STATE OF THE ART: RESEARCHES AND APPLICATIONS OF FRP IN CIVIL ENGINEERING IN CHINA
L. P. YE, P. FENG, K. ZHANG, L. LIN AND W.H. HONG Department of Civil Engineering, Tsinghua University Beijing 100084, China Q.R. YUE, N. ZHANG AND T. YANG National Engineering Technical Technique Research Center of Industrial Building Beijing 100088, China This paper summarizes the researches and applications of FRP in civil in China. It includes structure strengthening with FRP sheet and plates, reinforced concrete structures with FRP bars and tendons, pure FRP structures and bridges, FRP-concrete composite structures and self-monitoring using CFRP. The code of FRP application in civil engineering, which is under editing, is also introduced. The future research topics and projects in China are prospected.
INTRODUCTION The first research of FRP in civil engineering in China, as the authors known, was a fatigue test of a T section the hanging bridge beam, 6000mm span and 1000mm height, reinforced with GFRP bars made in Tsinghua university in 1958. The propose of the test was intend to use GFRP bars to instead of steel bars due to that there was limit amount of steel in that years in China. But the beam failed in very brittle style with a sudden rupture of GFRP bars, so that the research was not continued. From 1970s, there were some research institutes in China began the research on the GFRP bridge and there were some GFRP bridges were built. Besides, there some researches and application of GFRP water tanks for buildings. But it was until the late of 1990s that the FRP was found its popular application in civil engineering in China when the external bonded techniques of structure strengthening using CFRP sheets became accepted in Chinese civil engineering. And after that, the Chinese engineers began to acknowledge merits of the new building material of FRP, and the researches of FRP in civil engineering in China became more and more since then. In 1998, a committee of FRP and application was founded in Association of Chinese Civil Engineering (ACCE). Under the organization of committee, a series research projects were undertaken. This paper introduce the state-of-the-art of the researches and application of FRP in civil engineering in China. STRUCTURE STRENGTHENING RC Structures Same as the other countries, the most application of FRP in civil engineering in China is the RC structure strengthening using external bonded CFRP sheets or plates. The first test and application was in 1997, which was conducted by National Engineering Technique Research Center of Industrial Building (NETRCIB). After that, many researches on this new technique were taken out in China. From 1997 to 1999, the researches were mainly to demonstrate the effectiveness of the strengthening method. Under the support of Chinese Science and Technology Bureau, a series of experimental researches on flexural strengthening of RC beams and slab, shear and seismic strengthening of RC columns were conducted in Tsinghua university and NETRCIB to established the design method for the RC structure strengthening with CFRP sheets and plates. The design method was established based on the Chinese design approaches of RC structures, i.e., the limit state design philosophy was adopted. The contribution of CFRP to the strength of RC members was determined by its strain development at the corresponding limit state and a maximum allowing strain for CFRP, equal to 2/3 rupture strain of CFRP sheet and plate, is limited considering the elastic brittle material behavior of CFRP. Figure 1 is the test photo of RC bridge slab strengthened with CFRP sheet under sustaining load. The flexural strengthening with bottom bonded CFRP sheets showed that the plane section assumption

下一页