Effect of lateral confinement on short columns under uni-axial compression

Design interaction diagrams, Pr–Mr, for rectangular reinforced concrete sections under combined bending and axial compression or tension forces in accordance with the current Canadian code are presented. The interest of the note is that the interaction diagrams eliminate the limitations of those in the Canadian Portland Cement Association Handbook. Their format can be extended to other section shapes and reinforcement layouts. Key words: Combined bending, design aids, interaction diagrams, rectangular sections, reinforced concrete, short columns, strength analysis.

Download Full-text

A Method for Deformation Analysis of Bar-Reinforced Concrete Filled Steel Tubular Columns under Axial Compression

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.163-167.576 ◽

2010 ◽

Vol 163-167 ◽

pp. 576-581

Author(s):

Jin Sheng Han ◽

Shu Ping Cong

Keyword(s):

Reinforced Concrete ◽

Axial Compression ◽

Deformation Process ◽

Steel Tube ◽

Experimental Results ◽

Lateral Strain ◽

Deformation Analysis ◽

Simple Method ◽

Full Load ◽

Short Columns

Based on experimental researches, a simple numerical analysis method was presented to simulate the full load-deformation process of bar-reinforced concrete filled steel tubular short columns subjected to axial compression. Firstly, the interaction process of steel tube and concrete was analyzed, and then, the simplified constitutive models of steel tube and concrete were established on the base of previous analysis results. Secondly, the relation between lateral and longitudinal strain of steel tube was analyzed based on experimental results, and a simple method was presented to calculate the lateral strain of steel tube. Finally, a program was worked out to simulate the full load-deformation process of bar-reinforced concrete filled steel tubular short columns. The program’s simulation results of both ultimate bearing capacity and load-deformation curves are in good agreement with the experimental results.

Download Full-text

Study on the Mechanical Properties of BFRP Tube Confined Concrete Short Columns under Axial Compression

10.20944/preprints202009.0360.v1 ◽

2020 ◽

Author(s):

Xindong Ding ◽

Shuqing Wang ◽

Yu Liu ◽

Zepeng Zheng

Keyword(s):

Axial Compression ◽

Brittle Failure ◽

Failure Modes ◽

Concrete Strength ◽

Steel Tube ◽

Confined Concrete ◽

Test Results ◽

Compression Tests ◽

Short Columns ◽

Square Steel Tube

Axial compression tests were carried out on 6 square steel tube confined concrete short columns and 6 BFRP square pipe confined concrete axial compression tests. The concrete strength grades were C30, C40, and C50. The test results show that the failure modes of steel pipe and BFRP pipe are obviously different, and the BFRP pipe undergoes brittle failure. Compared with the short columns of concrete confined by BFRP pipes, the ultimate bearing capacity of axial compression is increased by -76.46%, -76.01%, and -73.06%, and the ultimate displacements are -79.20%, -80.78%, -71.71%.

Download Full-text