EFFECTS OF VARIATION OF AXIAL LOAD AND BI-DIRECTIONAL LOADING ON THE FRP RETROFIT OF EXISTING B-C JOINTS
Most of the experimental studies on the seismic assessment and retrofit of existing, poorly detailed, beam-column joints have typically concentrated on the 2-dimensional (2D) response, based on uni-directional cyclic loading testing protocol under constant axial load. However, in order to obtain a more realistic understanding of the behavior of deficient exterior beam-column joints prior and after retrofit intervention, consideration of the 3-dimensional (3D) response under a) bi-directional and b) varying axial loads are necessary. In this contribution, these two effects on the assessment and retrofit of exterior beam-column joints using GFRP composite materials are discussed. A series of 2/3 scale, 2D and 3D exterior (corner) beam-column joint subassemblies representative of pre-1970s construction practice were tested quasi-statically. Performance-based retrofit approach has been adopted in order to achieve the desired ductile failure mode by modifying the hierarchy of strength within the beam-column joint system. A critical comparison of the existing and retrofitted joints with regard to the observed damage and the global hysteresis behavior are shown, emphasizing the effects of axial load variation and bi-directional loading. The experimental results provided satisfactory confirmations of the efficiency of the proposed retrofit solution, aimed at protecting the panel zone region, while activating a flexural behavior in the beam in order to achieve a more desired weak beam-strong column global inelastic mechanism.
Reinforced Concrete Rehabilitation Fiber reinforced polymers Biaxial tests
U. Akguzel S. Pampanin
PhD Candidate, Department of Civil Engineering, University of Canterbury, Christchurch, NZ Senior Lecturer, Department of Civil Engineering, University of Canterbury, Christchurch, NZ
国际会议
14th World Conference on Earthquake Engineering(第十四届国际地震工程会议)
北京
英文
2008-10-12（万方平台首次上网日期，不代表论文的发表时间）