Abstract

In this study, results of testing eight clay brick walls are presented. The walls were tested under distributed vertical load and gradually increased lateral load. The walls consisted of one solid wall, two walls as control and five walls with openings strengthened by using: RC frame around the opening, RC frame with the lintel extended to the ends of the wall, steel channel frame around the opening, confining the wall with RC frame, and near-surface mounted bars. Results showed that all the strengthening techniques increased lateral load-carrying capacity, ductility and toughness compared to the non-strengthened walls. The highest increase in shear strength was for the wall strengthened with steel frame around the opening 88%, followed by the wall strengthened with NSM steel bars 56%. From the load deflection curves energy dissipated by the walls during loading was calculated. Walls with interior steel frame, outside confinement, interior RC frame showed the highest increase in energy dissipation over the control wall by 470, 268, and 250% respectively. Calculation of shear strength based on existing equations is presented, and an analytical model is proposed for predicting lateral shear strength of walls with opening. The results show fair agreement with test results.

摘要

在这项研究中，给出了八个粘土砖墙的测试结果。墙壁在分布的垂直荷载和逐渐增加的横向荷载下进行了测试。墙由一堵实心墙、两堵控制墙和五堵开孔墙组成，使用以下方法加固：开孔周围的 RC 框架、过梁延伸到墙端的 RC 框架、开孔周围的槽钢框架、限制墙带有 RC 框架和近表面安装的杆。结果表明，与未加固的墙体相比，所有加固技术都提高了侧向承载能力、延展性和韧性。抗剪强度增幅最大的是开孔周围用钢架加固的墙，增幅为 88%，其次是用 NSM 钢筋加固的墙，增幅为 56%。根据荷载挠度曲线计算荷载过程中墙体耗散的能量。与控制墙相比，具有内部钢框架、外部限制、内部 RC 框架的墙的能量耗散增加最多，分别为 470%、268% 和 250%。提出了基于现有方程的抗剪强度计算，并提出了一种预测开洞墙侧向抗剪强度的解析模型。结果显示与测试结果相当一致。并提出了一种预测开孔墙侧向抗剪强度的分析模型。结果显示与测试结果相当一致。并提出了一种预测开孔墙侧向抗剪强度的分析模型。结果显示与测试结果相当一致。