This paper presents a methodology for the development of two creep models for the welds and the steel base material that are capable of predicting the thermal creep behavior of transverse welded lap joints. This methodology is based on the experimental program of the thermal creep effect on transverse welded lap joints conducted previously as a part of this research. The experimental results are in the form of creep curves and they are used to develop a Norton–Bailey power law creep equation for the welded lap joints. Then, two creep models for the welds and steel base material are proposed by introducing temperature-dependent scaling factors to the Norton–Bailey power law creep equation of the welded lap joints. Finite element (FE) simulations are then developed in ABAQUS to predict the thermal creep behavior of the welded lap joint using the two proposed creep models for the welds and the steel base material. The two creep models are calibrated by changing the power law creep constants in order to predict the experimental creep curves with reasonable accuracy. Another series of FE simulations is conducted using Fields and Fields creep model for the steel base material instead of the proposed one for comparison purposes. The weld and structural steel creep models are intended to support the development of modeling the creep behavior of large-scale welded connections for structural-fire engineering application.

本文提出了一种为焊缝和钢母材开发两种蠕变模型的方法，这些模型能够预测横向焊接搭接接头的热蠕变行为。该方法基于先前作为本研究的一部分进行的横向焊接搭接接头的热蠕变效应实验程序。实验结果以蠕变曲线的形式出现，它们被用于开发焊接搭接接头的诺顿-贝利幂律蠕变方程。然后，通过将与温度相关的比例因子引入Norton-Bailey模型，提出了焊缝和钢基材的两种蠕变模型。焊接搭接接头的幂律蠕变方程。然后在 ABAQUS 中开发有限元 (FE) 模拟，以使用两种建议的焊缝和钢母材蠕变模型来预测焊接搭接接头的热蠕变行为。通过改变幂律蠕变常数来校准两个蠕变模型，以便以合理的精度预测实验蠕变曲线。另一系列有限元模拟是使用Fields 和 Fields蠕变模型进行钢基材的，而不是为了比较目的而建议的模型。焊接和结构钢蠕变模型旨在支持开发用于结构-火灾工程应用的大型焊接连接的蠕变行为建模。