Seismic-Resistant PC Column Beam Joint Using Steel Bracket
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Solution Overview
Problem
Existing seismic-resistant joint structures for precast concrete (PC) columns and beams face challenges such as increased construction time, complexity in joint structures, and the risk of accidents due to external impacts.
Innovation Solution
A seismic-resistant joint structure utilizing a steel bracket that is installed on the PC column to mount the PC beam, employing a bolt fastening method to simplify the joining process, reduce construction time, and enhance structural stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a PC beam is simply mounted on a PC column using traditional methods, then construction time is reduced, but the structure becomes vulnerable to external impacts and accidents
Solution Approach 1:
A steel bracket is introduced as an intermediary component between the PC column and PC beam. The bracket includes a coupling plate that connects to the column and a seating plate that supports the beam, creating a stable intermediate structure that prevents direct vulnerability while maintaining construction efficiency
Solution Approach 2:
The joint structure combines different materials: steel bracket (metal) with precast concrete components. This composite approach leverages the strength and ductility of steel to enhance seismic resistance while maintaining the precast concrete construction method's time advantages
2Reliability
If a complex joint structure is used to prevent external impacts, then structural stability is improved, but construction complexity and finishing work increase
Solution Approach 1:
The steel bracket is divided into distinct functional segments: a coupling plate for connecting to the column, a seating plate for supporting the beam, and guide parts for alignment. This segmentation allows each component to perform its specific function simply, reducing overall complexity while maintaining stability
Solution Approach 2:
The bracket design includes self-aligning features such as guide parts that automatically position the beam during installation, and a step part that provides built-in positioning. These self-service features eliminate the need for complex alignment procedures and reduce finishing work
3Ease of manufacture
If traditional bolt fastening methods are used for PC beam and column connection, then construction simplicity is maintained, but seismic-resistant performance is insufficient
Solution Approach 1:
The steel bracket is pre-assembled with the PC column before beam installation. The coupling plate is preliminarily fixed to the column, and the seating plate is positioned in advance, so that when the beam is installed, the connection can be completed quickly with simple bolt fastening while achieving seismic performance
Solution Approach 2:
The bracket design changes the geometric parameters of the connection interface through the seating plate and guide part configuration. This creates a larger effective connection area and better mechanical interlocking, enhancing seismic performance without complicating the bolt fastening process
Data Source
AI summary
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.