Research on Seismic Performance of an Innovative Upper-Lower Half-Story Precast Shear Wall

Yanyan Sun,Zhenbo Wang,Jing Xu,Minghui Li

doi:10.1155/2021/5519575

Abstract

An innovative precast connection (the precast connection installed in the middle of the shear wall) was proposed for the shear wall. To verify the effectiveness of the proposed precast connection, two cast-in-situ shear walls (RCW1 and RCW2) and three precast shear walls (PCW1, PCW2, and PCW3) were manufactured and investigated. The construction joints were inserted in the bottom and the middle for RCW1 and RCW2; and the structural glue horizontal connection, structural glue cogged connection, and cast-in-situ plug grouting connection were utilized for PCW1, PCW2, and PCW3, respectively. The failure mode, loading capacity, ductility, stiffness degradation, and energy dissipation of specimens were analyzed under the horizontal low-frequency cycled loading. Simultaneously, a numerical simulation was carried out on the ABAQUS software, and simulation results were consistent with experimental results. The result showed that the moment-shear failure occurred in all the specimens except PCW1; the bottoms of PCW2 and PCW3 were still vulnerable regions. The bearing capacity and the ductility of RCW2 were improved to different degrees by installing the construction joint in the middle of the shear wall. Specifically, the structural glue cogged connection and the cast-in-situ plug grouting connection have no obvious effect on the reduction of bearing capacity but can improve the ductility of the specimen; the stiffness degradation and energy dissipation of RCW1, RCW2, PCW2, and PCW3 were basically the same.

Highlights

With the rapid increase of environmental awareness in the construction process and the requirements of high-speed urbanization [1, 2], the precast concrete structure has been gradually accepted, even in some regions with high seismicity (e.g., Japan, Chile, China, and Zealand)
Chu et al [10] conducted six large-scale model experiments under the cyclic lateral loading, including five novel shear wall specimens built with precast concrete hollow mold (PCHM) and a cast-in-situ shear wall. e results indicated that with the width decrease of horizontal cracks, the axial compression ratio increased and the shear span ratio decreased, in which the initial stiffness was significantly strengthened and the slipping deformation was restricted in the bottom
The results of finite element models of PCW2 and PCW3 are analyzed. e main conclusions are drawn as follows: (1) e moment-shear failure is observed in RCW1, RCW2, PCW2, and PCW3, while the severe slippage failure is observed in PCW1

Summary

Introduction

With the rapid increase of environmental awareness in the construction process and the requirements of high-speed urbanization [1, 2], the precast concrete structure has been gradually accepted, even in some regions with high seismicity (e.g., Japan, Chile, China, and Zealand). E results indicated that the integration shear wall and the shear wall with the ceramsite concrete infilling have a better shear bearing capacity, stiffness, energy dissipation, and reliable seismic performance. Li et al [7] prepared three T-shaped partly prefabricated reinforced concrete shear walls and one cast-in-situ shear wall and performed experimental tests on the connection of components under the low-frequency loading. E test results showed that in terms of failure modes, bearing capacity, energy dissipation, and load-lateral drift hysteresis curves of specimens, the precast concrete shear walls have significant seismic behaviors and are comparable to the cast-in-situ shear walls. The left-right sides of precast concrete shear walls were embedded in hidden columns with the cast-in-situ reinforced concrete Both the seismic performances and finite element analysis were conducted in this investigation

Experimental Investigation

Experimental Result and Discussion

Findings

Conclusion