详情

原文传递 Distribution Factors for Construction Loads and Girder Capacity Equations

题名：	Distribution Factors for Construction Loads and Girder Capacity Equations
作者：	Consolazio, G. R.; Honig, J. M.
关键词：	Distribution factors##Construction load##Highway bridge decks##Structural safety##Florida (state)##Thermal sweep##Girder stability##Wind load##Florida-I Beam (FIBs)##
摘要：	During the process of constructing a highway bridge, there are several construction stages that warrant consideration from a structural safety and design perspective. The first objective of the present study was to use analytical models of prestressed concrete girders (Florida-I Beams) at multiple stages of construction to update previously developed capacity equations for wind load and gravity load. Updated analytical bridge models were developed that accounted for a revised definition of lateral girder sweep—one that accounted for both maximum allowable fabrication tolerance as well as transverse thermal gradients (i.e., thermally induced sweep). Subsequently, analytical parametric studies were conducted to update—using the revised definition of sweep—previously developed girder capacity equations. The updated capacity equations take into consideration different Florida-I Beam cross-sections, span lengths, wind loads, skew angles, and brace stiffness's. A second objective in this study was to use finite element analyses of partially constructed bridge systems—consisting of multiple Florida-I Beam (FIBs) with construction loads—to quantify distribution factors for interior and exterior girder end shear forces and maximum girder moments. A large-scale parametric study was conducted with consideration of different Florida-I Beam cross-sections, span lengths, girder spacing, deck overhang widths, skew angles, number of girders, number of braces, and bracing configurations (K-brace and X-brace) to quantify shear and moment distribution factor data. These data were subsequently used to develop empirical construction stage distribution factor (DF) equations at multiple levels of design conservatism.
总页数：	133
报告类型：	科技报告