型钢混凝土复合受扭构件的滞回性能与恢复力模型研究

发布时间：2018-07-01 11:53

本文选题：型钢混凝土 + 复合受扭　；参考：《苏州科技学院》2015年硕士论文

【摘要】：型钢混凝土结构是介于普通钢筋混凝土结构与钢结构之间的一种新型结构,它皆具了钢筋混凝土结构与钢结构的优点,并由于组合效应的存在,其性能优于钢筋混凝结构与钢结构的简单叠加,这决定了其在结构抗震方面的突出优点以及拥有广泛的应用前景。本文基于课题组已完成的四组型钢混凝土复合受扭构件的低周反复加载试验,对共25个试件的滞回性能进行分析,发现各试件的滞回曲线具有明显的捏缩现象;过了开裂前的弹性阶段后,卸载刚度具有明显的退化现象;同一位移幅值重复加载时,第三次加载的承载力明显小于第一次,强度会有明显的退化;且所有试件的骨架曲线具有明显的“三折线”特征,可分为试件开裂前的弹性段、开裂后至达到最大承载力前的弹塑性段以及承载力开始下降的强度退化段。根据以上特征,本文通过确定开裂扭矩、开裂前刚度、峰值扭矩、达到峰值扭矩时的割线刚度以及强度退化段刚度五个参数来确定骨架曲线;再通过分析计算确定卸载刚度以及重复加载下的强度退化情况;最后根据试验滞回曲线,抓住主要特征,舍弃次要特征确定出滞回规则,从而确定了完整的型钢混凝土复合受扭构件的恢复力模型。最后本文还通过大型通用软件ABAQUS对试验进行全过程数值模拟,模拟结果与试验结果基本吻合,证明了有限元分析方法在研究型钢混凝土结构时的可行性。
[Abstract]:Steel reinforced concrete structure is a new type of structure between ordinary reinforced concrete structure and steel structure. It has the advantages of reinforced concrete structure and steel structure, and because of the existence of combination effect, Its performance is superior to the simple superposition of reinforced concrete structure and steel structure, which determines its outstanding advantages in aseismic aspects of the structure and has a wide application prospect. Based on the low cycle repeated loading test of four groups of SRC composite torsion members, the hysteretic behavior of 25 specimens is analyzed in this paper. It is found that the hysteretic curves of each specimen have obvious pinch phenomenon. After the elastic stage before cracking, the unloading stiffness has obvious degradation phenomenon, when the same displacement amplitude is repeatedly loaded, the bearing capacity of the third loading is obviously smaller than that of the first, and the strength will degenerate obviously. The skeleton curve of all specimens has the characteristic of "three broken lines", which can be divided into elastic section before cracking, elastic-plastic section from crack to maximum bearing capacity and strength degradation section where the bearing capacity begins to decrease. According to the above characteristics, this paper determines the skeleton curve by determining five parameters: crack torque, pre-crack stiffness, peak torque, Secant stiffness when peak torque is reached and stiffness of strength degradation segment. Then the unloading stiffness and strength degradation under repeated loading are determined by analysis and calculation. Finally, according to the experimental hysteretic curve, the main characteristics are grasped, and the hysteretic rules are determined by abandoning the secondary characteristics. Thus, a complete model of restoring force of steel reinforced concrete composite torsional members is established. At last, the whole process of the experiment is simulated by Abaqus, and the simulation results are in good agreement with the test results, which proves the feasibility of the finite element analysis method in the study of steel reinforced concrete structures.
【学位授予单位】：苏州科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU398.9

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