Mechanical behavior of a replaceable energy dissipation device for precast concrete beam-column connections

2020 ◽  
Vol 164 ◽  
pp. 105816 ◽  
Author(s):  
Gaoxing Hu ◽  
Wei Huang ◽  
Haiqiao Xie
Keyword(s):  
Energy Dissipation ◽  
Mechanical Behavior ◽  
Concrete Beam ◽  
Precast Concrete

Comparing the Seismic Performance of Beam-Column Joints with and without SFRC when Subjected to Cyclic Loading

2012 ◽  
Vol 626 ◽  
pp. 85-89 ◽  
Author(s):  
Kay Dora Abdul Ghani ◽  
Nor Hayati Hamid
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Seismic Performance ◽  
Experimental Work ◽  
Concrete Beam ◽  
Steel Fiber ◽  
Precast Concrete ◽  
Experimental Results ◽  
Column Joint ◽  
Initial Cracks

The experimental work on two full-scale precast concrete beam-column corner joints with corbels was carried out and their seismic performance was examined. The first specimen was constructed without steel fiber, while second specimen was constructed by mixed up steel fiber with concrete and placed it at the corbels area. The specimen were tested under reversible lateral cyclic loading up to ±1.5% drift. The experimental results showed that for the first specimen, the cracks start to occur at +0.5% drifts with spalling of concrete and major cracks were observed at corbel while for the second specimen, the initial cracks were observed at +0.75% with no damage at corbel. In this study, it can be concluded that precast beam-column joint without steel fiber has better ductility and stiffness than precast beam-column joint with steel fiber. However, precast beam-column joint with steel fiber has better energy dissipation and fewer cracks at corbel as compared to precast beam-column joint without steel fiber.

scholarly journals A Novel Precast Concrete Beam–Column Connection With Replaceable Energy-Dissipation Connector: Experimental Investigation and Theoretical Analysis

2021 ◽  
Author(s):  
Chao Tong ◽  
Jing Wu ◽  
Chunyu Li
Keyword(s):  
Energy Dissipation ◽  
Concrete Beam ◽  
Load Capacity ◽  
Precast Concrete ◽  
Total Yield ◽  
Bending Moment ◽  
Structural Features ◽  
Precast Column ◽  
Vertical Slot ◽  
Cracking Pattern

Abstract In order to avoid the damage of the connection due to the overstrength of beam strength, and the alternation of the strength hierarchy in the structural system. The additional bending moment produced by the combined action of the pressure generated by the concrete compression zone and the tension generated by the reinforcements needs to be reduced. A novel precast concrete beam–column connection is proposed herein. In the proposed connection, the precast beam is laid on a steel corbel embedded in the precast column. A novel replaceable energy-dissipation connector (REDC) is placed at the bottom of the steel corbel, which ensures that it is in the same horizontal position aligned with the longitudinal reinforcement at the bottom of the connection. In addition, there is a narrow vertical slot adjacent to the column face. The total yield capacity of the top reinforcement is larger than that of the bottom REDC energy-dissipation connector. Theory study focused on the structural features and mechanical mechanism of this novel precast connection. Three low-cycle quasi-static loading tests were carried out on a single full-scaled specimen by replacing three REDCs with different sizes. The cracking pattern of this novel precast connection, and the effects of different parameters of the REDCs on the energy-dissipation capacity and load capacity of the connections were discussed. By performing a finite-element simulation, a method for reducing the additional bending moment and keeping the top reinforcements always in elastic was developed. In addition, the relevant design suggestions were provided. The conclusion shows that the seismic performance of this novel precast concrete beam–column connection is excellent. The positive and negative bending moments of novel precast concrete beam–column connection both reduce the additional bending moment. In view of this, the bending moment of the novel connection is a controllable variable.

scholarly journals Experimental Study of a New Precast Prestressed Concrete Joint

2018 ◽  
Vol 8 (10) ◽  
pp. 1871 ◽  
Author(s):  
Xueyuan Yan ◽  
Suguo Wang ◽  
Canling Huang ◽  
Ai Qi ◽  
Chao Hong
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Prestressed Concrete ◽  
Precast Concrete ◽  
Concrete Strength ◽  
Frame Structure ◽  
Loading Test ◽  
Concrete Frame ◽  
Concrete Joints ◽  
Precast Prestressed Concrete

Precast monolithic structures are increasingly applied in construction. Such a structure has a performance somewhere between that of a pure precast structure and that of a cast-in-place structure. A precast concrete frame structure is one of the most common prefabricated structural systems. The post-pouring joint is important for controlling the seismic performance of the entire precast monolithic frame structure. This paper investigated the joints of a precast prestressed concrete frame structure. A reversed cyclic loading test was carried out on two precast prestressed concrete beam–column joints that were fabricated with two different concrete strengths in the keyway area. This testing was also performed on a cast-in-place reinforced concrete joint for comparison. The phenomena such as joint crack development, yielding, and ultimate damage were observed, and the seismic performance of the proposed precast prestressed concrete joint was determined. The results showed that the precast prestressed concrete joint and the cast-in-place joint had a similar failure mode. The stiffness, bearing capacity, ductility, and energy dissipation were comparable. The hysteresis curves were full and showed that the joints had good energy dissipation. The presence of prestressing tendons limited the development of cracks in the precast beams. The concrete strength of the keyway area had little effect on the seismic performance of the precast prestressed concrete joints. The precast prestressed concrete joints had a seismic performance that was comparable to the equivalent monolithic system.

Experimental Evaluation of Precast Concrete Beam-Column Connections with High-strength Steel Rebars

2018 ◽  
Vol 23 (1) ◽  
pp. 238-250 ◽  
Author(s):  
Dongzhi Guan ◽  
Zhengxing Guo ◽  
Cheng Jiang ◽  
Sen Yang ◽  
Hui Yang
Keyword(s):  
Experimental Evaluation ◽  
High Strength Steel ◽  
Concrete Beam ◽  
Precast Concrete ◽  
High Strength ◽  
Steel Rebars

An innovative detail for precast concrete beam–column moment connections

1991 ◽  
Vol 18 (4) ◽  
pp. 690-710
Author(s):  
Hany Ahmed El-Ghazaly ◽  
Heyad Saud Al-Zamel
Keyword(s):  
Concrete Beam ◽  
Experimental Testing ◽  
Precast Concrete ◽  
Steel Frame ◽  
Reinforcing Bars ◽  
Shear Tests ◽  
Moment Connections ◽  
Modes Of Failure ◽  
Moment Resisting ◽  
Flexural Tests

A new detail is introduced for precast concrete beam-to-column moment connections. The detail consists of a connecting steel frame used to mechanically connect the threaded end protruding reinforcing bars from beam and column. The connection detail is made convenient to assemble where the erection method resembles that of steel construction. No idle crane time is necessary, since the connecting steel frame is designed to carry the beam's own weight. When the connection construction is completed, the joint functions as a moment resisting hard connection. The experimental testing program involved testing of twelve full-scale specimens in addition to a pilot test. Of the twelve tests seven are flexural tests, three are shear tests, and two are monolithic flexural tests for comparison. Modes of failure in the flexural tests were mainly due to rupture of tension reinforcement; however, premature slippage of the rebars may occur under certain conditions, but could be conveniently prevented. In the shear tests, diagonal tension crack failure predominated. If the connection parameters are properly selected, the connection will be capable of developing the beam's full plastic moment and undergo sufficient rotation before collapse. Key words: precast concrete, moment connections, connecting steel frame, stiffness, strength, ductility.

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