Experimental Research On Seismic Behavior Of Frame Beam-Column Joint Strengthened By Prestressed Bolt

It is a new reinforced method with stretching high-strength bolt and make joint corezone compressive by angel steel. In this paper its effect on strengthening shear capacityof reinforced concrete frame joint is studied, and the effectiveness of this reinforcedmethod is presented. And in order to know the effect and influencing factor of thistechnology clearly, in this paper the reinforced concrete beams strengthened with thismethod is studied at first. The program includes such experimental researches asfollows:1. Experimental research on shear capacity of reinforced concrete beams with the method This paper studied the performance of seven beams enclosed withprestressed bolt under static loading, verified its validity, and so laid afoundation for the reinforcement of the joint. The experimental researchindicates the method can advance effectively the cracking load and shearcapacity on the base of the rational analysis, a simplified design formula isproposed and it can meet the experiment.2. Experimental research on seismic behavior of frame joint strengthened with the method The seismic behavior of four specimens of strengthening framebeam-column joints enclosed with prestressed bolt is studied under cyclicloading, proofed this method is effective, and make a base for its practice. Theexperiment conclude: it is very effective for improve the crack resistance,shear capacity and seismic behavior of frame joint reinforced with this method.So this method is valid which can be used in practice. The design formula ofshear capacity is proposed; the calculated value can meet the experiment value,and it can satisfy actual engineer designing. Finally some design suggestionput forward in this paper, which can meet the engineering requirements.3. Moment technology on frame beam-column joint strengthened with the method Because of lots of questions in the procedure of using this method, it takesa long term observed result about beam and joint is studied and inference theformula and last lost value. It would establish the fundaments for actualapplication.