Analysis and Optimization of Mechanical Properties in Steel Structure Joint Connection Design

Abstract

The performance of steel structure joint connections directly impacts the overall structural safety and economy. Traditional design methods struggle to effectively balance the various performance indicators of joints, which constrains the optimized development of steel structure engineering. This study establishes a refined finite element model considering initial imperfections to systematically analyze the stress distribution patterns and force transfer mechanisms within the joint connection zone, thereby revealing the hysteretic behavior and failure evolution mechanism of the joint under cyclic loading. Based on parametric analysis results, a multi-objective optimization mathematical model for joints is constructed, targeting load-bearing capacity, stiffness, and energy dissipation capacity. An optimization strategy combining surrogate models and evolutionary algorithms is adopted, yielding a balanced Pareto optimal solution set. The research results demonstrate that the comprehensive mechanical performance of the joint can be significantly enhanced through the collaborative optimization of key parameters such as end-plate thickness, bolt spacing, and stiffener configuration, thus providing a new theoretical basis and methodological support for the refined design of steel structure joints.