Fatigue of Prestressed Composite Steel Bridge Girders

美国的许多公路桥梁由于老化、环境影响以及承受不了今天的重负荷而处于日益恶化的状态。为了延长一些桥梁的剩余寿命，可以用各种方法对它们进行加固。本项目将探讨通过对钢梁进行预应力加固以提高其承载能力的可行性。该项目延续了先前的研究项目，该项目研究了加固组合钢梁的静强度、延性、可靠性和荷载挠度特性。这一阶段的研究重点将集中在加固后的组合钢梁的疲劳强度上。

Many highway bridges in the United States are in a deteriorating condition as a result of aging, environmental effects, and inadequate strength for today's heavy loads. To extend the remaining life of some of the bridges it is possible to strengthen them by various methods. This project will investigate the feasibility of strengthening steel bridge girders by prestressing the girder to increase its load supporting capabilities. This project follows a previous project which is investigating the static strength, ductility, reliability and load-deflection characteristics of the strengthened composite steel girder. The emphasis for this phase of the investigation will focus on the fatigue strength of the strengthened composite steel girders.