Seismic Performance of Hybrid Columns of Concrete-Filled Square Steel Tube with FRP-Confined Concrete Core

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%.

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Analysis on Bearing Capacity of Solid Multibarrel Tube-Confined Concrete Short Columns (CHS Inner and SHS Outer) under Axial Compressive Load

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.255-260.151 ◽

2011 ◽

Vol 255-260 ◽

pp. 151-156 ◽

Cited By ~ 1

Author(s):

Zhao Qiang Zhang ◽

Yong Yao

Keyword(s):

Ultimate Load ◽

Concrete Strength ◽

Compressive Load ◽

Steel Tube ◽

Confined Concrete ◽

Unified Strength Theory ◽

Short Columns ◽

Circular Steel Tube ◽

Reduction Coefficient ◽

Square Steel Tube

By introducing the reduction coefficient of concrete strength and the equivalent restriction reduction coefficient,the non-uniform confinement force of square steel tube to its core concrete is turned to that of equivalent circular steel tube. Then the ultimate load calculation formula for the solid multibarrel tube-confined concrete short columns (CHS inner and SHS outer) is derived based on the Unified Strength Theory(UST),in which the double restriction effect and the decrease of longitudinal stress because of the hoop tensile tension are considered. The influence of intermediate principal stress on the ultimate load is studied and the failure mechanism is discussed. The applicability of the formulas is testified and the results show that the formulas have significance in exerting material potential.

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Comparative Study on the Design Schemes of Residential Steel Structure

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.238.581 ◽

2012 ◽

Vol 238 ◽

pp. 581-584

Author(s):

Yong Chun Xu ◽

Zhong Ping Tang

Keyword(s):

Comparative Study ◽

Seismic Performance ◽

Residential Building ◽

Steel Structure ◽

Steel Tube ◽

Tube System ◽

Interior Decoration ◽

Steel Consumption ◽

Square Steel Tube ◽

Model Graph

This paper choses a duplex apartment which is six floors steel structure as the research object, on the ground of the same building size, with the same beam & tie rod, and the same material for the floor ground & wall plate, two structure system schemes are designed respectively using the H sections and square steel tube as the form of pillar section. The calculate model are made respectively applying the FEA software. From the model graph, natural frequency, economic and technology and other index, the following conclusions are given out comparing the two schemes: the multi floor residential building of light steel structure with square steel tube and H sections is feasible in seismic performance, the steel consumption of the square steel tube system is lower than the H sections system. The square steel tube system is superior to the H sections system in interior decoration and utilizing construction area.

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

10.20944/preprints202009.0189.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%.

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