Abstract
A new type of prefabricated reinforced concrete‐Y‐shaped eccentrically steel brace structure (PRC‐Y‐ESBS) is developed by combining the mechanical property of prefabricated reinforced concrete frame and Y‐shaped eccentrically steel brace, so the seismic performance and seismic resilience capacity of prefabricated reinforced concrete frame can be effectively improved. In the PRC‐Y‐ESBS, the precast concrete beam‐to‐shear link composite connection should have enough bearing capacity and resilience capacity under the shear force and bending moment, so the damage can be restricted in shear links. In this paper, an innovative precast concrete beam‐to‐shear link composite connection (PCB‐SLCC) with bending moment and shear force separate method is proposed. Four different types of shear connectors are analyzed in detail by using the verified numerical method, and the shear capacity and failure mode of shear connectors can be obtained. Then, the innovative PCB‐SLCCs with the reasonable shear connector considering different influencing parameters are also studied in detail. The results indicate that the shear connectors and high‐strength bolts are still in elastic state at ultimate load, and little damage has occurred in the concrete between the embedded plate and precast concrete frame, while the PCB‐SLCC has enough bearing capacity at the ultimate stage. In addition, this study also clearly identifies that high‐strength bolts can only bear the bending moment, and the shear force is only carried by shear connectors, so the bending moment and shear force of the innovative PCB‐SLCC with high bearing capacity, ease of installation, and seismic resilience capacity can be apparently separated.
Highlights
Based on the three-level earthquake resistant design [1] and the fifth-generation seismic ground motion parameter zonation map of China [2], a four-level seismic fortification objective of earthquake resilient structures and higher seismic performance was proposed [3]
Previous studies have shown that the lateral stiffness, bearing capacity, and seismic performance of concrete frame structure can be effectively improved by combining the shear link and eccentrically steel brace [12]
Based on the typical numerical analysis, the reliability of the parametrical analysis was confirmed, and the following conclusions could be drawn: (1) Compared with the linear-type, cross-type, and channel-type shear connectors, the CB-type shear connector can significantly enhance the ultimate shear capacity and reduce the slip displacement during the push-out analysis, and it is recommended to be used in the PCB-SLCC
Summary
Based on the three-level earthquake resistant design [1] and the fifth-generation seismic ground motion parameter zonation map of China [2], a four-level seismic fortification objective of earthquake resilient structures and higher seismic performance was proposed [3]. Previous studies have shown that the lateral stiffness, bearing capacity, and seismic performance of concrete frame structure can be effectively improved by combining the shear link and eccentrically steel brace [12]. In order to realize the seismic resilience, it is imperative to develop a new precast concrete beam-to-shear link connection, which can be easy to install and quickly repaired, so the earthquake damage to the PRC-Y-ESBS will be transferred from the main components to the very short shear links. Based on seismic resilient capacity and damage control theory, an innovative precast concrete beam-to-shear link composite connection (PCB-SLCC) with bending moment and shear force separate method is firstly proposed. Shear connectors and high-strength bolts will play a key role in transferring the shear force and the bending moment between precast concrete beam and very short shear link, when subjected to rare earthquake events. Shear connectors and high-strength bolts will play a key role in transferring the shear force and the bending moment between precast concrete beam and very short shear link, when subjected to rare earthquake events. e shear force transferred from the very short shear link to PCB-SLCC is delivered to the shear plates and carried by the shear
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