Abstract
ABSTRACTJoints play an important role in design and performance of steel structures. Recently, two European projects, EQUALJOINTS (1) and EQUALJOINTS+ (2), addressed seismic prequalification of four types of moment resisting beam‐to‐column joints: extended end‐plate joints with haunches, stiffened and unstiffened extended end‐plate joints and dog‐bone joints. Beam‐to‐column joints with haunches are frequently employed by structural engineers in seismic design of steel moment resisting frames. Their large stiffness and strength allows coping with stringent drift limitation requirements and avoiding experimental validation of partial‐strength/semi‐rigid ones requested by Eurocode 8 (EC8). In current design practice, when modelling steel frames, the finite size of the joints is often neglected for the reasons of simplifying the task. The present paper examines the potential benefits of explicitly modelling beam‐to‐column joints with haunches in structural analysis, and aims at identifying possible simplifications of the structural model, accounting the advantages, but, at the same time, keeping the model as simple as possible. Two types of steel structures are addressed within this study: moment resisting frames and dual frames combining moment resisting frames with eccentrically braced frames. The two configurations are designed and their seismic performance is assessed, using different modelling approaches.
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