Experimental Analysis of Seismic Performance of Masonry Shear Wall Reinforced with PP-Band Mesh and Plastering Mortar under In-Plane Cyclic Loading

Qiang Zhou,Wenyang Zhao,Lingyu Yang

doi:10.1155/2020/4015790

Abstract

Masonry structures are widely used in developing countries due to their low cost and simple construction, especially in remote areas, where there are a large number of houses without seismic measures. These buildings are prone to collapse and cause a lot of casualties, even under the action of small earthquakes. For the reinforcement of this structure, a cheap, effective, and easy-to-construct reinforcement method is urgently needed. Therefore, this article studies the reinforcement method of polypropylene bands (PP-bands). We have carried out low-frequency cyclic loading tests for two PP-band reinforced masonry walls and two compared masonry walls. We mainly studied the influence of PP-band and different compressive strengths of plastering mortar on the masonry wall’s seismic capacity. The seismic indicators mainly studied in this article include ultimate bearing capacity, energy dissipation capacity, stiffness degradation, and hysteresis characteristics. The experimental results show that the PP-band can greatly enhance the seismic capacity of the masonry wall. The ultimate bearing capacity, energy dissipation capacity, and displacement ductility of the PP-band reinforced wall are increased by 38%–48%, 22%–47%, and 138%–226%.

Highlights

Masonry structure is widely used in developing countries
Many methods have been proposed for the reinforcement of masonry structures, such as reinforced concrete mortar layer and vertical reinforcement, external posttensioned technique, and external FRP reinforcement methods [4,5,6,7,8,9,10,11,12,13]. ese methods are applied in many reinforcement projects
Because the high professional knowledge and expensive cost are required for its reinforcement method, it has some limitations for reinforcing the masonry buildings in economically backward areas

Summary

Introduction

Masonry structure is widely used in developing countries. Due to its heavyweight and brittleness, it is easy to collapse under the action of the earthquake, which causes a large number of casualties and property losses [1]. E experimental results show that, in diagonal compression tests, the retrofitted walls achieved 2.5 times larger strengths and 50 times larger deformations than those of nonretrofitted walls. Sathiparn et al [19, 20] carried out a series of simple harmonic shaking table tests for masonry buildings reinforced by PP-band. In 2010, Sun et al and Zhou et al [21, 22] carried out the shaking table test in a real sense to study the impact of the PP-band reinforcement on masonry structures’ seismic capacity. Saleem et al [23] carried out the shaking table test by using the method of joint reinforcement of FRP and PP-band. E effects of PP-band reinforcement and different compressive strength of plastering mortar on the seismic performance of masonry walls are studied.

Mechanical Properties of Materials

Unreinforced Specimen Failure Process

PP-Band Reinforcement Specimen Destruction Process