An axial semi-rigid connection model for cross-type transverse branch plate-to-CHS joints. (15th February 2019)

• Record Type: Journal Article
• Authors: Zhao, Bi D.; Chen, Yu; Liu, Cheng Q.; Wu, Han D.; Wang, Tao; Wei, Xiao D.
• Is Part Of: Engineering structures. Volume 181(2019)
• Page Start: 413
• Page End: 426
• Publication Date: 2019-02-15
• Subjects: Cross-type transverse branch plate-to-CHS joint -- Axial initial stiffness -- Semi-rigid connection model -- Axial load-local deformation curves -- 7 parameters; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.12.042
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Develops a model to predict the semi-rigid performance of branch plate-to-CHS joint. FE model for X-type branch plate-to-CHS joints is calibrated by test results. Simplified theoretical formula for axial initial rigidity of the joints is created. Parametric study on 7 parameters is carried out and their formulas are established. Comparison analysis results show the axial semi-rigid model has a good reliability. Abstract: This study is aimed to develop a model to accurately predict the semi-rigid performance of branch plate-to-circular hollow section (CHS) joints for tubular structures. First of all, a finite element (FE) model for cross-type transverse branch plate-to-CHS (CTTPCHS) joints is calibrated by test results. Based on the improved Menegotto-Pinto equation and the axial load-local deformation curves that are resulted from the calibrated FE model, an axial semi-rigid connection model for CTTPCHS joints is established, which has 7 parameters including the axial initial stiffness. Then, the method to obtain 7 parameters is determined, and a theoretical formula for axial initial stiffness of the joints is established based on the quarter-circular arch model. The complex expression of the formula is simplified to the product of an exponential function and a power function. In addition, a numerical parametric study on 7 parameters is carried out by the calibrated FE model. And based on the results of parametric analysis and multivariate nonlinear regression analysis, the parametric formulas for the 7 parameters are established. Finally, a comparison between the FE analysis results and the semi-rigid connection model calculation results from the parametric formulas is made, which shows the axial semi-rigid connection model a good reliability.