全轻混凝土剪力墙抗震性能试验研究

发布时间：2018-03-04 11:36

本文选题：全轻混凝土　切入点：剪力墙　出处：《吉林建筑大学》2016年硕士论文　论文类型：学位论文

【摘要】：现阶段框架—剪力墙结构体系中剪力墙通常采用普通混凝土,在地震作用中,剪力墙是最主要的抗侧力构件。对此本文提出了一种新的剪力墙配筋形式,并采用全轻混凝土浇筑剪力墙。全轻混凝土作为轻质材料,是由陶粒作粗骨料、陶砂作细骨料配制而成的一种轻集料混凝土。它具有轻质、高强、保温和耐火等特点,表观密度小是其最大特点,且变形性能较好,弹性模量相对较大。现以这种全轻混凝土剪力墙为研究对象,通过有限元模拟分析与试验结果相结合,分析和研究全轻混凝土剪力墙的抗震性能。采用ABAQUS有限元模拟分析软件建立剪力墙模型,通过非线性分析方法,研究不同配筋形式和不同轴压比对全轻混凝土剪力墙抗震性能的影响。分析有限元计算结果表明,采用新的配筋形式对全轻混凝土产生较强的约束性,延缓了裂缝的出现和继续发展。通过对各剪力墙模型的Mises应力云图、塑性应变量及荷载-位移滞回曲线和骨架曲线进行对比发现,轴压比对全轻混凝土剪力墙的影响较大,随着轴压比的提高,全轻混凝土剪力墙的抗剪承载力增大,极限位移和延性性能减小。当达到极限荷载后,随着位移的继续增加,各剪力墙承载力出现不同程度的下降,但配有斜向支撑钢筋的剪力墙承载力下降较缓,说明合理配置斜向支撑钢筋,可有效提高墙体的极限承载力和延性性能。为研究全轻混凝土剪力墙在不同配筋形式和不同轴压比下的抗震性能,本文对4片全轻混凝土剪力墙试件进行拟静力试验。分析全轻混凝土剪力墙在模拟地震作用下的破坏机理、滞回性能、刚度退化、延性性能及耗能能力等,为轻骨料混凝土结构的抗震设计规范提供一定的理论依据。试验结果表明,全轻混凝土的破坏形式主要是骨料断裂破坏。与普通配筋形式的全轻混凝土剪力墙相比,配有斜向支撑钢筋的全轻混凝土剪力墙的裂缝出现较晚,开展较多且缝宽较小,间距较密。斜向支撑钢筋对试件的屈服作用不明显,但对开裂荷载和极限荷载有明显提高。配有斜向支撑钢筋的全轻混凝土剪力墙的滞回曲线更加饱满且中间捏缩现象较轻,刚度退化减缓,极限承载力、延性性能和耗能能力均提高。在轴压比提高的情况下,全轻混凝土剪力墙的极限承载力提高,延性性能减弱,极限位移下降。全轻混凝土剪力墙的破坏形态均为墙角处的全轻混凝土被压碎。通过有限元计算与试验结果分析表明,全轻混凝土剪力墙具有一定的耗能能力和延性性能,可以为实际工程结构运用提供一定的理论参考。
[Abstract]:In the frame-shear wall structure system at present, the shear wall is usually made of ordinary concrete, and the shear wall is the most important anti-lateral force member in the earthquake action. In this paper, a new reinforcement form of the shear wall is proposed in this paper. The whole light concrete is used as lightweight material, which is made up of ceramsite as coarse aggregate and pottery sand as fine aggregate. It has the characteristics of light weight, high strength, heat preservation and fire resistance. The small apparent density is its biggest characteristic, and its deformation performance is better, and its elastic modulus is relatively large. This paper takes this kind of whole light concrete shear wall as the research object, and combines the finite element simulation analysis with the test results. The seismic behavior of the whole light concrete shear wall is analyzed and studied. The shear wall model is established by using ABAQUS finite element simulation analysis software, and the nonlinear analysis method is adopted. The effects of different reinforcement forms and axial compression ratios on the seismic behavior of whole light concrete shear walls are studied. The results of finite element analysis show that the new reinforcement forms have a strong constraint on the whole light concrete. By comparing the Mises stress cloud diagram, plastic strain, load-displacement hysteretic curve and skeleton curve of each shear wall model, it is found that the axial compression ratio has a great influence on the whole light concrete shear wall. With the increase of axial compression ratio, the shear capacity of all light concrete shear wall increases, and the ultimate displacement and ductility performance decrease. When the ultimate load is reached, the bearing capacity of each shear wall decreases in varying degrees with the increase of displacement. However, the bearing capacity of shear walls with inclined braced steel bars decreases slowly, which means that the rational disposition of inclined braced steel bars, The ultimate bearing capacity and ductility of the wall can be improved effectively. In order to study the seismic behavior of the whole light concrete shear wall under different reinforcement forms and different axial compression ratios, In this paper, the quasi-static test of four specimens of all-light concrete shear wall is carried out. The failure mechanism, hysteretic performance, stiffness degradation, ductility and energy dissipation capacity of full-light concrete shear wall under simulated earthquake are analyzed. The experimental results show that the main failure form of lightweight concrete is aggregate fracture failure, which is compared with the conventional reinforced concrete shear wall. The cracks of all light concrete shear walls with inclined braced steel bars appear later, develop more widely, have a smaller joint width, and the spacing is more dense. The yield effect of oblique braced steel bars to the specimens is not obvious. But the cracking load and ultimate load are improved obviously. The hysteretic curve of the full light concrete shear wall with inclined braced steel bar is more full, the phenomenon of intermediate pinch is lighter, the stiffness degradation is slowed down, and the ultimate bearing capacity is reduced. Both ductility and energy dissipation capacity are improved. Under the condition of increasing axial compression ratio, the ultimate bearing capacity of full light concrete shear wall is increased, and its ductility is weakened. The ultimate displacement is decreased. The failure pattern of the whole light concrete shear wall is that the whole light concrete is crushed at the corner of the wall. The finite element calculation and the test result show that the whole light concrete shear wall has certain energy dissipation capacity and ductility performance. It can provide some theoretical reference for practical engineering structure application.
【学位授予单位】：吉林建筑大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU398.2;TU352.11

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