Three Dimensional Analysis Of Skeletal Structures Considering Cracking

Abstract

A three dimensional computer model has been developed to analyze space structures containing cracked members. A new stiffness matrix for cracked space members has been obtained. This model takes into consideration crack surface mixed mode displacements due to the presence of axial and shearing forces and bending and torsional moments. Based on the present analysis, the redistribution of internal forces and moments and deformations in structural members can be obtained taking into consideration the effect of crack size and location and geometry of the structure. Examples of place frame, plane grid and space frame have been analyzed using a computer program developed based on the present model. This analysis can be employed to identify overstressed regions in plane or space structures due to members cracking.