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The difference of strain energy is concentrated on joint area between beam and shell modeling of box channel structures. Therefore, the analysis errors from the beam modeling are basically due to this strain energy difference. At concept design stage of automotive body we usually use the beam model. However, this kind of error at joint area is so dominant on the analysis that a correct beam modeling technique is necessary. There are some conventional beam modeling techniques in this problem. The most widely used one is using spring elements at the joint area. But the spring element has some problems in application to sensitivity analysis because it is a zero dimension element which does not have material properties and section properties such as mass, area, etc.