عنوان مقاله [English]
نویسنده [English]چکیده [English]
Plate girders structure is a major industry which is mainly used in the systems covered by these beams. Reducing deflection and decreasing the maximum bending moment can be considered as a development in methodology. By the use of cross beamsor braced beams, element perpendicular to the girders is provided. In this paper, the effect of stiffness and distance elements development are studied. Differential equation of degree four governing the behavior of the partial structures which is a quadratic relationship is determined by solving the following mathematical transformations, and the fundamental equations are derived. The resulting equations are solved by a practical problem and the answer to the problem .The modeling results are compared with the SAP2000 program. The findingsshow highly accurate implementation and compliance. It is also revealed that stiffness changing elements within the cross can include different amounts of stress, bending moment and improved cover system.