The increasing demand of housing in urban areas in Latin America has driven the construction of a significant number of buildings using reinforced concrete (RC) walls with thickness equal or lower than 100 mm, with a single layer of reinforcement provided by a welded-wire mesh (WWM) or by deformed bars (DB). Several concerns related to the lack of ductility, scarce evidence on its behavior during earthquakes, and the lack of clarity of design guidelines in earthquake-resistant codes for this structural system have risen in recent years. This research aims at providing evidence on the seismic risk of thin concrete wall buildings reinforced with two types of reinforcement. A six-story building, constructed in Bogotá, Colombia with walls having 100 mm thickness and detailed with WWM is used as case study. After gathering relevant information from the building structural drawings, a nonlinear model was created in OpenSees using the shear-flexure interaction multiple vertical line element (SFI-MVLEM). To evaluate the effect of steel ductility, a second benchmark model of the studied building was created using deformed bars (DB) as reinforcement. Incremental dynamic analyses were conducted on the models using the far field ground motion suite provided by the FEMA P-695 and a set ground motions for subduction zones, which served as input for the development of fragility functions for the building. The results show that the fracture of reinforcing steel is a frequent failure mode of the building reinforced with WWM, whereas the failure of the building reinforced with DB was controlled by the drift limit of the walls. The findings also show that probabilities of failure for the ground motions scaled to the maximum credible earthquake are 41% and 25% for the building reinforced with WWM and DB, respectively. These large probabilities suggest that the use of thin RC walls for mid-rise buildings should be limited in seismic prone areas, especially those detailed with WWM.

拉丁美洲城市地区住房需求的增长驱使大量建筑物使用厚度等于或小于100毫米的钢筋混凝土（RC）墙建造，并通过电焊网提供单层钢筋（WWM）或变形钢筋（DB）。近年来，由于缺乏延展性，关于其在地震中的行为的证据不足以及针对该结构系统的抗震规范中缺乏清晰的设计指导原则，引起了一些关注。这项研究旨在为用两种类型的钢筋加固的薄混凝土墙建筑物的地震风险提供证据。作为案例研究，使用了一个六层楼的建筑，该建筑建于哥伦比亚波哥大，墙厚100毫米，并用WWM进行了详细说明。从建筑物结构图中收集相关信息后，在OpenSees中使用剪切-挠度相互作用的多个垂直线元素（SFI-MVLEM）创建了非线性模型。为了评估钢延展性的影响，使用变形钢筋（DB）作为钢筋创建了研究建筑物的第二个基准模型。使用FEMA P-695提供的远场地面运动套件和俯冲带的设定地面运动，对模型进行了增量动力分析，为建筑物的脆弱性功能的开发提供了输入。结果表明，钢筋断裂是WWM加固建筑的常见破坏方式，而DB加固建筑的破坏是由墙体的漂移极限控制的。研究结果还表明，用WWM和DB加固的建筑物的地震动达到最大可信地震的失败概率分别为41％和25％。这些大概率表明，在地震多发地区，尤其是WWM中详细介绍的那些地区，应限制在中层建筑中使用薄RC墙。