Vol.13, No.2 EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION June, 2014Earthq Eng frame-shear wall; concealed bracings; shaking table test; nonlinear time-history response analysisCorrespondence to: Cao Wanlin, College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China Tel: +86-10-67392819; Fax: +86-10-67392819 E-mail: wlcaobjut.edu.cnProfessor ; Master Student; Associate Professor Supported by: National Science and Technology Support Program of China under Grant No. 2011BAJ08B02; Natural Science Foundation of Beijing under Grant No. 8132016; Beijing City University Youth Backbone Talent Training Project under Grant No. PHR201108009 Received January 10, 2013; Accepted November 1, 20131 Introduction In recent years, the Chinese building industry has been in a high speed development period. The demand of concrete results in the use of an extremely large amount of aggregates, and the excessive exploitation of natural sand and stone yielded serious damage to the environment. Meanwhile, significant volumes of construction waste were generated by demolition, renovation, and collapse of old buildings. It was estimated that approximately 200 million tons of waste concrete is currently produced annually in mainland China (Xiao et al., 2012). Making efficient use of this waste concrete from construction has become an urgent task for sustainability. One effective way to deal with waste concrete is to use it as aggregate to produce recycled concrete (Tam, 2009). Recycled concrete uses aggregates made from waste concrete which has been broken, classified and washed to partly or entirely replace natural aggregates, per Chinese Technical Code JGJ/T240-2011 (2011). Currently, the experimental studies on recycled concrete mainly focus on its material properties (Xiao et al., 2005; Xiao and Falkner, 2007; Tabsh and Abdelfatah, 2007; Casuccio et al., 2008; Beln et al., 2011). The studies on basic mechanical properties and seismic performance of recycled concrete structural members have made some progresses, such as the flexural behavior and shear capacity of beams (Xiao and Lan, 2006; Ajdukiewicz and Kliszczewicz, 2007; Sato et al., 2007; Fathifazl et al., 2011), compression behavior and seismic performance of columns (Xiao et al., 2006; Ajdukiewicz and Kliszczewicz, 2007; Bai et al., 2011) , seismic behavior of beam-column joints (Xiao and Zhu, 2005; Corinaldesi et al., 2011) , seismic behavior of shear walls (Cao et al., 2010a; Zhang et al., 2010), seismic behavior of frames (Sun et al., 2006), and seismic behavior of frame-shear wall structures (Cao et al., 2010b). However those experimental studies were carried out by means of static tests. There are only a few studies on the dynamic performance of recycled concrete structures. This paper presents the results of an experimental investigation of the dynamic performance of recycled concrete frame-shear wall structure through the use of shaking table tests. Four frame-shear wall 258 EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION Vol.13structures were tested, and the research focuses on the influence of different recycled aggregate replacement ratios and concealed bracings.2 Experimental details2.1 Test specimens and test set-upFour 1/5 scaled frame-shear wall models were labeled as FSW-0, FSW-1, FSW-2, and FSW-3. FSW- 0 was made of normal concrete. FSW-1 was made of recycled coarse aggregate concrete. FSW-2 and FSW-3 were made of recycled coarse and recycled fine aggregate concrete. FSW-3 had reinforced concrete concealed bracings inside the shear walls (Cao et al., 2003, 2009). The beam was designed as a T-section in order to consider the concrete floors contribution to the beam stiffness. The cantilever length on both sides was six times the floor thickness. The specimens all had the same dimensions and reinforcement layout. FSW-3 had concealed bracings inside the shear walls and the others did not. The dimensions and reinforcement layout of FSW-3 are shown in Fig. 1. 8 steel bar was used for the longitudinal reinforcement of the concealed columns and concealed bracings in the shear wall as well as the frame columns. 6 steel bar was used for the longitudinal reinforcement of the frame beams. 4 galvanized iron wire was used for the stirrups of the columns, concealed bracings, beams, and the distributing bars in shear walls. The mechanical properties of the steel bar are listed in Table 1. The waste concrete was from a shopping mall demolition project in the Xidan area of Beijing, and the original concrete strength grade was C20. The test specimens were made by fine stone concrete and the maximum grain size of the coarse aggregate was 10 mm. The designed concrete strength grade for the specimens was