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배백일 ( Bae Bask-il ),박병규 ( Park Byung-kyul ),최현기 ( Choi Hyun-ki ),최창식 ( Choi Chang-sik ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1
In case of construction of mass concrete structure, there are a lot of possibilities that temperature cracks due to occurred constraint. The hydration heat that was produced in the process of concrete hardening resulted in occurrence of temperature stress on a structure and in some cases. It could cause cracks on a structure and frequently has significant effect on usage and waterproof duration. The occurrence aspect of these temperature cracks can change from how a structure construct. The object of this study is to decide the most suitable thickness which can make a crack be minimized. In this study, therefore, results of hydration heat analysis to a mass concrete structure is compared. Unreinforced masonry buildings have significant portion of existing and historical buildings around the world. Recent earthquakes have shown the needs of seismic retrofitting for these types of buildings. There are many types of retrofitting materials for URM(unreinforced masonry buildings) such as shotcrete, ECC and FRPs. Many engineers use mahy types of fiber reinforced polymers because this types of material enhance the shear strength of wall without expansion of wall sectional area and additional weight of total structure. However, the complexity of mechanical behavior of masonry shear wall and the lack of experimental data of masonry wall which was retrofitted by FRPs may cause the problem that engineers hard to determine the retrofitting level. Determining and providing the information for retrofitting effect of FRPs for masonry shear wall, this paper investigate in-plane shear behavior of URM and retrofitted masonry shear walls using two types of different FRP materials. Specimens were designed to idealize the wall of low rise apartment which was built in 1970s Korea with no seismic reinforcements and have 1 aspect ratio. Three materials were carbon FRP and Hybrid sheet which have different elastic modulus and ultimate strain. Consequently, this study will evaluate the structural capacity of masonry shear wall and retrofitting effect of FRP sheet for in plane shear behavior comparing with evaluation method for reinforced concrete beam which was retrofitted by FRPs.
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