Hysteretic Performance of Square Steel Pipe Concrete Frame with Vertically Stiffened Thin Steel Plate Shear Wall

Literature Overview

This paper by Wang Xiantie, Jia Guiqiang, Li Jin, Chen Fengmei, Luo Yao, and Zheng Jiang, published in the Journal of Xi'an University of Architecture and Technology (Natural Science) in 2017 (Vol. 49, No. 5, pp. 637-645), investigates the hysteretic performance of a square steel pipe concrete frame combined with vertically stiffened thin steel plate shear walls. The research was supported by the National Natural Science Foundation of China (51678474) and the Shaanxi Provincial Natural Science Foundation (2015JM5170). A 1/3 scale single-bay two-story structural model was subjected to low-cycle reversed loading tests, and nonlinear numerical analysis was conducted using ABAQUS finite element software. Full-scale models were also analyzed to study the effects of column axial compression ratio, stiffener quantity, steel plate wall thickness ratio, and column flexibility coefficient on hysteretic performance.

Core Technical Findings

The experimental and numerical results demonstrate that the square steel pipe concrete frame with vertically stiffened thin steel plate shear walls exhibits excellent seismic performance. The low-cycle reversed loading tests reveal stable hysteretic loops with good energy dissipation capacity, indicating that this structural system is well-suited for seismic-resistant applications.

Parametric Study Results

The parametric study provides valuable insights into how different design parameters influence the structural performance. Increasing the column axial compression ratio reduces both load-bearing capacity and ductility, but has relatively minor effects on hysteretic energy dissipation and stiffness degradation. The number of stiffeners significantly affects hysteretic energy dissipation capacity but has limited influence on load-bearing capacity and stiffness degradation. The steel plate wall thickness ratio and column flexibility coefficient exert substantial effects on load-bearing capacity, hysteretic energy dissipation, and stiffness degradation.

Comparison of Experimental and Numerical Results

The ABAQUS nonlinear finite element analysis results are in good agreement with the experimental test results, validating the numerical modeling approach. This agreement provides confidence in using finite element analysis as a design tool for this structural system, allowing engineers to efficiently evaluate different design configurations without extensive physical testing.

Engineering Practice Implications

The research provides engineers with a comprehensive understanding of how to optimize the design of square steel pipe concrete frames with vertically stiffened thin steel plate shear walls for seismic applications. The finding that stiffener quantity primarily affects energy dissipation rather than load capacity suggests that stiffeners should be designed to meet energy dissipation requirements while maintaining adequate load-bearing capacity through other design means. The significant influence of plate wall thickness ratio on multiple performance metrics indicates that this parameter should be carefully controlled during design to achieve the desired balance between strength, ductility, and energy dissipation.

The column flexibility coefficient emerges as a critical design parameter that significantly affects overall structural performance. Engineers should carefully consider the relative stiffness between the steel pipe concrete columns and the steel plate shear walls to ensure that the intended load path and failure mechanism are achieved. The good agreement between experimental and numerical results validates the use of finite element analysis for detailed design and optimization of these structural systems.

Study Insights and Reflections

This research makes a significant contribution to the understanding of hybrid steel-concrete structural systems for seismic-resistant construction. The combination of square steel pipe concrete columns with vertically stiffened thin steel plate shear walls represents an innovative structural system that leverages the advantages of both materials. The systematic parametric study provides clear design guidelines for engineers, enabling them to optimize structural performance for specific seismic design requirements. The validation of the finite element modeling approach through experimental comparison is particularly valuable, as it establishes a reliable computational tool for the detailed design of these complex structural systems. The research demonstrates that careful attention to design parameters such as stiffener quantity, plate wall thickness ratio, and column flexibility coefficient is essential for achieving optimal seismic performance.