正放四角锥网架结构最佳跨高比及隔震性能分析  

Analysis of the Optimal Span-Height Ratio and the Isolation Performance of the Square Pyramid Space Truss Structures

作　　者：顾镇媛 沈吴钦 陈润波 GU Zhenyuan;SHEN Wuqin;CHEN Runbo(School of Transportation and Civil Engineering,Nantong University,Nantong 226019,China)

机构地区：[1]南通大学交通与土木工程学院,江苏南通226019

出　　处：《南通大学学报（自然科学版）》2020年第3期73-82,共10页Journal of Nantong University(Natural Science Edition)　

基　　金：国家自然科学基金项目(51808298);江苏省高等学校自然科学研究面上项目(18KJB560014);江苏省大学生创新创业训练项目(201910304120Y)。

摘　　要：为研究地震作用下正放四角锥网架结构合理跨高比及隔震性能,建立一系列正放四角锥大跨网架结构模型,以网架节点位移与整体用钢量为控制点,研究不同跨度、不同平面形式、不同支承方式大跨网架各自最合理的跨高比。然后,选取90 m跨度且采用最佳跨高比的四类正放四角锥网架结构为对象,基于时程分析法对比分析四类隔震与非隔震网架结构响应规律。研究结果表明:正放四角锥网架结果的最佳跨高比与平面形状、支承方式关系甚微,仅与跨度有关;采用柱底隔震后网架杆件的轴力和节点最大加速度与隔震前相比均大幅度减小,结构自振周期、地震动输入对隔震效果均有不同程度的影响。In order to study the reasonable span-height ratio and isolation performance of the structure under the action of earthquake,a series of square pyramid space truss structural models are established.The node displacement and overall steel consumption are taken as the control points to study the most reasonable span-to-height ratios of square pyramid space truss structural models with different spans,different plane forms and different supporting modes respectively.Then 4 types of square pyramid space truss structures with a span of 90 m and an optimal span-height ratio are selected to analyze the seismic response law of the isolated and non-isolated long-span truss structures by the time history analysis method.The results show that:the optimal span-height ratio of square pyramid space truss structures has little to do with its plane forms or supporting ways,it is related with the spans.The use of column base isolation makes the axial forces of members and maximum node acceleration of truss decrease greatly.Both the natural period and the seismic input have effects on the isolation efficiency in different degree.

关 键 词：正放四角锥网架 隔震结构 最佳跨高比 时程分析 地震响应 

分 类 号：TU352.1[建筑科学—结构工程]