DESIGN AND PERFORMANCE INVESTIGATION ON NOVEL PREFABRICATED SELF-CENTERING RC SHEAR WALL
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摘要:
为满足结构施工效率高、震后功能可恢复的多重目标，提出了一种新型装配式自复位RC剪力墙。该新型剪力墙主要包含RC墙板、碟簧复位装置和摩擦耗能装置，三者仅通过高强螺栓组装而成，施工方便且效率高；在地震作用下，主要由碟簧复位装置和摩擦耗能装置提供抵抗弯矩和恢复力，能减小整体剪力墙构件的震后残余变形和损伤，有效提高其震后功能可恢复性。该文分析了新型装配式自复位RC剪力墙的截面受力形式，提出了其截面承载力计算公式；设计了一新型装配式自复位RC剪力墙构件进行数值模拟，获得了其滞回性能，对比分析了其与普通剪力墙的承载力、耗能能力、自复位性能。结果表明：在相同位移角下，新型装配式自复位RC剪力墙的承载力小于普通剪力墙，但其极限承载力与普通剪力墙的峰值承载力相当，且其在超大震(2.0%位移角)下的残余位移角仅为0.31%，具有优异的自复位能力，能使结构在震后具有低损伤、功能可恢复的特点。增大碟簧复位装置的预压力，可有效提高新型剪力墙构件的承载力和累积耗能，但残余变形也相应增大。
Abstract:A novel prefabricated self-centering reinforced concrete (RC) shear wall, which is mainly composed of RC wall slab, self-centering device with disc springs and friction energy dissipation device, is proposed to meet multiple objectives of high construction efficiency and recoverable function after an earthquake. The three main parts of the novel RC shear wall are assembled through high-strength bolts with convenient and efficient construction. When the wall is subjected to seismic loads, the resisting moment and restoring force is mainly provided by the self-centering devices with disc springs and friction energy dissipation devices, thereby the damage and residual deformation of the component can be reduced and its seismic resilience can be effectively improved. In this paper, the sectional forces of the novel prefabricated self-centering RC shear wall are analyzed and its calculation method of the section bearing capacity is proposed. In addition, a novel RC shear wall is designed and its hysteretic behavior is obtained according to the numerical model. Then the bearing capacity, energy dissipation and self-centering capabilities are compared between the novel RC shear wall and the conventional RC shear wall. The results indicate that the bearing capacity of the novel RC shear wall is less than that of the conventional RC shear wall at the same drift ratios, whereas its ultimate bearing capacity is equal to the peak bearing capacity of the conventional RC shear wall. Additionally, the residual drift ratio of the novel RC shear wall is just 0.31% under strong earthquake (corresponding to 2.0% drift ratio), indicating that the self-centering capability of the novel RC shear wall is satisfactory, so that the structure has the abilities of low damage and seismic resilience. Increase in the pre-loading of the self-centering device with disc springs can greatly improve the bearing capacity and energy dissipation capability of the novel RC shear wall, while its residual displacement is correspondingly increased.
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图 1 装配式自复位RC剪力墙构造
Figure 1. Configuration of the prefabricated self-centering RC shear wall
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图 4 新型装配式自复位RC剪力墙变形示意图
Figure 4. Deformation diagram of the novel prefabricated self-centering RC shear wall
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图 5 新型装配式自复位RC剪力墙的理论力-位移关系
Figure 5. Theoretical force-displacement relationship of the novel prefabricated self-centering RC shear wall
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图 6 新型装配式自复位RC剪力墙截面受力示意图
Figure 6. Sectional forces diagram of the novel prefabricated self-centering RC shear wall
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图 7 新型装配式自复位RC剪力墙参数设计流程
Figure 7. Parameter design process of the novel prefabricated self-centering RC shear wall
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图 8 新型装配式自复位RC剪力墙数值模型
Figure 8. Numerical model of the novel prefabricated self-centering RC shear wall
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图 9 新型装配式自复位RC剪力墙滞回曲线
Figure 9. Hysteretic curve of the novel prefabricated self-centering RC shear wall
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