A Simplified Model on Strength and Stiffness of Outrigger Truss in Super High rise Structure

Abstract:

This paper investigates the performance of the outrigger truss with monoclinic web member (N type) through experiment and finite element analysis. A simplified model for the outrigger truss based on truss mechanism and frame mechanism is established. By the model, the mechanism of plastic resistance can be revealed. In addition, both the strength and stiffness of the outrigger truss can be obtained through numerical program. It is observed that among all the members, the diagonal web has the greatest impact on the strength and stiffness of outrigger. The calculation results of strength and stiffness index from FEM are close to that from the simplified calculation model, indicating that the proposed model and the calculation method can be applied to the preliminary design of outrigger truss.

Key words:super high rise structure; outrigger truss; simplified model; finite element analysis; load; stiffness