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Mechanical properties of truss concrete composite beam preslressed encased with circular steel tubes

Zhang Bo-yi1;Zheng Wen-zhong1;Yuan Zhong-guo2
  

  1. 1.School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China；2.Department of Materials Engineering,Jilin Technology College of Electronic Information, Jilin 132021,China
  • Received:2007-04-25 Revised:2007-06-25 Online:2008-05-01 Published:2008-05-01

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Abstract: A truss concrete composite freesupported beam prestressed encased with 4 circular steel tubes was tested and its curve of loaddeflection at mid span, the bending loading capacity, the distribution and development of the cracks were obtained. The results showed that the pure bending region of the beam accords with the plane section assumption from loading to failure, and the average crack spacing depends on the external diameter of the bottom chord tube and the ratio of the sum of the section areas of the two bottom chord tubes to the effective tensile concrete area. The formulas for the bending loading capacity, the stiffness, and the crack width which are in good agreement with the test results of the beam were presented.

Key words: engineering mechanics, truss concrete composite beam prestressed encased with circular steel tubes, bending loading capacity, stiffness, crack width, prestress

CLC Number: 

  • TU378.1
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