Study of Post-Fire Axial Compressive Behavior of Self-Stress Ceramsite Concrete Filled Steel Tubular Short Columns

2013 ◽  
Vol 790 ◽  
pp. 185-188
Author(s):  
Jian Qi Lu ◽  
Hai Lun Tong ◽  
Jin Can Xu ◽  
Xin Tang Wang
Keyword(s):  
Longitudinal Strain ◽  
Circumferential Strain ◽  
Local Buckling ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Compressive Behavior ◽  
Steel Tubes ◽  
Aggregate Concrete ◽  
Short Columns ◽  
Concrete Filled Steel Tubes

The post-fire axial compressive behavior of a set of self-stress lightweight aggregate concrete filled steel tubes (noted as SSLC-ST) after exposure to fire was studied. Effect of the fire temperatures of the specimens and some parameters on the axial compressive behavior of the specimens was especially discussed. The results show that the initial circumferential strain of surface of the steel tubes is much larger than the longitudinal strain of the steel tubes, and the specimens of SSLC-ST have higher post-fire axial compression bearing capacity and better plastic deformation. It was concluded that the local buckling and overall failure of the specimens take place in succession while the specimens are axially loaded, and there are a lot of slip lines with angle of 45oon surface of the steel tubes.

Experimental Study of Performance of Self-Stress Lightweight Aggregate Concrete Filled Steel Tubes after Exposure to Fire

2013 ◽  
Vol 790 ◽  
pp. 173-176
Author(s):  
Jin Can Xu ◽  
Peng Fei Ren ◽  
Hai Lun Tong ◽  
Xin Tang Wang
Keyword(s):  
Bearing Capacity ◽  
Fire Behavior ◽  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Fire Load ◽  
Steel Tubes ◽  
Aggregate Concrete ◽  
Expansive Agent ◽  
Short Columns ◽  
Concrete Filled Steel Tubes

The post-fire behavior of a set of self-stress lightweight aggregate concrete filled steel tubular short columns (noted as SSLC-SSC) after exposure to fire was experimentally studied. Effect of the maximum value of fire response temperatures of the tubes and their geometric parameters on the strength and the other mechanical property of the specimens were especially discussed. The experimental results show that the specimens of SSLC-SSC have higher post-fire bearing capacity and better plastic deformation, there was no obvious descent segment in post-fire load-displacement curves of the most specimens subjected to fire load. It was concluded that the maximum response temperature of specimens has great effect on the post-fire bearing capacity of self-stress concrete-filled steel tubes subjected to fire load, and the value of self-stress corresponding to 10% of dosage of expansive agent has the greatest effect on post-fire bearing capacity of specimens of SSLC-SSC.

Pure Bending behavior of Lightweight Aggregate Concrete Filled Circular Steel Tubes

2011 ◽  
Vol 374-377 ◽  
pp. 2239-2244
Author(s):  
Fa Xing Ding ◽  
Ya Ting Luo ◽  
Xiao Yong Ying ◽  
Zhao Hui Lu
Keyword(s):  
Lightweight Aggregate ◽  
Fortran Program ◽  
Lightweight Aggregate Concrete ◽  
Pure Bending ◽  
Steel Tubes ◽  
Aggregate Concrete ◽  
Composite Section ◽  
The Moment ◽  
Relationship Of ◽  
Concrete Filled Steel Tubes

Based on appropriate numerical constitutive model of lightweight aggregate concrete filled steel tubes (LCFST), layered method was adopted to predict the complete moment-curvature curves of LCFST composite section subjected to pure bending. A FORTRAN program for the moment-curvature curves was developed. Applying the layered method, the influences of the significant parameters, such as steel ratio, yield strength of steel and strength of lightweight aggregate concrete on the moment-curvature curves of the composite section subjected to pure bending were discussed. The practical composite flexural stiffness, ultimate moment and practical moment- curvature relationship of LCFST composite section were presented. The predicted results of both layered method and practical moment-curvature relationships of LCFST composite section are in good agreement with the test results from reference. Compared with the layered method, practical calculate method could remove the step of composite section layered and improve the calculation speed while achieving similar results.

The axial compressive behavior of stone-lightweight aggregate concrete-filled steel tubular stub columns

2021 ◽  
Vol 298 ◽  
pp. 123815
Author(s):  
Xianggang Zhang ◽  
Songpeng Zhang ◽  
Yuhui Fan ◽  
Yahong Ding ◽  
Xingguo Wang ◽  
...  
Keyword(s):  
Lightweight Aggregate ◽  
Lightweight Aggregate Concrete ◽  
Compressive Behavior ◽  
Aggregate Concrete ◽  
Stub Columns

scholarly journals Influence of Red Mud Proportion on Circular Concrete-Filled Steel Tubular Short Columns

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Wu Bin ◽  
Tan Zhuoying ◽  
Li Fan ◽  
Wang Sun
Keyword(s):  
Red Mud ◽  
Longitudinal Strain ◽  
Ultimate Load ◽  
Steel Tube ◽  
Steel Tubes ◽  
Concrete Filled Steel Tube ◽  
Short Columns ◽  
Calculation Results ◽  
Concrete Filled Steel Tubes ◽  
Stub Columns

Tests on twelve circular concrete-filled steel tube stub columns with mixed red mud and three circular concrete-filled steel tube stub columns to investigate the influence of the mixed proportion of red mud on the mechanical behavior of axial compressive circular concrete-filled steel tube stub columns are reported. It is found that with the increase of red mud content, the ultimate load increases first and then decreases; on the contrary, the ultimate displacement decreases first and then increases; the specimen stress reaches the proportion limitation as the steel tube longitudinal strain is around 160 με and reaches the yield limitation as the steel tubes’ longitudinal strain is around 4400∼5000 με. The axial compressive bearing capacity empirical formulation of concrete-filled steel tubes stub columns mixed with red mud is proposed. The theoretical calculation results agree well with those experimental data.

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