Beam-column joint with grooved steel sheets for recycled concrete
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Solution Overview
Problem
The existing design of reinforced concrete beam-column joints faces challenges in incorporating large-size demolished concrete lumps due to reinforcement congestion, which hinders construction efficiency and seismic performance.
Innovation Solution
A reinforced compound concrete beam-column joint design that uses steel strip stirrups and grooved connection sheets to constrain column reinforcements, allowing for the incorporation of large-size demolished concrete lumps while ensuring a strong column-weak beam failure mode through manually reduced steel bar diameters, enhancing seismic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam longitudinal reinforcements pass through the joint to achieve strong column-weak beam failure mode, then seismic performance is improved, but reinforcement congestion occurs making it difficult to pour large-size demolished concrete lumps
Solution Approach 1:
The patent extracts the beam longitudinal reinforcement from passing through the joint by introducing steel connection sheets with grooves that intercept and redirect these reinforcements. The grooves are positioned to receive the beam longitudinal reinforcements and prevent them from entering the joint, thereby solving the reinforcement congestion problem while maintaining the strong column-weak beam failure mode through alternative connection methods.
Solution Approach 2:
The steel connection sheets with grooves serve as an intermediary element between the beam reinforcement and the joint. These sheets are arranged in the joint region to mediate the connection, allowing beam longitudinal reinforcements to be connected to column reinforcements without actually passing through the joint volume, thus enabling concrete pouring while maintaining structural integrity.
2Productivity
If large-size demolished concrete lumps are used to simplify recycling process, then construction efficiency is improved, but reinforcement congestion prevents proper placement into joint and column
Solution Approach 1:
The patent removes the problematic beam longitudinal reinforcements from the joint region by using steel connection sheets with grooves to intercept and redirect them. This extraction creates clear space within the joint and column, eliminating the reinforcement congestion that previously prevented the placement of large-size demolished concrete lumps.
Solution Approach 2:
The connection system is segmented into multiple components: steel connection sheets with grooves, steel strip stirrups, and short steel bars with threads. This segmentation allows each component to perform a specific function, with the grooved sheets handling the beam reinforcement redirection and the stirrups providing lateral约束, thereby simplifying the overall placement process for large concrete lumps.
3Strength
If traditional reinforced concrete joint design is used, then structural strength is maintained, but environmental friendliness and energy saving are compromised due to inability to use recycled waste concrete
Solution Approach 1:
The patent changes the geometric parameters of the connection system by introducing grooves in the steel connection sheets and using short steel bars with specific thread configurations. These parameter changes enable the accommodation of large-size demolished concrete lumps while maintaining the required joint strength through optimized reinforcement distribution and connection mechanics.
Solution Approach 2:
The joint employs a composite construction approach combining traditional reinforced concrete with recycled demolished concrete lumps. The steel connection sheets, stirrups, and short steel bars create a composite reinforcement system that works together with the recycled concrete aggregates to achieve both environmental benefits and structural strength.
Data Source
AI summary
A reinforced compound concrete beam-column joint containing demolished concrete lumps and a construction method are disclosed. The steel strip stirrups configured to constrain column longitudinal reinforcements of the reinforced compound concrete column containing demolished concrete lumps and the steel connection sheets with grooves are arranged in joint at positions of the upper and lower beam longitudinal reinforcements of the reinforced compound concrete beam containing demolished concrete lumps. The steel strip stirrups abut against the column longitudinal reinforcements. The steel connection sheets are welded to the steel strip stirrups. One end of the short steel bars with threads at one end is welded into the grooves of the steel connection sheets, and the other end is connected to the beam longitudinal reinforcement via a steel sleeve. The joint prevents the beam longitudinal reinforcements from passing through the joint and thus causing reinforcements congestion.