engineering,Lanzhou Institute of Technology,Lanzhou 730050,China;Department of Architectural Engineering,Gansu Vocational College of Architecture,Lanzhou 730050,China)

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]兰州工业学院土木工程学院,甘肃兰州730050 [3]甘肃建筑职业技术学院建筑工程系,甘肃兰州730050

出　　处：《兰州理工大学学报》2024年第1期116-122,共7页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51768040);甘肃省高校青年博士基金(2023QB-048);甘肃省住房与城乡建设厅科技攻关项目(JK2023-15)。

摘　　要：为分析地震作用下框架锚杆支护结构的动力响应,以某中跨立柱单元为对象,考虑边坡加速度放大效应对支护结构上动土压力的影响,将立柱简化为抗弯刚度均匀的竖向杆件,依据锚杆工作机理将自由段简化为线弹簧,考虑土体阻尼影响将锚固段简化为线弹簧与牛顿粘壶,支护结构坡脚处简化为固端约束,进而建立支护结构动力响应简化模型.运用力法与图乘法对支护结构动力响应进行求解,建立支护结构动弯矩和动位移与坡高之间的关系.模型计算方法与Geo-Studio有限元软件结果对比,验证模型的合理性与可行性,为此类工程设计与地震作用下支护结构动力研究提供相应的参考.In order to analyze the dynamic response of frame anchors supporting structure under seismic effect,a mid span column element was taken as the object,and the dynamic earth pressure was analyzed by considering the amplification effect of slope acceleration.Then the column was simplified as a vertical member with uniform bending stiffness.According to the working mechanism of the anchor rod,the free section was simplified as a line spring,and the anchor section was simplified as a line spring and a Newton viscous pot under the consideration of the influence of soil damping.The slope foot of the support structure was simplified as a fixed end constraint,then the simplified dynamic response model of supporting structure was established.The dynamic response of the supporting structure was solved by the force method and graph multiplication method,and the relationship between the dynamic bending moment as well as dynamic displacement of the supporting structure and the slope height was established.The alogorithm was compared with the result of Geo-Studio finite element software to verify the rationality and feasibility of the model,which can provide corresponding reference for such engineering design and dynamic research of supporting structure under earthquake.

关 键 词：地震作用 动力模型 动力响应 立柱 

分 类 号：TU443[建筑科学—岩土工程]