Effects of Steel Lap Splice Locations on Strength and Ductility of Reinforced Concrete Columns

2010 ◽  
Vol 13 (1) ◽  
pp. 199-214 ◽  
Author(s):  
H.J. Pam ◽  
J.C.M. Ho
Keyword(s):  
Reinforced Concrete ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
Lap Splice ◽  
Strength And Ductility

Retrofit of Concrete Columns with Inadequate Lap Splices by the Use of Rectangular Steel Jackets

1996 ◽  
Vol 12 (4) ◽  
pp. 693-714 ◽  
Author(s):  
Riyad S. Aboutaha ◽  
Michael D. Engelhardt ◽  
James O. Jirsa ◽  
Michael E. Kreger
Keyword(s):  
Reinforced Concrete ◽  
Large Scale ◽  
Concrete Columns ◽  
Seismic Retrofit ◽  
Design Guidelines ◽  
Reinforced Concrete Frame ◽  
Reinforced Concrete Columns ◽  
Lap Splice ◽  
Concrete Frame ◽  
Anchor Bolts

This paper describes an experimental research program on the use of rectangular steel jackets for seismic retrofit of non-ductile reinforced concrete frame columns. Eleven large scale columns were tested to examine the effectiveness of various types of steel jackets for improving the ductility and strength of columns with an inadequate lap splice in the longitudinal reinforcement. Response of the columns before and after being strengthened with steel jackets was examined. Several types of steel jackets were investigated, including rectangular solid steel jackets with and without adhesive anchor bolts. The test results indicate that a thin rectangular steel jacket combined with adhesive anchor bolts can be a highly effective retrofit measure for reinforced concrete columns with an inadequate lap splice. Design guidelines for the use of rectangular steel jackets as a seismic retrofit for non-ductile reinforced concrete columns are presented.

The Simulation Analysis of the Bearing Capacity of the BFRP Reinforced Concrete Columns

2014 ◽  
Vol 584-586 ◽  
pp. 1046-1049
Author(s):  
Ke Li ◽  
Ru Heng Wang ◽  
Jun Mo ◽  
Bin Jia
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Simulation Analysis ◽  
Basalt Fiber ◽  
Concrete Columns ◽  
The Finite Element Method ◽  
Reinforced Concrete Column ◽  
Reinforced Concrete Columns ◽  
Reinforced Plastic ◽  
Strength And Ductility

The behavior of the bearing capacity of the reinforced concrete columns confined with basalt fiber reinforced plastic sheet (BFRP) under axial compression is analyzed by the finite element method, and obtain the ultimate compressive strength and stress distribution of the BFRP. The analysis results show that the simulation results agree well with the experimental results, the strength and ductility of the BFRP reinforced concrete columns are improved obviously. The ratio of the strength test values and simulation values is between 0.91~1.14, the error is within an acceptable range. Then based on the strength of FRP confined concrete columns model, the test values are compared with those of the strength model calculation values, the ratio of the simulation values and calculated values is ​​between 0.94 to 1.03,that means the simulation values are credible. The mechanical properties of the BFRP reinforced concrete column are improved significantly.

On lap splice length of lap-spliced crossties for reinforced concrete columns under cyclic loading

2020 ◽  
Vol 23 (12) ◽  
pp. 2669-2678
Author(s):  
Tai-Kuang Lee ◽  
Cheng-Cheng Chen
Keyword(s):  
Reinforced Concrete ◽  
Cyclic Loading ◽  
Concrete Columns ◽  
Seismic Resistance ◽  
Reinforced Concrete Column ◽  
Reinforced Concrete Columns ◽  
Lap Splice ◽  
Concrete Confinement ◽  
Confining Effect

A lap-spliced crosstie comprises two J-shaped rebars, each with a 180° hook at one end and straight at the other end. Six large reinforced concrete columns subjected to lateral cyclic loading were tested. The results indicated the following: (1) the confining effect of horizontally lap-spliced crossties is similar to that of vertically lap-spliced crossties. (2) Splice length of the lap-spliced crossties that is smaller than the code requirement can also provide sufficient concrete confinement. (3) A method for determining required lap splice length for lap-spliced crossties is proposed. (4) The lap-spliced crosstie can considerably improve the constructability of the crossties. Furthermore, the construction quality of reinforced concrete column reinforcement and the seismic resistance capability of reinforced concrete structures can be significantly upgraded.

Stirrup effects on compressive strength and ductility of confined concrete columns

2013 ◽  
Vol 10 (6) ◽  
pp. 497-506 ◽  
Author(s):  
Jure Radnic ◽  
Radoslav Markic ◽  
Alen Harapin ◽  
Domagoj Matesan ◽  
Goran Baloevic
Keyword(s):  
Compressive Strength ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Experimental Testing ◽  
Rectangular Cross Section ◽  
Concrete Columns ◽  
Confined Concrete ◽  
Reinforced Concrete Columns ◽  
Strength And Ductility

The results of experimental testing of stirrup effects on compressive strength and ductility of axially loaded confined reinforced concrete columns of rectangular cross-section are presented. Effects of different concrete strengths, different stirrup bar diameters and different stirrup spacing on column's bearing capacity and ductility have been researched.

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