|Table of Contents|

Experiment on Axial Compression of Concrete Filled Steel Tube Composite Columns with Large Diameter Width Ratio(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2020年06期
Page:
21-28
Research Field:
Publishing date:

Info

Title:
Experiment on Axial Compression of Concrete Filled Steel Tube Composite Columns with Large Diameter Width Ratio
Author(s):
YAN Wei-ming1;  KONG Ling-xu1;  CI Jun-chang1;  ZHOU Da-xing2
1. Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit, Beijing University of Technology, Beijing 100124, China; 2. China Railway Construction Group Co., Ltd., Beijing 100040, China
Keywords:
concrete filled steel tube composite column;  axial compression performance;  size effect;  material strength;  reduction factor
PACS:
TU312
DOI:
-
Abstract:
In order to study the axial compression performance of concrete filled steel tube composite columns(CFSTCC)with larger aspect ratio,the axial compression test on six CFSTCCs with large diameter width ratio was completed.The diameter of the composite column was in the range of 400-600 mm and the steel pipe ratio of the composite column was in the range of 3.70%-6.75%. The strain of concrete inside the steel tube was measured with some acrylic rods, and the curves of typical strain growth in different parts of specimens with different diameters were given. Combined with the test results and size effects, the material strength reduction factor of concrete was introduced into the in composite columns, and the calculation formula of the ultimate bearing capacity for the CFSTCC with large diameter width ratio was proposed.The results show that the bearing capacity of CFSTCC with large diameter width ratio decreases slowly after reaching the peak load and has good ductility.The increasing of steel tube ratio directly enhances the bearing capacity of CFSTCC, and the bearing capacity of the specimen with 6.08% steel tube ratio is 27.3% higher than that of the specimen with 3.70% steel tube ratio. The specimens with different sizes have their own failure characteristics. Generally, the larger the size is, the more brittle the failure is, but the typical strain growth patterns of different size specimens are basically the same.The contribution of reinforced concrete outside the composite column to the bearing capacity is relatively small in the middle and later period of loading.

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