详情

Adjustable Cross-frames for the Erection of Steel Girder Bridges

项目名称：	Adjustable Cross-frames for the Erection of Steel Girder Bridges
摘要：	This project will develop novel, cost-effective adjustable cross-frames for curved and highly skewed steel girder bridges that will enable necessary geometry adjustments in adjacent girders for fit-up while providing a single, permanent cross-frame. Work in Stage 1 will focus on conceptual design of the novel adjustable cross-frames as well as understanding bounds on desired adjustability and developing detailed control sequences. Bounds on what adjustability is needed and whether minor or major adjustment is warranted will be determined. High-fidelity finite element (FE) numerical analyses of 4-5 prototype structures during erection will be performed to determine bounds on girder twist and deflection. Conceptual design will be performed to develop forms for adjustable cross-frames to meet necessary geometric adjustments. For each adjustable cross-frames form, models developed in the earlier task will be used to understand forces developed through jacking and track relative motions of each girder of the prototype structures during adjustment. A control sequence will then be developed for each form. In Stage 2, concepts developed in Stage 1will be numerically evaluated relative to one another and to conventional rigid cross-frames for the prototype structures. A scaled prototype of the most promising design will be built, evaluated, and demonstrated. Research will culminate in recommendations on adjustable cross-frames, including bounds on its applicability.
状态：	Active
资金：	135000
资助组织：	National Cooperative Highway Research Program<==>Federal Highway Administration<==>American Association of State Highway and Transportation Officials (AASHTO)
项目负责人：	Jawed, Inam
执行机构：	University of Notre Dame
开始时间：	20210101
主题领域：	Bridges and other structures；Design；Highways