钢筋混凝土深梁填充钢框架恢复力模型及非线性行为研究

1、钢筋混凝土深梁填充钢框架恢复力模型及非线性行为研究        【中文摘要】钢框架、钢框架内填剪力墙反映了框架结构刚度变化的两个端点值,刚度增幅是突变性质的。而钢筋混凝土深梁填充钢框架结构体系可以满足两个端点刚度值之间的要求,实现了宽范围的刚度渐变调幅。通过改变钢筋混凝土深梁截面宽度、厚度、配筋率等可以得到不同的抗侧移刚度、极限承载力、延性和耗能能力。故此种结构体系可以有效地克服框架剪力墙结构剪切脆性破坏的缺点,且钢筋混凝土深梁采用装配式,有连接方便、可预制、震后易拆卸等优点,既可用于新建结构,又可用于结构加固,

2、具有很高的理论研究价值和广阔的应用远景。目前,国外对钢筋混凝土深梁填充钢框架结构的研究刚刚起步,国内的研究尚属空缺。本文通过低周反复加载的试验方法,对纯钢框架及内填不同高宽比钢筋混凝土深梁的钢框架进行试验研究。通过分析各构件的滞回曲线、骨架曲线、应力分布规律、变形特征、延性系数以及能量耗散系数,得出内填不同高宽比的钢筋混凝土深梁对钢框架滞回性能的影响。而后依据试验数据对构件骨架曲线以及各级荷载作用下的刚度进行拟合,得出恢复力模型,为弹塑性分析奠定了基础。本文运用ABAQUS有限元分析软件建立试验构件模型,验证试验骨架曲线,找到公道的模拟方法,并运用该种模拟方法对影响钢筋混凝土深梁填充钢框架结构

3、体系的系列参数进行扩展分析。得出钢筋混凝土深梁高宽比、厚度、暗柱及分布钢筋配筋率、钢框架柱轴压比等因素变化时对整体结构体系非线性行为的影响规律,并得到公道化设计参数范围。');【Abstract】 Steel frame and shear wall infilled steel frame reflect two endpoints of the amplitude of the structural stiffness.The increase of stiffness is transilient.Reinforced concrete deep beams infilled s

4、teel frame can meet the required stiffness between the two endpoints and can adjust the structual stiffness within a wide range.By changing width,thickness,reinforced ratio,etc, of the reinforced concrete deep beams,it could obtain different lateral rigidities,ultimate bearing capacities,ductilities

5、 and energy dissipation capacities.Therefore,the structure system can effectively improve the disadvantage of the brittle shear damage of shear wall structure,moreover,reinforced concrete deep beams uses the assembly type,so it can be connected easily,be prefabricated and be repaired after earthquac

6、k.This structure can applied to both new buildings and the reinforcement of established buildings.Thus it shows great theoretical research value and broad application foreground.At present,the research of reinforced concrete deep beam infilled steel frame abroad is at the very initial stage.In China

7、,this research is nearly blank.In this *,low-cycle loading test method is employed to study on the experiment of pure steel frame and steel frame infilled reinforced conctete deep beam of different depth-width ratio.By analyzing the hysteretic loops,skeleton curve,distribution of stress,deformation

8、behaviour,ductility coefficient and the energy dissipation coefficient of each specimen,we can get the influence of infilled different depth-width ratios reinforced eonctete deep beam on hysteretic behaviors of steel frame.Than it can obtain the restoring force model by fitting the skeleton curve an

9、d stiffness of each load through test data for elastoplastic analysis.The * uses finite element software ABAQUS to set up model and verify the skeleton curve of test specimens to find reasonable simulation method,than apply the method to analyse series of parameters which can influence the performance of reinforced concrete deep beams in filled steel frame structure system for getting the impact law of depth-width, thickness,reinforced ratio of embedded column and distributing bars of reinforced concrete deep beam,ratio of axial c