A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Stability of steel columns strengthened under preload: Numerical study with experimental validation
Abstract Steel structures are often strengthened under a preload, which is defined as the existing load on the structure during the strengthening process. This study aims to understand the preload effect on the stability of strengthened steel columns. A numerical study on steel columns strengthened by bolted steel profiles under a preload is presented. Finite element (FE) models are developed and verified using experimental results. Furthermore, a parametric study is conducted with 242 FE models on parameters, including the preload, strengthened section properties, column length, and bolt configuration. The numerical results indicate that the preload effect on the ultimate load capacity can be beneficial, negligible, or adverse, ranging from −17% to 8%. The preload effect is found to be dependent on the preload level, section geometry, steel properties, and column length. Subsequently, a prediction model is proposed, wherein the preload effect is expressed as a function of the preload level and normalized slenderness. The prediction model is validated by existing experimental results and found capable of providing practically accurate predictions.
Graphical abstract Display Omitted
Highlights Finite element models of steel columns with bolted strengthening were developed and verified by experimental results. The preload effect on the ultimate load capacity of strengthened steel columns can be either beneficial or adverse. The preload effect depended on the preload level, section geometry, steel property, and column length. A prediction model for the preload effect was proposed and validated using existing experimental results.
Stability of steel columns strengthened under preload: Numerical study with experimental validation
Abstract Steel structures are often strengthened under a preload, which is defined as the existing load on the structure during the strengthening process. This study aims to understand the preload effect on the stability of strengthened steel columns. A numerical study on steel columns strengthened by bolted steel profiles under a preload is presented. Finite element (FE) models are developed and verified using experimental results. Furthermore, a parametric study is conducted with 242 FE models on parameters, including the preload, strengthened section properties, column length, and bolt configuration. The numerical results indicate that the preload effect on the ultimate load capacity can be beneficial, negligible, or adverse, ranging from −17% to 8%. The preload effect is found to be dependent on the preload level, section geometry, steel properties, and column length. Subsequently, a prediction model is proposed, wherein the preload effect is expressed as a function of the preload level and normalized slenderness. The prediction model is validated by existing experimental results and found capable of providing practically accurate predictions.
Graphical abstract Display Omitted
Highlights Finite element models of steel columns with bolted strengthening were developed and verified by experimental results. The preload effect on the ultimate load capacity of strengthened steel columns can be either beneficial or adverse. The preload effect depended on the preload level, section geometry, steel property, and column length. A prediction model for the preload effect was proposed and validated using existing experimental results.
Stability of steel columns strengthened under preload: Numerical study with experimental validation
Wang, Sizhe (author) / Su, Qingtian (author) / Jiang, Xu (author) / Ghafoori, Elyas (author)
2022-07-19
Article (Journal)
Electronic Resource
English
Ultimate Load Capacity of Columns Strengthened under Preload
| British Library Conference Proceedings | 1999