Yield line analysis of an AASHTO New Jersey concrete parapet wall
Calloway, Benita R.
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Concrete bridge rails are rated according to three performance levels. For classification at a given performance level, the rail must meet specific strength and geometric requirements. To meet the strength requirement, the rail must be able to satisfactorily withstand a transverse concentrated load applied at the top of the rail. This load is called Ft (kips) and is listed for each performance level in the Draft NCHRP Project 12-33 document entitled Development of a Comprehensive Bridge Specification and Commentary. Researchers at the Texas Transportation Institute have developed equations to determine Rw (kips), the total transverse resistance of a rail (which must be greater than or equal to Ft), and Lc (ft), the critical length of wall failure (Hirsch 1978). These equations (referred to as Hirsch equations is this study) were developed by yield line analysis for a constant thickness concrete parapet wall.
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