effect of ibbiog io bending and tortitnal resistance of box tupe structures.

in his paper the effect of ribbing in bending and tortional resisance of the box type structure is discussed . for satisfactory design of press structures . the stiffness characteristics of individual components are recognised to be of primary importance. heavy press stucures are normaly constructed in double-sided form . because of transportation and handing problems , these frames are usually broken into four pieces (bed, columns, and crown) which are tied to each other by means of four tie rods. these four parts are of box type structure and different methods of ribbing are used to reinforce them. in this research a thin walled box type model has been considered as the base model. different forms of ribbing have been used to reinforce the base model. as a result, different models have been formed. these models have been subjected to both bending and tortional loads. considering a suitable boundary condition, models have been analysed using finite element method. having the results of these analyses, displacements of some typical points in different models have been compared. these comparisons have been done through suitable curves and bar charts. besiders , displacements have been shown graphically. the results of this paper can be used, as a guideline, in designing the machine tool structures, specially press structures.