Design Optimization on Diaphragm Stiffness and Spacing of Steel-Box Girder Bridges with a Single-Cell Section

단실단면을 갖는 강박스 거더교의 다이아프램의 강성과 간격에 관한 설계 최적화

Generally, diaphragms are installed in the box girder to prevent or decrease the distortion of tile cross section. In engineering practice, diaphragms are spaced in 5m intervals without reasonable basis. ANd the usual diaphragm type is solid-plate type. It is considered to be noneconomical design to the almost design engineers. In this paper, the parametric study was performed to present the design proposal about the diaphragm stiffness and spacing only in tire single cell box girder. For that, the distortional warping normal stress, bending normal stress and transverse bending normal stress were analyzed using finite element program 'SMB' for the accurate structural analysis.