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| Study on shear hysteresis effect of steel truss web concrete composite girder bridge under prestressing action |
| Received:July 01, 2023 Revised:November 30, 2023 |
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| DOI：10.7511/jslx20230710001 |
| KeyWord:bridge engineering steel truss web concrete composite girder bridge prestressing equivalent load shear hysteresis effect energy variation method |
| Author | Institution |
| 刘小伟 |
兰州交通大学 土木工程学院, 兰州 ;四川交通职业技术学院 道路与桥梁工程系, 成都 |
| 杨霞林 |
兰州交通大学 土木工程学院, 兰州 |
| 王方旭 |
兰州交通大学 土木工程学院, 兰州 |
| 李胜 |
四川交通职业技术学院 道路与桥梁工程系, 成都 |
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| Abstract: |
| In order to analyze the effect of prestressing on the shear hysteresis effect of a concrete composite girder bridge with steel truss webs,based on the variational principle of energy,considering the shear deformation of steel truss webs and combining with the method of prestressing equivalent load,the analytical solution of the shear hysteresis effect of a steel truss web concrete composite girder bridge with a diagonal arrangement of webs in straight line,folded line and curved prestressing arrangement is established.Meanwhile,ANSYS finite element simulation is used to verify the correctness of the formulas in this paper and to analyze the shear hysteresis effect of the beams under different linear prestresses are arranged separately and in three types of prestressed integrated arrangements.The results show that the analytical solution of this paper matches well with the ANSYS finite element solution,and the absolute value of relative error is within 8.0%.The shear hysteresis effect of a steel truss web concrete composite girder bridge with diagonal arrangement of web rods under prestressing can be calculated effectively by using the formulas of this paper.The shear hysteresis coefficient of the eccentric linear cloth bundle in the mid-span position is 1,which does not produce shear hysteresis effect;the shear hysteresis effect in the mid-span position is more obvious in the case of folded wire bundle in the span and in-span curve bundles,with maximum shear hysteresis coefficients of 1.23 and 1.06,respectively;The shear hysteresis effect of the beam under the integrated prestressed bundles can be obtained by superposition of individual prestressed bundles,and thus the shear hysteresis coefficient of the mid-span section is up to 1.17,and thus the shear hysteresis effect caused by prestressing effect cannot be neglected. |
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