Seismic Behavior of Reinforced Concrete Frame with New CFRP Units Infilled Wall

Abstract

Institute of Technology, Shimizu Corporation, 3-4-17, Etchujima, Koto-ku, Tokyo 135-8530, JAPAN; PH +81-3-3820-6644; FAX +81-3-3820-5959; email: tateishi_yasutoshi@shimz.co.jp Institute of Technology, Shimizu Corporation, 3-4-17, Etchujima, Koto-ku, Tokyo 135-8530, JAPAN; PH +81-3-3820-8509; FAX +81-3-3820-5959 Advanced Composites Center, Toray Industries, Inc., 9-1, Ohe, Minato-Ku, Nagoya, 455-8502, JAPAN; PH +81-52-613-5986; FAX +81-52-613-5963 Technical Design Dept, Toray Construction Co. LTD, 3-3-16, Nihonbashi Motoishi-Cho, Chuo-Ku, Tokyo 103-0021, JAPAN; PH +81-3-5205-3869; FAX +81-3-5205-3870 ABSTRACT New infill units made of the Carbon Fiber Reinforced Polymer (CFRP) have been developed for one of the seismic retrofit technologies. The CFRP shear wall consisted of the CFRP units by epoxy resin bonding. The thickness and the weight of the wall are about 100mm and 4l kg/m. As for the connections between CFRP shear wall and existing concrete, boundary steel plates are installed with epoxy resin. Three types of reinforced concrete frames with CFRP shear walls were tested under axial and cyclic lateral loads. The parameters of the specimens were anchorage bond strengths and with/without splice plates on unit joints. From the test results, the average shear strength of CFRP shear wall was over 3.5 N/mm without splice plates and over 6.4 N/mm with splice plates. These values can be enough for the strength of seismic rehabilitation. As for the ductility, the story drift of the wall without splice plates was 0.26 %, that with splice plates 0.74 %. In the additional case of slipping along the anchorage connection, the story drift of the specimen with splice plates was about 2.0 %. From the viewpoints of strength and ductility, the CFRP shear walls with splice plates are better suited for the strength resistant type of seismic rehabilitation. INTRODUCTION Post-installed infills such as reinforced concrete shear walls and framed steel braces are commonly used as seismic rehabilitation of reinforced concrete frames. By ordinary a lot of post-installed anchors are used for connections to existing concrete. The concrete works and the steel-frame works shall generate noise, 1105 ATC & SEI 2009 Conference on Improving the Seismic Performance of Existing Buildings and Other Structures