强震作用下损伤井架结构的力学演化规律  

Mechanics Evolution of the Damaged Derrick Structure under Strong Earthquakes

作　　者：杨明飞[1] 程华瑞 沙志平 YANG Mingfei;CHENG Huarui;SHA Zhiping(School of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan Anhui 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《安徽理工大学学报（自然科学版）》2021年第3期1-6,共6页Journal of Anhui University of Science and Technology:Natural Science

基　　金：安徽省高校自然基金重点资助项目(KJ2016A209)。

摘　　要：为了研究强震作用下损伤井架结构的力学演化规律,利用有限元建立某矿山井架结构的数值模型。在模型中,按15%失重率的梯度递增考虑井架立柱的局部损伤。首先对井架模型进行静力和模态分析,静力分析结果表明:随失重率的增加,井架结构损伤处应力和顶层最大位移均增大,并且呈现出二次函数关系;模态分析显示,在所选的失重率范围内,井架结构的局部损伤对其模态频率影响不大。接着对模型进行了强震作用下的动力分析,结果表明:随着地震波峰值加速度的增加,井架顶层最大位移、最大层间位移角和损伤处应力均呈现出线性增长。同时在地震波峰值加速度相同的情况下,失重率对井架结构顶层位移影响显著,和无损井架结构相比,结构顶层最大位移增幅达到76.89%。To study the mechanical evolution law of the damaged derrick structure under the strong earthquake action,a numerical modelwas established by using ANSYS software,in which the local damage of the column was considered according to the increase gradient of 15%weight loss rate.Firstly,the static and modal analyses of the derrick model were carried out.The results of static analysis showed that the stress at the damaged region and the maximum displacement at the top layer increased with the increase of the weight loss rate,showing a quadratic function relationship,while the results of modal analysis showed that the local damage in the chosen range of weight loss rate had little effect on its modal frequency in this paper.From the dynamic analysis with the strong earthquake action considered,it was found that the maximum displacement,the maximum interlayer displacement angle and the maximum stress at the damaged region all increased linearly with the increase of the peak acceleration of seismic wave,while the weight loss rate had a significant effect on the top layer displacement of the derrick structure when the peak acceleration value of seismic wave was certain.Compared with the undamaged derrick structure,the maximum top displacement of the damaged derrick structure increased by 76.89%.

关 键 词：损伤井架结构 强震作用 力学演化 失重率 模态频率 峰值加速度 

分 类 号：TU391[建筑科学—结构工程]