Abstract
The Japanese design specifications for highway bridges are now under revision. The revision aims mainly at implementing recent advancement of bridge engineering and updating/correcting design rules and equations if necessary. In the volume for steel bridges, several topics have been picked up and worked out. One of the issues is the design of a member subjected to bending moment. Specifically, the evaluation for P-δ effect, the formula for the equivalent bending moment and the way to deal with non-prismatic members are investigated in this paper. As a result, a new equation for P-δ effect is proposed, the validity of the formula for the equivalent bending moment is confirmed and a method for the design of non-prismatic members is tried out.
