Development of a shear-link model including local buckling for nonlinear analysis of eccentrically braced steel frames

Date

2026-1-22

Author

Çöklü, Mitat Mert

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This thesis proposes a computationally efficient framework within OpenSees for modeling the cyclic behavior of wide flange shear links used in eccentrically braced frames. Two key modeling components are introduced. First, a uniaxial material wrapper is implemented within the multi-axial nDFiber material to enable uncoupled fiber response by assigning distinct uniaxial constitutive models to the relevant strain components at the fiber level. Second, a WMFiber section integration rule is developed to explicitly separate web and flange fiber assemblies in wide-flange sections, enabling component-wise control of section behavior. The proposed implementation is verified through targeted analytical studies and evaluated against experimental and analytical benchmarks reported in the literature. Results demonstrate that the framework reproduces link hysteresis with good accuracy and captures local buckling–induced strength and stiffness degradation in long links using a frame-element formulation.

Subject Keywords

Steel Shear Links, Nonlinear Structural Analysis, OpenSees, Local Buckling, Constitutive Modeling of Materials

URI

https://hdl.handle.net/11511/118696

Collections

Graduate School of Natural and Applied Sciences, Thesis