Evaluation of structural performance for beam-column joints with high-strength materials under cyclic loading using PIV technique

Structures located in seismic zones require significant ductility. It is necessary to examine the bond slip characteristics of high strength concrete under cyclic loading. The cyclic bond of high strength concrete is investigated under different parameters, including load history, confining reinforcement, bar diameter, concrete strength, and the rate of pull out. The bond strength, cracking, and deformation are highly dependent on the bond slip behavior between the rebar and the concrete under cyclic loading. The results of cyclic testing indicate that an increase in cyclic displacement will lead to more severe bond damage. The slope of the bond stress displacement curve can describe the influence of the rate of loading on the bond strength in a cyclic test. Specimens with steel confinement sustained a greater number of cycles than the specimens without steel confinement. It has been found that the maximum bond strength increases with an increase in concrete strength. Cyclic loading does not affect the bond strength of high strength concrete as long as the cyclic slip is less than the maximum slip for monotonic loading. The behavior of high strength concrete under a cyclic load is slightly different from that of normal strength concrete.Key words: bond, high strength, cyclic loading, bar spacing, loading rate, failure mechanism.

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Structural Performance of GFRP Deck Strengthened with Light Weight Ultra-High Strength Concrete

Lecture Notes in Civil Engineering - Proceedings of SECON 2020 ◽

10.1007/978-3-030-55115-5_7 ◽

2020 ◽

pp. 69-78

Author(s):

K. Teena John ◽

P. E. Kavitha ◽

R. Renjith

Keyword(s):

High Strength Concrete ◽

High Strength ◽

Structural Performance ◽

Light Weight ◽

Strength Concrete

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Cyclical Behavior of Concrete-Encased Composite Frame Joints with High Strength Concrete

Advances in Materials Science and Engineering ◽

10.1155/2015/873162 ◽

2015 ◽

Vol 2015 ◽

pp. 1-13 ◽

Cited By ~ 5

Author(s):

Lei Zeng ◽

Zhenkun Cui ◽

Yunfeng Xiao ◽

Siqian Jin ◽

Yuanyuan Wu

Keyword(s):

Cyclic Loading ◽

High Strength Concrete ◽

Joint Strength ◽

Concrete Strength ◽

Outer Part ◽

High Strength ◽

Crack Pattern ◽

Experimental Program ◽

Strength Concrete ◽

Composite Frame

This paper presents an application of high strength concrete to concrete-encased composite frame building based on an experimental program. The work emphasized joints behavior under reverse cyclic loading caused by earthquakes to provide information for seismic design. To investigate the internal mechanisms and seismic performance, cyclic loading tests were carried out on five half-scale interior joints. Two design variables were addressed in the research: concrete strength and axial column load. Frame joints performance including crack pattern, failure mode, deformation, ductility, strain distribution, and energy dissipation capacity was investigated. It was found that all joint specimens behaved in a manner with joint panel shear failure. Using high strength concrete increased the joint strength and had relatively little effect on the stiffness and ductility. The axial column load helped the joint strength by better mobilizing the outer part of the joint, but it had an obvious influence on the ductility and energy-dissipating capacity, which can be improved by providing enough transverse reinforcement. A typical crack pattern was also provided which can well reflect mechanical character and damage process. This research should contribute to the future engineering applications of high strength concrete to concrete-encased composite structure.

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