The concept of Reduced Beam Section (RBS) connections in steel framed buildings have been widely adopted in previous studies as well as European and American Design codes (EN1998-3, ANSI/AISC 358-16 and FEMA 350) as a means of providing safe ductile fuse behaviour in the beam in order to protect the column from any significant damage. However, modelling the hysteretic behaviour of RBS connections under earthquake excitations can be challenging due to their non-linear complex behaviour. This paper presents a database of detailed and accurate modified-Ibarra–Krawinkler (mIK) models that can reliably capture the cyclic hysteresis behaviour of fully welded RBS connections over a wide range of different RBS geometries. An experimentally validated Finite Element (FE) model was developed using ABAQUS to accurately predict the cyclic hardening and strength degradation of RBS connections. Subsequently, a comprehensive parametric study was conducted on 1480 different American wide flange RBS and full section beams under cyclic loading. The results were then used to assess the influence of key RBS design parameters on the structural performance of the connections. It was shown that the conventional method of predicting mIK parameters cannot accurately capture the actual hysteresis behaviour of some RBS connections and may lead to unreliable predictions. Using the results of the validated FE models, a comprehensive database of 1480 different beams was developed which provides: (1) the beams full cyclic moment–rotation-hysteresis at the plastic hinge location up to 0.07 rad rotation following the SAC loading protocol, (2) appropriate mIK parameters to accurately capture the beam’s cyclic response in OpenSees, for non-linear dynamic analysis. The results of this study should prove useful in seismic design and assessment of RBS connections.

在以前的研究以及欧洲和美国设计规范（EN1998-3、ANSI/AISC 358-16 和 FEMA 350）中，钢框架建筑中减少梁截面 (RBS) 连接的概念已被广泛采用，作为提供安全的一种手段。梁中的韧性熔断器行为，以保护柱子免受任何重大损坏。然而，由于 RBS 连接的非线性复杂行为，对地震激发下 RBS 连接的滞后行为进行建模可能具有挑战性。本文提供了一个详细而准确的修改 Ibarra-Krawinkler (mIK) 模型的数据库，该模型可以可靠地捕获全焊接 RBS 连接在各种不同 RBS 几何形状上的循环滞后行为。使用 ABAQUS 开发了经过实验验证的有限元 (FE) 模型，以准确预测 RBS 连接的循环硬化和强度退化。随后，对 1480 种不同的美国宽翼缘 RBS 和循环载荷下的全截面梁进行了全面的参数研究。然后将结果用于评估关键 RBS 设计参数对连接结构性能的影响。结果表明，预测 mIK 参数的传统方法无法准确捕捉某些 RBS 连接的实际滞后行为，并可能导致预测不可靠。使用经过验证的有限元模型的结果，开发了一个包含 1480 个不同梁的综合数据库，该数据库提供：（1）梁在塑性铰位置处的全循环力矩-旋转-滞后高达 0。07 rad 旋转遵循 SAC 加载协议，(2) 适当的 mIK 参数以在 OpenSees 中准确捕获光束的循环响应，用于非线性动态分析。这项研究的结果应该证明对 RBS 连接的抗震设计和评估很有用。