Cyclic loading tests and shear strength of composite joints with steel-reinforced recycled concrete columns and steel beams

2019 ◽  
Vol 199 ◽  
pp. 109605 ◽  
Author(s):  
Hui Ma ◽  
Jing Dong ◽  
Yunhe Liu ◽  
Dixiong Yang
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Concrete Columns ◽  
Recycled Concrete ◽  
Steel Beams ◽  
Composite Joints ◽  
Loading Tests ◽  
Cyclic Loading Tests

Cyclic loading tests and shear strength of steel reinforced recycled concrete short columns

2015 ◽  
Vol 92 ◽  
pp. 55-68 ◽  
Author(s):  
Hui Ma ◽  
Jianyang Xue ◽  
Yunhe Liu ◽  
Xicheng Zhang
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Recycled Concrete ◽  
Short Columns ◽  
Loading Tests ◽  
Cyclic Loading Tests

Cyclic loading tests and shear strength of steel reinforced recycled concrete beam-column inner joints

2017 ◽  
Vol 27 (6) ◽  
pp. e1454 ◽  
Author(s):  
Jianyang Xue ◽  
Lei Zhai ◽  
Yuze Bao ◽  
Rui Ren ◽  
Xicheng Zhang
Keyword(s):  
Shear Strength ◽  
Cyclic Loading ◽  
Concrete Beam ◽  
Recycled Concrete ◽  
Loading Tests ◽  
Cyclic Loading Tests

SEISMIC ENHANCEMENT OF REINFORCED-CONCRETE COLUMNS BY REBAR-RESTRAINING COLLARS

2012 ◽  
Vol 06 (03) ◽  
pp. 1250015 ◽  
Author(s):  
ANAT RUANGRASSAMEE ◽  
ARCHAWIN SAWAROJ
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Columns ◽  
Bridge Columns ◽  
Concrete Bridge ◽  
Reinforcing Bars ◽  
Plastic Hinges ◽  
Reinforced Concrete Bridge ◽  
Loading Tests ◽  
Cyclic Loading Tests

When reinforced-concrete columns are subjected to lateral cyclic loading, columns usually suffer failures at plastic hinges. If the buckling of longitudinal reinforcements at plastic hinges can be prevented or delayed, columns are expected to carry gravity loads at a higher ductility level. In this study, the rebar-restraining collar (RRC) was developed to improve the post-buckling behavior of longitudinal reinforcements. The behavior was investigated under monotonic loading tests of reinforcing bars with the RRCs and the cyclic loading tests of two reinforced-concrete bridge columns with and without RRCs. From the monotonic loading test, it was found that the RRCs significantly improved the post-yielding behavior of longitudinal reinforcing bars. The ductility and energy dissipation of longitudinal reinforcing bars with RRCs was significantly higher than that of the bare bar. Then, cyclic loading tests of two reinforced-concrete bridge columns were conducted. The cross section of columns was 0.4 m × 0.4 m, and the effective height was 2.15 m. The ratio of longitudinal reinforcing bars was 0.0123, and the volumetric ratio of transverse reinforcement was 0.00424. The column with RRCs did not have buckling of longitudinal reinforcements and had the ductility enhancement of about 17%, comparing to the column without RRCs. One evident benefit of using the RRCs is to control damage at plastic hinges of columns. Hence, the repair cost of columns after an earthquake can be reduced.

scholarly journals Low reversed cyclic loading tests for integrated precast structure of lightweight wall with single-row reinforcement under a lightweight steel frame

2018 ◽  
Vol 5 (10) ◽  
pp. 180321 ◽  
Author(s):  
Jia Suizi ◽  
Cao Wanlin ◽  
Zhang Yuchen
Keyword(s):  
Cyclic Loading ◽  
Steel Frame ◽  
Recycled Concrete ◽  
Single Row ◽  
Reversed Cyclic Loading ◽  
Lightweight Steel ◽  
Loading Tests ◽  
Precast Structures ◽  
Cyclic Loading Tests ◽  
Reversed Cyclic

Given the development of precast structures for low-rise residential buildings, this study explores a new structure—namely, an integrated precast structure of lightweight recycled concrete wall with single-row reinforcement—under a lightweight steel frame filled with recycled concrete (integrated precast structure for short). The lightweight steel frame and lightweight wall cooperate to bear the forces. The applied concealed bracing, either a rebar bracing or a steel plate bracing, increases the shear resistance of the wall. The lightweight steel frame is designed to bear the vertical loading, whereas the seismic load in the horizontal direction is jointly borne by the frame and wall. This study presents the results of low reversed cyclic loading tests on nine specimens of integrated precast structures. An analysis is then carried out to investigate the mechanical properties of the specimens; based on these results, a formula for the force-bearing performance of the inclined section is developed. The results show satisfactory performance as an integrated piece; the proposed structure has two seismic lines of defence, with the lightweight wall restraint by the side frame being the first line and the steel frame being the second line. Because the failure of the wall can be categorized as shear failure, the restraint of the lightweight steel frame significantly reduces the potential damage of the wall. As the beams and columns of the steel frame tend to bend against failure, the wall filling helps resist sliding. Therefore, the reinforced joints of the connecting beams and columns show no visible signs of damage, indicating that the connection between the beams and columns is reliable. The narrow spacing of rebars and the setting of concealed bracing contribute to the increase in ductility and energy efficiency of the integrated structure and the evident reduction in the failure process. Furthermore, the recycled concrete increases the seismic resistance of the structure.

Deformation and Acoustics Parameters Feature of Recycled Concrete under Cyclic Loading

2011 ◽  
Vol 80-81 ◽  
pp. 213-216 ◽  
Author(s):  
Xing Wen Luo ◽  
Hai Lin Yao
Keyword(s):  
Cyclic Loading ◽  
Linear Equations ◽  
Recycled Concrete ◽  
Demolition Waste ◽  
Cycle Times ◽  
Concrete Production ◽  
Loading Tests ◽  
Three Stages ◽  
Cyclic Loading Tests ◽  
Excellent Source

Concrete demolition waste has been proved to be an excellent source of aggregates for new concrete production. Four types of recycled concrete specimens were made for cyclic loading tests in laboratory, in order to research the acoustics parameters and deformation feature of recycled concrete under cyclic loading. Acoustics parameters such as ultrasonic wave time, ultrasonic velocity and ultrasonic amplitude of recycled concrete were tested synchronously while recycled concrete were loaded. Test results show the evolution of fatigue total strain of recycled concrete undergoes three stages. The cycle times in the three stages accounted for 10%, 80% and 10% of the fatigue life respectively. These stages can be simulated by power function equations, first-order linear equations and exponential functions accordingly. Tests results show that wave time increased with the rise of cyclic times, while wave amplitude decreased in the same time.

scholarly journals Experimental Study on Shear Capacity of Waste Fiber Recycled Concrete Shear Wall

2020 ◽  
Vol 198 ◽  
pp. 01037
Author(s):  
Xiaohu Li ◽  
Lei Li
Keyword(s):  
Cyclic Loading ◽  
Volume Ratio ◽  
Shear Wall ◽  
Shear Capacity ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Plane Shear ◽  
Shear Bearing Capacity ◽  
Loading Tests ◽  
Cyclic Loading Tests

In this paper, the shear capacity of waste fiber recycled concrete shear wall (FCSW) is studied by cyclic loading tests on 9 specimens. The failure of the specimens under low cycle cyclic loading is analyzed. The influence of waste fiber content, recycled aggregate content and axial compression ratio on the shear capacity of shear wall is studied. The results show that: the larger the volume ratio of waste fiber is, the higher the shear bearing capacity of shear wall is; the addition of recycled coarse aggregate will reduce the shear capacity of shear wall; the shear capacity of shear wall increases with the increase of axial pressure. On the basis of relevant specifications, the calculation formula of in-plane shear capacity of waste fiber recycled concrete shear wall is proposed considering the influence of waste fiber on shear capacity. By comparing with the test results, it can be found that the two formulas are in good agreement. The conclusion of the study can provide reference for the design of waste fiber recycled concrete shear wall.

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