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| Calculation of initial translational stiffness of PBL node and optimization of design parameters |
| Received:January 16, 2021 Revised:April 28, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20210116001 |
| KeyWord:PBL node translational stiffness component method orthogonal analysis parameter optimization |
| Author | Institution |
| 王方旭 |
兰州交通大学 土木工程学院, 兰州 |
| 杨霞林 |
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 |
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| Abstract: |
| In order to study the initial translational stiffness and its influencing factors of the PBL (Perfobond Leiste) node in the steel-truss-web-concrete composite box girder,firstly,based on the component method,the second theorem of Karnife was used to derive that the interface shear force between the steel plate and the concrete.The initial translational stiffness expression of the PBL node contributed by falcon,followed by an engineering example as a background,combined with the finite element model to verify the rationality of the formula;on this basis,effects of the concrete strength,web member diameter,and web member wall thickness are analyzed.The influence of structural parameters such as the hole diameter and the thickness of the holed steel plate on the initial translational stiffness is analysed,and the orthogonal analysis method is used to optimize the combination of the above five parameters.The research results show that the error between the initial translational stiffness of the PBL node calculated by the method proposed in this paper and the finite element calculation is within 8.0%;compared with the method of calculating the translational displacement of the web member by solving the triangle,the second theorem is used.Not only can the calculation be simplified,but also can the accumulation of errors caused by multiple calculation deformations in the process of solving the triangle be reduced;the stiffness of the web members contributes the most to the overall translational stiffness of the PBL node,which can reach 82.5%;the strength of the concrete in the original design is kept unchanged,increasing the web rod diameter by 20 mm,the steel web rod wall thickness by 4mm,the perforated plate hole diameter by 4 mm,and the perforated steel plate thickness by 4mm can increase the theoretical initial translational stiffness of the PBL node by about 25.7%. |
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