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| Deflection calculation of new corrugated steel web composite box girder considering shear deformation |
| Received:December 25, 2023 Revised:February 12, 2024 |
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| DOI：10.7511/jslx20231225003 |
| KeyWord:bridge engineering composite box girder with corrugate steel webs shear additional deflection virtual work principle shear form factor |
| Author | Institution |
| 蔡明昊 |
兰州交通大学 土木工程学院, 兰州 |
| 刘世忠 |
兰州交通大学 土木工程学院, 兰州 |
| 王志鲲 |
中铁二十一局集团电务电化工程有限公司, 兰州 |
| 张建功 |
中国十七冶集团有限公司北京工程设计分公司, 北京 |
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| Abstract: |
| In order to obtain a simple and efficient method for deflection calculation of a new type of corrugated steel web composite box girders at high accuracy,the effect of shear deformation of the whole cross-section is considered.Based on the analysis of the distribution characteristics of shear stress on the wall of the box girder,its deflection is divided into the Euler beam theoretical deflection and an additional deflection considering the shear deformation of the full section by using the principle of virtual work and the shear form factor considering the effect of full section.Based on the variational energy principle,the expression of the additional deflection of the full section is established.The scale model of the composite box girder with a new type of corrugated steel web was made,the concentrated load and uniform load tests were carried out,and the finite element model of the composite girder was established by ANSYSY finite element software for comparative analysis.The correctness of the theoretical formula is verified by the experimental results and the finite element calculation results.The parameter analysis shows that the shear deformation has a greater effect on the deflection of the composite box girder with corrugated steel web than that of the composite girder wing plate.The shear additional deflection of the wing plate decreases with the increase of the height-span ratio,but it is always smaller than that of the corrugated steel web plate.The additional shear deflection of corrugated steel web decreases with the decrease of width span ratio.When the width span ratio is less than 0.2,the influence of shear deformation of corrugated steel web can be ignored. |
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