Seismic-resistant joint structure of pc column and pc beam using steel bracket

Abstract

Proposed is a seismic-resistant joint structure of a PC column and a PC beam using a steel bracket, in which a steel bracket is installed on a PC column by protruding therefrom to mount a PC beam to the PC column so that the PC column and the PC beam are simply joined by using a bolt fastening method, thereby reducing construction and finishing work while preventing accidents to shorten a construction period, and enabling the implementation of the performance of an intermediate moment frame or higher.

What is claimed is: 
     
         1 . A seismic-resistant joint structure of a PC column ( 10 ) and a PC beam ( 20 ) using a steel bracket, wherein the PC column ( 10 ) includes a steel bracket ( 30 ) composed of a pair of side plates ( 310 ) having shapes of vertical plates and being spaced apart from each other by a predetermined distance, a coupling plate ( 320 ) having a shape of a vertical plate and connecting end parts of the pair of side plates ( 310 ) to each other, with the coupling plate ( 320 ) having a seating part ( 321 ) cut to have a predetermined width from an upper part thereof downward to a predetermined height, and a seating plate ( 330 ), which has a shape of a horizontal plate, having a longitudinal end part connected to an upper end part of the coupling plate ( 320 ), opposite widthwise end parts connecting upper end parts of the pair of side plates ( 310 ) to each other, and a guide part ( 331 ) formed by being cut at a position corresponding to the seating part ( 321 ) so that the coupling plate ( 320 ) protrudes outward from the PC column ( 10 ), and
 the PC beam ( 20 ) includes a step part ( 210 ) recessed from a lower surface of an end part of the PC beam ( 20 ) connected to the PC column ( 10 ) upward to a predetermined height, and a lower reinforcement bar ( 230 ) arranged in an inner lower part of the PC beam ( 20 ), wherein an end part of the lower reinforcement bar ( 230 ) is exposed a predetermined length from the step part ( 210 ) and the exposed part is threaded, so   the step part ( 210 ) is mounted on the upper part of the steel bracket ( 30 ), and the lower reinforcement bar ( 230 ) of the PC beam ( 20 ) is seated on the seating part ( 321 ) through the guide part ( 331 ) of the steel bracket ( 30 ) to be fastened by a nut ( 360 ) at each of opposite sides of the coupling plate ( 320 ).   
     
     
         2 . The structure of  claim 1 , wherein the step part ( 210 ) is formed by recessing a widthwise central part of the end part of the PC beam ( 20 ). 
     
     
         3 . The structure of  claim 1 , wherein a shim plate ( 410 ) is provided on an upper part of the seating plate ( 330 ) to absorb a vertical installation error. 
     
     
         4 . The structure of  claim 1 , wherein a shim plate ( 420 ) is provided on a joint surface of the PC column ( 10 ) and the PC beam ( 20 ) on the upper part of the steel bracket ( 30 ) to absorb a horizontal installation error. 
     
     
         5 . The structure of  claim 1 , wherein in the coupling plate ( 320 ) and the seating plate ( 330 ), the seating part ( 321 ) and the guide part ( 331 ) respectively include two seating parts or more spaced apart from each other by a predetermined distance and two guide parts or more spaced apart from each other by a predetermined distance, and
 in a lower portion of the seating plate ( 330 ), a reinforcement plate ( 340 ) with a shape of a vertical plate is formed between the guide part ( 331 ) and the guide part ( 331 ) to connect the seating plate ( 330 ) with the coupling plate ( 320 ).   
     
     
         6 . The structure of  claim 1 , wherein an interior of the steel bracket ( 30 ) and space between the steel bracket ( 30 ) and the step part ( 210 ) of the PC beam ( 20 ) are filled with non-shrinkage mortar so that the PC beam ( 20 ) and the steel bracket ( 30 ) are integrated with each other. 
     
     
         7 . The structure of  claim 1 , wherein a coupler ( 50 ) is embedded in a portion above a position at which the steel bracket ( 30 ) is installed in the PC column ( 10 ) so that a first end part of the coupler ( 50 ) is exposed, and
 after an upper reinforcement bar ( 60 ) is arranged in an upper part of the PC beam ( 20 ) so that a second end part of the upper reinforcement bar ( 60 ) is coupled to the coupler ( 50 ) after the PC beam ( 20 ) is coupled to the steel bracket ( 30 ) of the PC column ( 10 ), concrete ( 70 ) is poured in the upper part of the PC beam ( 20 ).