本文選題：全輕混凝土　切入點：剪力墻　出處：《吉林建筑大學》2016年碩士論文　論文類型：學位論文

【摘要】：現(xiàn)階段框架—剪力墻結構體系中剪力墻通常采用普通混凝土,在地震作用中,剪力墻是最主要的抗側力構件。對此本文提出了一種新的剪力墻配筋形式,并采用全輕混凝土澆筑剪力墻。全輕混凝土作為輕質材料,是由陶粒作粗骨料、陶砂作細骨料配制而成的一種輕集料混凝土。它具有輕質、高強、保溫和耐火等特點,表觀密度小是其最大特點,且變形性能較好,彈性模量相對較大。現(xiàn)以這種全輕混凝土剪力墻為研究對象,通過有限元模擬分析與試驗結果相結合,分析和研究全輕混凝土剪力墻的抗震性能。采用ABAQUS有限元模擬分析軟件建立剪力墻模型,通過非線性分析方法,研究不同配筋形式和不同軸壓比對全輕混凝土剪力墻抗震性能的影響。分析有限元計算結果表明,采用新的配筋形式對全輕混凝土產生較強的約束性,延緩了裂縫的出現(xiàn)和繼續(xù)發(fā)展。通過對各剪力墻模型的Mises應力云圖、塑性應變量及荷載-位移滯回曲線和骨架曲線進行對比發(fā)現(xiàn),軸壓比對全輕混凝土剪力墻的影響較大,隨著軸壓比的提高,全輕混凝土剪力墻的抗剪承載力增大,極限位移和延性性能減小。當達到極限荷載后,隨著位移的繼續(xù)增加,各剪力墻承載力出現(xiàn)不同程度的下降,但配有斜向支撐鋼筋的剪力墻承載力下降較緩,說明合理配置斜向支撐鋼筋,可有效提高墻體的極限承載力和延性性能。為研究全輕混凝土剪力墻在不同配筋形式和不同軸壓比下的抗震性能,本文對4片全輕混凝土剪力墻試件進行擬靜力試驗。分析全輕混凝土剪力墻在模擬地震作用下的破壞機理、滯回性能、剛度退化、延性性能及耗能能力等,為輕骨料混凝土結構的抗震設計規(guī)范提供一定的理論依據。試驗結果表明,全輕混凝土的破壞形式主要是骨料斷裂破壞。與普通配筋形式的全輕混凝土剪力墻相比,配有斜向支撐鋼筋的全輕混凝土剪力墻的裂縫出現(xiàn)較晚,開展較多且縫寬較小,間距較密。斜向支撐鋼筋對試件的屈服作用不明顯,但對開裂荷載和極限荷載有明顯提高。配有斜向支撐鋼筋的全輕混凝土剪力墻的滯回曲線更加飽滿且中間捏縮現(xiàn)象較輕,剛度退化減緩,極限承載力、延性性能和耗能能力均提高。在軸壓比提高的情況下,全輕混凝土剪力墻的極限承載力提高,延性性能減弱,極限位移下降。全輕混凝土剪力墻的破壞形態(tài)均為墻角處的全輕混凝土被壓碎。通過有限元計算與試驗結果分析表明,全輕混凝土剪力墻具有一定的耗能能力和延性性能,可以為實際工程結構運用提供一定的理論參考。
[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.
【學位授予單位】：吉林建筑大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TU398.2;TU352.11

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