en موتور احتراق داخلی Internal Combustion Engines (ICE, ...) پژوهشي Research Automotive design engineers face the challenging problem of developing products in highly competitive markets. In this regard, using conceptual models in the first step of automotive development seems so necessary. In this paper, to make a body in white conceptual model, an engineering approach is developed for the replacement of beam-like structures, joints, and panels in a vehicle model. The proposed replacement methodology is based on the reduced beam, joint, and panel modeling approach, which involves a geometric analysis of beam member cross-sections and a static analysis of joints. In order to validate the proposed approach, an industrial case-study is presented. Two static load cases are defined to compare the original and the concept model by evaluating the stiffness of the full vehicle under torsion and bending in accordance with the standards used by automotive original equipment manufacturer (OEM) companies. The results show high accuracy of the concept models in comparison with the original model in bending and torsional stiffness prediction. Concept Modeling, Body in white, Beam, Joint, Panel, Bending stiffness, Torsional Stiffness 2370 2377 http://ase.iust.ac.ir/browse.php?a_code=A-10-230-2&slc_lang=en&sid=1 M. Mohseni Kabir 180031947532846002427 180031947532846002427 Yes M. Izanloo 180031947532846002428 180031947532846002428 No Ab. Khalkhali 180031947532846002429 180031947532846002429 No