The manufacturing process of cold-formed steel members induces cold work which has a significant effect on their structural performance. In order to assess this cold-working effect, residual stresses and equivalent plastic strains need to be quantified. A finite element-based method was recently proposed by the authors for predicting the coexistent residual stresses and plastic strains in cold-formed steel hollow sections. In the present study, this finite element-based method was employed to carry out a parametric study in order to generate numerical data of the residual stresses and coexistent equivalent plastic strains in cold-formed steel elliptical hollow sections (EHS) for a wide range of steel grades (including both normal grade steels and high strength steels) and section sizes. By analyzing these numerical data, simplified models for residual stresses and coexistent equivalent plastic strains in cold-formed steel EHS are proposed. The simplified models can be employed to define the initial states of cold-formed steel EHS members in a nonlinear finite element analysis for their structural performance, and thus can be used to examine the cold-working effect on the member behavior in future studies.

冷弯型钢构件的制造过程引起冷作，这对其结构性能产生重大影响。为了评估这种冷加工效果，需要对残余应力和等效塑性应变进行量化。作者最近提出了一种基于有限元的方法来预测冷弯型钢空心截面中同时存在的残余应力和塑性应变。在本研究中，采用这种基于有限元的方法进行参数研究，以生成冷弯型钢椭圆形空心截面（EHS）中的残余应力和同时存在的等效塑性应变的数值数据。钢种（包括普通等级钢和高强度钢）和截面尺寸。通过分析这些数值数据，提出了冷弯钢EHS中残余应力和共存等效塑性应变的简化模型。简化的模型可用于在结构有限元非线性分析中定义冷弯型钢EHS构件的初始状态，从而可在以后的研究中用于检查冷加工对构件性能的影响。