ABSTRACT

Several conventional rehabilitations and strengthening techniques are available depending on the purpose required for unreinforced masonry (URM) walls. Carbon Fiber Reinforced Polymer (CFRP) retrofitting is one of these techniques which increases the shear capacity and overall post-strengthening performance of the walls. This study aims to experimentally explore shear behavior of URM walls with openings that were strengthened by CFRP strips. For this purpose, five solid clay brick masonry wall specimens having a central opening with dimensions of 315 × 230 mm were fabricated and then strengthened using double-sided diagonal CFRP strips with different thickness and surface area. All these specimens were tested under combined in-plane monotonic lateral load and constant axial load. It was concluded that for a given FRP reinforcement amount, a single-layer four-strip configuration results in slightly higher shear strength when compared with a double-layer two-strip configuration. Furthermore, in-plane shear strength of CFRP strengthened URM walls with opening was also estimated by existing analytical models in the literature.

摘要

根据无钢筋砌体 (URM) 墙的用途，可以使用几种传统的修复和加固技术。碳纤维增强聚合物 (CFRP) 改造是这些技术之一，可增加墙的剪切能力和整体后加固性能。本研究旨在通过实验探索具有由 CFRP 条加固的开口的 URM 墙的剪切行为。为此，制作了五个中心开口尺寸为 315 × 230 mm 的实心粘土砖砌体墙体试件，然后使用不同厚度和表面积的双面对角 CFRP 条进行加固。所有这些试样都在平面内单调横向载荷和恒定轴向载荷下进行了测试。得出的结论是，对于给定的 FRP 加固量，与双层两带结构相比，单层四带结构的剪切强度略高。此外，还通过文献中现有的分析模型估计了带开口的 CFRP 加固 URM 墙的面内抗剪强度。