摘要
采用集中塑性铰理论和SAP2000结构分析软件,对某拟建大跨钢拱桁架结构整体进行在地震波作用下的弹塑性地震响应分析。分析中考虑了几何和材料双重非线性影响,获得了节点位移响应、杆件塑性铰的分布特征、结构的整体变形、失效形态及结构延性系数,评定了该结构的极限承载力、失效类型和变形能力。结果表明,该结构在地震波下的失效界限地震加速度峰值为1 000gal,失效时最大竖向变形为短向跨度的1/200,可满足"避难与救灾建筑结构"的抗震性能设防的要求;结构的失效类型为延性强度破坏,临界失效时出现塑性铰的杆件分布较均匀;结构各方向延性系数均大于4,具有较好的变形能力;由整体稳定控制承载力的落地式钢拱桁架结构体系具有较大的抗震潜能,跨度60m的空间拱桁架结构体系,用钢量46.1kg/m2就可达到8度设防区灾难地震设防810gal的要求。
With concentrated plastic hinge theory and SAP2000software,the elastic-plastic time history analysis on a large-span floor type steel arch truss structure is carried out under different earthquake waves.In the analysis both geometric and material nonlinear effects are taken into consideration.The node displacement responses,plastic hinge distributions,deformation mode and failure patterns and structural ductility coefficient are obtained.The results show that：under earthquake waves,the assess value of the failure peak of earthquake waves is 1 000gal and its corresponding maximum vertical displacement is 1/200that of the short span,which could meet the requirements of the ＂earthquake refuge and relief system＂;The structure failure type is ductile strength damage,before damage the distribution of the bars with plastic hinges is rather uniform;Structural ductility coefficients of each direction are greater than 4,the deformation ability is strong;Meeting the requirement of the stability capacity,the floor type steel arch truss has a good seismic potential capacity.With arch span of 60mand steel quantity of 46.1km/m2 the space truss structure system can reach the requirement of 810gal for 8degree earthquake area.
出处
《太原理工大学学报》
CAS
北大核心
2014年第4期548-552,共5页
Journal of Taiyuan University of Technology
基金
国家自然科学基金资助项目(50878137)
山西省科技攻关项目(200890321086)
关键词
空间钢拱桁架
弹塑性时程分析
塑性铰
结构延性
抗震避难与救灾据点
floor type steel arch truss
elastic-plastic time history analysis
plastic hinge
Structural ductility
earthquake refugee relief stronghold
