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RISS 인기검색어
- 검색키워드
- 저자 : Zhu Zhangfeng (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Experimental Study on Emulative Hybrid Precast Concrete Shear Walls
Zhu Zhangfeng,Guo Zhengxing 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.1
The reversed cyclic lateral loading experiments were conducted on three, full scale, emulative hybrid precast concrete shear wall specimens with different post-tensioned forces and one reference monolithic RC shear wall specimen, and the measured results were then discussed in this paper. The emulative hybrid wall combined grouted vertical reinforcements with unbonded post-tensioned high-strength multi-strand tendons for lateral resistance, attempting to emulate the cast-in-place RC wall. Because of the presence of the unbonded post-tensioned tendon, by contrast to the monolithic wall specimen, the emulative hybrid wall specimens possessed higher strength, higher stiffness, and smaller residual displacement. The opening gap, resulted from the discontinuity of concrete and the locally debonding of vertical connecting reinforcements, was limited mainly due to the vertical connecting reinforcements across the joint distributed over total cross-section. Meanwhile, the emulative hybrid wall specimens were capable of providing energy dissipation and ductility capacity comparable to that of the monolithic specimen, and the negative effect of the post-tensioned force on energy dissipation was more obvious than on ductility. Moreover, the post-tensioned tendon remained elastic throughout the test and the yielding of the connecting reinforcements was delayed.
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Zhu Zhangfeng,Guo Zhengxing 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.11
An experiment was carried out to investigate the seismic performance of hybrid precast concrete shear walls, which aimed to emulate the monolithic RC wall by incorporating unbonded post-tensioned high-strength strands and vertically connected reinforcing bars by grouting across the horizontal joint for lateral resistance. The unbonded tendons provided the pre-compression and the recentering force. The grouted reinforcing bars were used to provide the bending strength, reduce the gap opening size, and eliminate the horizontal slippage along the joint. Three full-scale emulative hybrid wall specimens under different vertical loads and one monolithic RC wall specimen for reference were subjected to reversed cyclic loading. The test results showed that, the emulative hybrid specimens, with vertical load less than or equal to that of the monolithic specimen, exhibited good lateral performance and the seismic properties, including strength, stiffness, ductility and energy dissipation, were comparable to that of the monolithic specimen. As the vertical load increased, the strength and stiffness were enhanced, however, the energy absorbing capacity was obviously decreased.
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Seismic Behavior of Precast Concrete Shear Walls with Different Confined Boundary Elements
Zhangfeng Zhu,Zhengxing Guo 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.2
To ensure the mechanical property of lapped spliced reinforcement and concrete confinement of boundary elements for precast concrete shears, two kinds of constraints, local constraint by additional spiral stirrups placed around each reinforcement splicing and overall constraint by lapped welding closed stirrups replacing traditional stirrups and ties, were proposed in this paper. Low-cyclic reversed loading tests were conducted on three full scale specimens, including one reference cast-in-situ specimen, one precast concrete specimen with local constraint and one precast concrete specimen with overall constraint. By comparing the aspects of strength, stiffness, ductility and energy-dissipation capacity with that of cast-in-situ specimen, it is found that local constraint and overall constraint can be considered equivalent. However, due to the over restraint by local constraint detail, the specimen with local constraint exhibited earlier yielding, poorer energy-dissipation capacity and better ductility than that with overall constraint. Coupled with the consideration of steel usage and construction simplicity, overall constraint detail should be preferred in practical engineering.
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In-Plane Quasi-Static Cyclic Tests on Emulative Precast Concrete Walls
Zhu Zhangfeng,Guo Zhengxing 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
This paper presents two types of emulative precast concrete walls with dry horizontal connection and semi-dry horizontalconnection. As for dry connection, vertical continuity reinforcing bars are grouted in metal bellows embedded in the precast wallpanel. As for semi-dry connection, the web reinforcing bars are still grouted in embedded metal bellows while the reinforcing barswithin boundary elements are overlapped and anchored in cast-in-place concrete. To assess the seismic performance of the twoconnections, three full-scale specimens, including one reference monolithic specimen and two precast specimens for eachconnection, were prefabricated and tested under in-plane quasi-static cyclic loading. The strength, stiffness, displacement ductility,and energy dissipation of the specimens were measured and compared. The experimental results demonstrated that, compared withthe monolithic specimen, both precast specimens exhibited satisfactory behavior and the semi-dry precast specimen performed betterthan the dry precast specimen in terms of ductility and energy dissipation. In addition, the analytical results showed that precastspecimens exhibited reliable seismic performance with high bearing capacity and large deformation capacity.
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