Abstract

Previous earthquakes have proven that failure of framed structure particularly at joints of beam and column caused disastrous collapse in structures that are built without seismic codal provisions. Most of the traditionally built Reinforced Cement Concrete (RCC) framed structures existing are lacking adequate reinforcement at structural joints and these joints are shear deficient. The main objective of the research studies was to enhance behaviour and performances of exterior structural joints by retrofitting and testing for displacement-controlled reversed cyclic loading. The joints retrofitted exhibits higher levels of ultimate displacements, higher levels of ultimate capacity previous to failure and the joints failed prior to failure of column. The variable novelty in research were size and shape of mesh, woven mesh, mesh orientation and wrapping in all direction around joints, cementitious matrix laminates with aggregate chips less than 5 mm, epoxy resin to increase bond between old and new concreting and chicken wire mesh near to cover and displacement controlled reversed cyclic loading was applied to column. The experimental research work indicated that, retrofitting with woven wire mesh strengthening technique will enhance the displacement ductility, stiffness, energy dissipation and strain. Thus the proposed retrofitted method anticipated in predicting the shear strength of joints.

摘要

以前的地震已经证明，框架结构的破坏，特别是在梁柱连接处的破坏，会导致在没有抗震尾线规定的情况下建造的结构发生灾难性的倒塌。大多数现有的传统建造的钢筋水泥混凝土 (RCC) 框架结构在结构接缝处缺乏足够的钢筋，并且这些接缝存在剪切缺陷。研究的主要目的是通过改造和测试位移控制的反向循环载荷来增强外部结构接头的行为和性能。改造后的接头表现出更高水平的极限位移、更高水平的失效前极限承载力以及接头在柱失效之前失效。研究中可变的新颖性是网眼、编织网眼的尺寸和形状，网格定向和围绕接缝的所有方向包裹，骨料碎片小于 5 毫米的水泥基层压板，环氧树脂以增加新旧混凝土之间的粘合，靠近覆盖层的铁丝网和位移控制的反向循环加载应用于柱子。试验研究工作表明，采用编织丝网加固技术进行加固，可以提高位移延性、刚度、耗能和应变。因此，所提出的改造方法有望用于预测接头的剪切强度。试验研究工作表明，采用编织丝网加固技术进行加固，可提高位移延性、刚度、耗能和应变。因此，所提出的改造方法有望用于预测接头的剪切强度。试验研究工作表明，采用编织丝网加固技术进行加固，可以提高位移延性、刚度、耗能和应变。因此，所提出的改造方法有望用于预测接头的剪切强度。