ANALYSIS OF CONCRETE CONSTRUCTION LIVE LOADS ON NEWLY POURED SLABS

The stochastic modeling of construction loads on newly poured slabs du ring construction of multistory concrete buildings is presented in thi s paper. The purpose of the study is to calculated the equivalent unif ormly distributed load (EUDL), i.e., the uniform load that will produc e (statistically) the same load effect in formwork members as the actu al live loads. To achieve this objective the spatial correlation of co nstruction live loads as well as the influence surfaces of various for mwork member load effects must be determined. In this study, the const ruction live load covariance function is modeled as an exponential fun ction. Influence surfaces for formwork shore axial forces and stringer bending moments and shear forces are also investigated for several fo rmwork designs. The statistical moments and a distribution function fo r construction live load EUDLs are presented. The 0.99 fractiles of EU DLs are compared with the current design load specifications for slab formwork design. Load reduction equations are presented for slab formw ork design loads.