《外贴玻璃纤维框架节点抗震性能试验研究 Seismic Performance of Repaired BC Joint》.pdfVIP

Seismic Performance of Strengthened Reinforced Concrete Beam-Column Joints Using FRP Composites Bing Li1 and H. Y. Grace Chua2 Abstract: Three nonseismically detailed interior reinforced concrete beam-column joints, namely, one eccentric and two concentric joints, strengthened with proposed ?ber-reinforced polymer FRP wrapping con?gurations using glass ?ber-reinforced polymer and carbon ?ber-reinforced polymer strips and sheets, were tested under constant axial compression load and reversed cyclic loading which simulated low to moderate earthquake forces. Seismic performance of the strengthened beam-column joints in terms of their hysteresis response, stiffness, and energy dissipation capacity is evaluated and compared to those of the original and unstrengthened beam-column joints. Results indicate that applying strips at 45o on a ?ushed eccentric joint core and as cross bracing on the beam and con?nement round the column is very effective. All specimens failed with gradual strength deterioration, bond degradation, and debonding of FRP sheets was observed near the joint core. The proposed strengthening schemes were found to be ef?cient and economical for mass repair or upgrading of nonseismically detailed structures. DOI: 10.1061/ASCE座机电话号码135:101177 CE Database subject headings: Reinforced concrete; Beam columns; Joints; Seismic effects; Fiber reinforced polymers. Introduction Gergely et al. 1998, Clyde and Pantelides 2003, Ghobarah and Said 2002, El-Amoury and Ghobarah 2002, Tsonos and Styl- In low to moderate seismicity regions, such as Singapore, which ianidis 2002, Karayannis and Sirkelis 2002, and Antonopoulos has a peak ground acceleration of about 0.1 g with a 10% prob- and Trianta?llou 2003 on the repair and strengthening of non- ability of exceedance in 50 years and many other parts of Asia seismically designed RC beam-column joints with FRP compos- and Europe, engineers do not normally include seismic