Tensile Lap Splices in Reinforced Concrete Beams Under Inelastic Cyclic Loading

10.14359/2971 ◽  
1988 ◽  
Vol 85 (1) ◽  
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Lap Splices

The effect of confinement on lap splices in reversed cyclic loading

1986 ◽  
Vol 13 (6) ◽  
pp. 681-692 ◽  
Author(s):  
B. Sparling ◽  
T. Rezansoff
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Large Scale ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Damping Capacity ◽  
Reversed Cyclic Loading ◽  
Lap Splices ◽  
Large Scale Tests ◽  
Reversed Cyclic

Twelve large-scale tests (7 m beams with 30 mm main reinforcement) were made to investigate the performance of lap splices in reinforced concrete beams subjected to reversed cyclic loading which produced yielding in the main reinforcement. Load history and various configurations of splice confinement were the major parameters considered. Performance was judged on the basis of strength, ductility, and several degradation indicators.Behavior was dependent on the degree of splice confinement. Specimens containing superior splice confinement, provided either by closely spaced stirrups or by closely fitting spirals, were more ductile and sustained more load cycles, on average, prior to failure. It was advantageous to provide more splice confinement than the amount considered to be effective under static loading. Tensile splices designed with superior confinement according to proposed seismic specifications achieved ductility ratios (failure deflection divided by first yield deflection with no splice) which averaged 2.66.Reversed cyclic loading was more damaging than repeated unidirectional or monotonic loading. The number of reversed load cycles to failure decreased as the intensity of loading increased. Under load reversals, the reduction in stiffness, the increase in energy dissipation, and the gain in damping capacity were used to examine the degradation that could be sustained before failure. Key words: reinforced concrete, beams, bond, splices, cyclic loads, ductility, seismic design, joints, deflection, strength, stiffness, damping.

scholarly journals Local Behavior of Lap-Spliced Deformed Rebars in Reinforced Concrete Beams

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7186
Author(s):  
Agha Syed Muhammad Gillani ◽  
Seung-Geon Lee ◽  
Soo-Hyung Lee ◽  
Hyerin Lee ◽  
Kee-Jeung Hong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
American Concrete Institute ◽  
Reinforced Concrete Beams ◽  
Local Behavior ◽  
Test Results ◽  
Loading Test ◽  
Lap Splices ◽  
Lap Splice ◽  
Ductile Behavior

Twelve full-scale reinforced concrete beams with two tension lap splices were constructed and tested under a four-point loading test. Half of these beams had shorter lap splices than that recommended by American Concrete Institute Building Code ACI 318-19; they failed by bond loss between steel and concrete at the lap splice region before rebar yielding. The other half of the beams were designed with a lap splice length slightly exceeding that recommended by ACI 318-19; they failed by rebar yielding and exhibited a ductile behavior. Several strain gauges were attached to the longitudinal bars in the lap splice region to study the local behavior of deformed bars during loading. The strain in a rebar was maximum at the loaded end of the lap splice and progressively decreased toward the unloaded end because the rebar at this end could not sustain any load. Stress flow discontinuity occurred at the loaded end and caused stress concentration. The effect of this concentration was investigated based on test results. The comparison of bond strengths calculated by existing equations and those of tested specimens indicated that the results agreed well.

Experimental Study on Flexural Behavior of Reinforced Concrete Beams with Variety Lap Splices of Reinforcing Steel Bars

2016 ◽  
Vol 845 ◽  
pp. 132-139
Author(s):  
Mochamad Teguh ◽  
Novia Mahlisani
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Reinforced Concrete Structures ◽  
Reinforcing Steel ◽  
Reinforcing Bars ◽  
Lap Splices ◽  
Steel Bars

The limited lengths of reinforcing bars have been commonly found in the practical construction of most reinforced concrete structures. The required length of a bar may be longer than the available stock of steel length. For maintaining desired continuity of the reinforcement in almost all reinforced concrete structures, some reinforcing bars should be carefully spliced. In the case of long flexural beam, bar installers end up with two or even more pieces of steel that must be spliced together to accomplish the desired steel length. An experimental study was conducted to investigate flexural behavior of reinforced concrete beams utilizing a variety lap splices of reinforcing steel bars under two-point loading. Five variations of lap splices of reinforcing steel bars positioned at midspan of tensile reinforcement of the beam were investigated. Welded joints and overlapped splices were used to construct the variation of lap splices of reinforcing steel bars. The general trend in crack pattern, the load deflection characteristics and the mode of failure of flexural beams under two-point loading were also observed. The flexural strength comprising load-displacement response, flexural crack propagation, displacement ductility is briefly discussed in this paper.

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