The Development of a New Fiber Reinforced Paint for Seismic Retrofitting of Masonry Structures

Abstract eng:
We have seen a large number of fatalities attributed to earthquakes in the 20th and 21st centuries, and more than 60% of the fatalities have been caused due to the collapse of masonry buildings. These masonry buildings, that have killed many people, made by weak materials like adobe, rubble stone, rammed earth, unreinforced fired brick, and concrete blocks, that can collapse even at low intensities of ground shaking [1]. To save the people living in masonry buildings, many kinds of techniques to seismically retrofit the masonry buildings were developed. However, a large number of fatalities were still caused by the collapse of masonry in recent earthquakes around the world. It means the knowledge of the retrofitting techniques have not been spread in the countries where people still use masonry for housing. This is because most techniques require much time and labor work, and they need incentive to pay only for the value of seismic retrofitting. To solve these problems, a new technique was introduced. SG-2000, which is a kind of paint mixed with glass fibers and invented by SG Co., was used for retrofitting. This technique involves only coating the masonry building with the SG-2000. Therefore, the time and labor required for retrofitting is considerably reduced. Furthermore, the SG-2000 can be introduced as a form of painting, which adds aesthetic approval to the masonry buildings. The past shaking table test has shown that the house retrofitted with SG-2000 has large deformability and good energy dissipation capacity. SG-2000 had prevented the dust produced by the mortar in the joint of bricks, from spreading, which avoid the suffocation of the residents during earthquake shaking. It has also prevented the bricks from falling down, which prevents fatal injuries to the people living inside [2]. However, the level of damage to masonry walls inside the coating of SG-2000 is similar to that of masonry walls of an unreinforced masonry house, because SG-2000 does not improve the initial stiffness of the house. Therefore, it is impossible for the residents to use the house retrofitted with SG-2000 after a large earthquake even if it saves their lives. To solve this problem, the retrofitting needs to improve not only the deformation capacity but also the strength of masonry buildings, through the composite use of two kinds of retrofitting material can increase both of masonry buildings [3]. Therefore, two kinds of paint are needed for this purpose. The normal SG-2000 improves the deformation capacity of buildings, so the paint which increases the strength of buildings is needed. In this research, we conducted tensile tests using SG-2000 whose resin and ratio of fiber is changed to develop a new type of SG-2000 which improves the strength of buildings. Tensile tests of the new SG-2000 and in-plane tests are conducted using the composite use of the new SG-2000 and previously used SG-2000.

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