A step-by-step liberalized procedure for ultimate analysis of space structure

World Congress and Exhibition on Construction & Steel Structure

November 16-18, 2015 Dubai, UAE

Wail N Al-Rifaie and Najla�a H S Al-Asady

1Philadelphia University, Jordan 2University of Technology-Baghdad, Iraq

Posters-Accepted Abstracts: J Civil Environ Eng

Abstract :

The simplest available theory for predicting the maximum load carrying capacity of steel frames is the simple (or rigid) plastic theory, and test results on adequately stabilized beams and single-story rigid frames have shown quite satisfactory agreement between the observed and predicted maximum loads. As in linear elastic analysis, simple plastic theory also presupposes that deformations have a negligible effect upon the equilibrium equations when formulated for the original unloaded shape of structures. The neglect of deformation moments in simple plastic theory can lead to an over-estimation of frame strength. The agreement between observed and calculated collapse loads in tests on frames of mild steel has been attributed to the compensating action of strain hardening and deformation moments, both of which are ignored in the simple plastic theory. Accepting that, the simple plastic theory for predicting the strength of steel frames has its limitations, the load factor for plastic failure (�»p) as determined by this theory is still an important frame parameter and for all structures except the simplest ones, the manual methods for computing (�»p) can be tedious and requires, for a rapid solution, a considerable amount of work and intuition concerning the likely mode of failure. Once the generality of the matrix computer methods for linear elastic frame analysis had been recognized, it was natural to expect that attention would be concentrated on the various types of non-linear analysis. The theoretical work presented in this paper is an extension to the method developed by Al-Rifaie and Trikha for the elastic-plastic analysis of plane frame to deal with elastic-plastic analysis of space frame. The method is based on step-by-step linearized procedure based on displacement approach in which the members are assumed to possess infinite rigidity over the size of the connections at their ends for the elastic-plastic analysis of steel frames.

Biography :

Email: wnrifaie@yahoo.com