Out-of-Plane Stability of Frame Hollow Brick Infilled Walls with Horizontal Slip Layers
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摘要:
空心砖填充墙体内设置水平滑移层，能削弱墙充墙的斜撑作用，可有效减轻空心砖填充墙的破坏程度. 为研究设置水平滑移层框架空心砖填充墙体的平面外稳定性，分析了填充墙平面外破坏模式，基于设置水平滑移层框架空心砖填充墙的平面内拟静力试验，建立设置水平滑移层和未设置水平滑移层的框架空心砖填充墙的有限元模型，开展了平面外数值模拟的对比分析. 结果表明：水平滑移层会降低墙体整体性，削弱周边框架对墙体的约束作用；与未设置滑移层的普通填充墙相比，设置水平滑移层的填充墙在平面外荷载作用下的破坏程度增加，平面外位移和刚度退化速率增大，平面外开裂荷载降低43.1%，峰值荷载降低22.2%；设置水平滑移层的填充墙在不同抗震设防烈度的多遇和罕遇地震作用下，墙体平面外承载力大于按规范计算要求的平面外承载力，满足规范要求.
Abstract:The horizontal slip layer in the hollow brick infilled wall can weaken the inclined bracing effect of the wall and effectively reduce the damage degree of the hollow brick infilled wall. In order to understand the out-of-plane stability of the frame hollow brick infilled wall with horizontal slip layers, the out-of-plane failure mode of the wall was analyzed. Based on the in-plane quasi-static test of the frame hollow brick infilled wall with horizontal slip layers, the finite element models of the hollow brick infilled wall with and without horizontal slip layers were established, and the out-of-plane numerical simulation analysis was carried out. Results show that the horizontal slip layer will reduce the integrity of the wall and weaken the constraining effect of the surrounding frame on the wall. Compared with the ordinary infilled wall without slip layer, the failure degree of the infilled wall with horizontal slip layer is increased; specifically, the out-of-plane displacement and stiffness degradation rate is increased, the out-of-plane cracking load is reduced by 43.1%, and the peak load is reduced by 22.2%. Under the action of multiple and rare earthquakes with different seismic fortification intensities, the out-of-plane bearing capacity of the infilled wall with horizontal slip layers is greater than that calculated according to the code, which meets the code requirements.
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表 1 配筋信息
Table 1. Reinforcement information of Specimens
类型 框架柱纵筋 框架梁纵筋 箍筋/mm 带滑移层墙 6 
4 
普通墙 6 4 
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表 2 试件材料信息
Table 2. Material properties of specimens
钢筋 空心砖 砂浆抗压
强度/MPa混凝土抗压
强度/MPa孔洞
率/%单位重
度/N抗压强
度/MPa屈服强
度/MPa抗拉强
度/MPa屈服强
度/MPa抗拉强
度/MPa402 515 480 602 47.85 49.60 3.50 5.62 33.50
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表 3 滑移材料属性
Table 3. Material characteristics of slip layer
质量密度/（kg·m−3） 杨氏模量/MPa 泊松比 1 240.10 9.52 0.43
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表 4 平面外承载力对比
Table 4. Comparison of out-of-plane bearing capacity
类型 FP/kPa FH/kPa （FP−FH）/FP/% 开裂荷载值 21.1 12.0 43.1 峰值荷载值 43.2 33.6 22.2
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表 5 按规范计算的水平地震力及安全系数
Table 5. Horizontal seismic force and safety factor
类型 抗震设防烈度 规范计算的水平地震力设计值/kN 开裂安全系数（破坏安全系数） 未设滑移层填充墙 设滑移层填充墙 多遇地震 6 度 2.8 80.5（164.8） 45.8（128.2） 7 度（0.15g） 8.3 26.8（54.9） 15.3（42.7） 8 度（0.30g） 16.5 13.4（27.5） 7.6（21.4） 9 度 22.0 10.1（20.6） 5.7（16.0） 罕遇地震 6 度 19.3 11.5（23.5） 6.5（18.3） 7 度（0.15g） 49.5 4.5（9.2） 2.5（7.1） 8 度（0.30g） 82.6 2.7（5.5） 1.5（4.3） 9 度 96.3 2.3（4.7） 1.3（3.7）
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