Response of Truss Structures Subjected to Dynamic Loads During Member Failure

by Ramesh B. Malla, (M.ASCE), Univ of Connecticut, Storrs, United States,
Butchi Nalluri, Univ of Connecticut, Storrs, United States,

Document Type: Proceeding Paper

Part of: Spatial, Lattice and Tension Structures


The paper presents a method for and results from an investigation of the response of a truss structure during the chain reaction of its member failure while subjected to external static and dynamic loadings. The main emphasis is to include dynamic effects of progressive member failure on the overall behavior of the structure. The member failure is considered to be sudden. The methodology adopted in the study takes into account the member failure effects by applying external forces, that are equivalent to the reduction in the member capacity of the failed members, at the joints where the two ends of the damaged member are connected with rest of the structure. For a compressive member that buckles and snaps through into inelastic postbuckling regime, the material is considered to be elastic-perfectly plastic having reduced yield stress. A three-dimensional double-layer grid truss structure subjected to external static and harmonic dynamic loads is analyzed. Results presented include natural frequencies, displacements, stresses, and/or forces.

Subject Headings: Dynamic loads | Failure analysis | Trusses | Structural failures | Structural analysis | Structural dynamics | Failure loads

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