摘要
为研究基于套建增层的单跨双层钢框架的抗震性能,以长细比、轴压比及加载位置为参数,设计18组单跨双层钢框架体系;基于简化的力学模型和材料的本构关系,利用ABAQUS有限元软件建立有限元模型,开展框架结构在单调水平荷载作用下的静力分析,通过仿真分析与单跨双层钢框架试验结果对比,两者吻合较好,验证有限元模型建立的合理性;开展18组单跨双层钢框架非线性滞回分析,提取并比较荷载—位移滞回曲线、包络图和骨架曲线,基于能量等效法计算结构的延性因数,考察结构体系的塑性铰出现时间及分布规律;给出钢框架在大跨、重载和套建增层工程中的设计建议.结果表明:单跨双层钢框架结构滞回曲线饱满,塑性、耗能及延性性能较好,形成强柱弱梁的塑性铰机制,为在抗震区新建和既有建筑改造提供技术支撑.
In order to study the seismic performance of single-span double-layer steel frame,the slenderness ratio,axial compression ratio and the loading position for the parameters,18 groups of single-spandouble-layer steel frame system was designed.Based on a simplified mechanical model and constitutive relations of material,using ABAQUS software to establish the corresponding finite element model,static analysis of frame structure under monotonic horizontal load was carried out.Through the simulation analysis and test results of the single-span double-layer steel frame,both are in good agreement,the rationality the finite element model is established is verified in this paper.The nonlinear hysteretic analysis of 18 groups of single-span double-layer steel framework is performed,on the basis the author extracted and compared the load-displacement hysteretic curves,the envelope and skeleton curves.Based on the energy equivalent method,ductility factor of structure is calculated,and the plastic hinges of structure system appeared successively and distribution regularity was investigated.Design recommendations of steel frame in the long-span,heavy load and outer-jacketing adding-story engineering are given.The results show that the single-span double-layer steel frame structure has plump hysteretic curve,plastic performance,dissipation energy and ductility are good,and plastic hinge mechanism of strong column and weak beam is formed.These can provide technical support for new engineering and renovation of existing buildings.
出处
《东北石油大学学报》
CAS
北大核心
2014年第5期111-120,11-12,共10页
Journal of Northeast Petroleum University
基金
教育部高等学校博士学科点专项科研基金项目(新教师类:20122322120004)
黑龙江省自然科学基金面上项目(E201336)
国家自然科学基金项目(51178087)
关键词
套建增层
钢框架
滞回性能
塑性铰
设计建议
outer-jacketing adding-story structure
steel frame
hysteretic behavior
plastic hinge
design suggestions
