Construction Load Distributions for Laterally Braced Framework

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Title: Construction Load Distributions for Laterally Braced Framework

Author(s): K. Mosallam and W.F. Chen

Publication: Structural Journal

Volume: 89

Issue: 4

Appears on pages(s): 415-424

Keywords: beams (supports); columns (supports); formwork (construction); loads (forces); moments; multistory buildings; reinforced concrete; shoring; structural analysis; Structural Research

Date: 7/1/1992

Abstract:
Several designers and researchers have proposed methods for analyzing the loads on slabs supported by shores and reshores in multistory concrete buildings during construction. Despite this significant effort, the present state of knowledge is still incomplete. Except for the suggestion by some researchers that shores should be braced to resist lateral loading, lateral loads and temporary lateral bracing have been neglected in almost all the previous works. Also, multistory concrete building frames have been analyzed for years by the conventional one-step method, which assures that all the design loads are imposed only after the frame has been completed up to its roof level. Examining the mode of incidence of the load, it is evident that part of the load is applied in stages as the construction of the frame proceeds, whereas the remaining part of it is imposed upon completion of the frame. In this paper, a three-dimensional computer model capable of simulating the concrete construction process is developed. The model accounts for the interaction of gravity and lateral loads, and can include temporary lateral bracing elements in the supporting assembly. The effect of the construction process in the analysis of multistory concrete buildings was investigated by analyzing a multistory building with and without the simulation of construction process.