Chapter 22 - Evaluation of Collapse Loads of Reticulated Domes under Seismic Motions

Abstract

This chapter presents an evaluation of collapse loads of high- and low-rise reticulated domes under self-weight (gravity load) and earthquake motions in relation with static ultimate strength and corresponding vertical critical displacement, by carrying out elastic plastic dynamic response analysis. Collapse acceleration for high-rise domes under horizontal ground motions can be evaluated by the base shear coefficient and critical member strength. For low-rise domes under vertical and horizontal ground motions, collapse acceleration can be related with static critical displacement and maximum elastic vertical displacement response at a specific node in domes. The chapter investigates the dynamic collapse of single-layer reticulated domes (SRD) by elastic plastic dynamic response analysis applied to the high-rise and low-rise domes, with pre-assigned static safety factors v, against static collapse loads, and under earthquake motion time histories. Spatial reticulated structures to be built in seismic areas of earthquake prone countries must be designed for the effects imposed on them by strong earthquake motions, in addition to their design for usual loads.