详情

原文传递 Live Load Distribution Factors for Washington State SR 18/SR 516 Overcrossing

题名：	Live Load Distribution Factors for Washington State SR 18/SR 516 Overcrossing
作者：	Paul Barr, John Stanton, Marc Eberhard
关键词：	Live-load distribution, skew, diaphragms, continuity, lifts
摘要：	This report presents an evaluation of live-load distribution factors for a series of three-span, prestressed concrete girder bridges. The response of one bridge, measured during a static live-load test, was used to evaluate the reliability of a finite-element model. Twenty-four variations of this model were then used to evaluate the procedures for computing live-load distribution factors that are embodied in three bridge design codes. The finite-element models were also used to investigate the effects that lifts, intermediate diaphragms, end diaphragms, continuity, skew angle and load type have on distribution 1 actors. For geometries similar to those considered in the development of the American Association of State Highway and Transportation Officials (AASHTO) Load and Resistance Factor Design (IJRFD) Specifications (1994), the distribution factors computed with the finite-element models were within 6 percent of the code values. However, for the geometry of the bridge that was tested, the discrepancy was 28 percent Lifts, end diaphragms, skew angle and load type significantly decreased the distribution factors, while continuity and intermediate diaphragms had the least effect If the bridge had been designed using the distribution factors calculated with the finite-element model rather than the code values, the required concrete release strength could have been reduced by 6.9 Mpa (10(X) psi), or the live load could have been increased by 39 percent
报告类型：	科技报告