ABSTRACT
This chapter discusses truss girders that have simply supported spans and bear vertical loads. The method of moment point is to construct the section cutting a truss into two parts in such a manner that all axial lines of the cut members but one are concurrent at the same point. The method of projections lies in constructing the section that cuts a truss into two parts and setting up the equation of force balance for one of the parts in projection on some axis. The method of joints is an important special case of the projection method, when the part of the truss under investigation is a single joint. The method of substitute members may be employed for stability verification of a hinged system which complies with the condition of static determinacy. The problem of diminishing the weight of truss structures while keeping its bearing capacity is resolved by means of secondary truss members.
