Research

Although structural analysis software for design purposes includes hysteresis models that simulate the behavior of wide flange members, their full structural characteristics have yet to be fully understood. We are pursuing the further potential of wide flange members by effectively combining fundamental structural experiments with analytical approaches. 

Cold-formed steel (CFS) members achieve highly efficient structural forms through optimized cross-sectional shapes. However, due to the complexity of these shapes, multiple buckling modes can occur, making structural design extremely challenging. We are undertaking the challenge of discovering new buckling phenomena and establishing corresponding design methodologies. 

In Japan, these members are commonly used as columns and are well recognized. Through extensive experimental investigations, we have published leading research findings that position us at the forefront of this field globally. 

This research aims to replicate the behavior of structural members up to the strain level, comparable to physical experiments, using finite element analysis. By identifying material hardening laws that can accurately capture the cyclic behavior of steel, we evaluate the seismic performance of steel structural members. 

This research aims to reduce the amount of steel used in buildings and thereby contribute to CO₂ emission reductions by promoting the thinning of structural members and optimizing buckling design. It represents a culmination of efforts to fully leverage the advantages of thin-walled steel members. 

A user-friendly analysis program is being developed to allow structural evaluation without requiring prior expertise in the finite element method (FEM). Building on the longstanding research achievements of the Igarashi Laboratory, the program assesses the structural performance of H-shaped beam members with integrated stiffeners and slabs.