ABSTRACT

Historic masonry buildings often require structural repair or retrofit to attain a satisfactory level of seismic resistance. This paper analyses the effect of externally bonded fibre-reinforced polymer (FRP) retrofitting systems on the global seismic response of such buildings in order to achieve the fundamental code-based requirements that refer to the structure’s state of damage for a specified limit state. As a case study, a three-storey historic unreinforced masonry (URM) building was selected. The first part of the paper presents an FRP design procedure for determining which vertical structural elements should be retrofitted and to what extent. As a result, six different FRP retrofitting layouts have been selected and analysed with the aid of non-linear static analyses in the second part of the paper. The paper concludes with a cost-feasibility study by introducing a cost-effectiveness index for FRP reinforcement that identifies the effectiveness of an FRP layout by accounting for the amount of retrofitting material used and comparing it with its effectiveness in improving the global seismic resistance.

摘要

历史悠久的砖石建筑通常需要结构维修或改造才能达到令人满意的抗震水平。本文分析了外部粘合纤维增强聚合物 (FRP) 改造系统对此类建筑物的全球地震响应的影响，以实现基于规范的基本要求，即在特定极限状态下结构的损坏状态。作为案例研究，我们选择了一座历史悠久的无筋砖石 (URM) 建筑。本文的第一部分介绍了一个 FRP 设计程序，用于确定哪些垂直结构元件应进行改造以及改造程度。因此，本文第二部分借助非线性静力分析选择和分析了六种不同的 FRP 改造布局。