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Title:

Side-by-Side Box-Beam Bridge Superstructure: Rational Transverse Posttension Design

Accession Number:

01123031

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States

Abstract:

Side-by-side box-beam bridge superstructure system is often specified for rapid bridge construction. A common performance concern with this bridge type is the longitudinal reflective deck cracking directly above the joints between precast beams. Empirical design procedures modified frequently since the 1950’s in the US and abroad were not able to abate the longitudinal reflective deck cracking. It is postulated that the cracking is due to underestimation of the load demand at the joints. The reason for the demand uncertainty is the lack of accurate analysis models. A few analysis models for side-by-side box-beam superstructure system are discussed in literature. Due to oversimplifications incorporated in those models, accurate load response could not be obtained. A simple but powerful analysis model, that has been developed based on the macromechanics concept, is presented here. The objective here is to present the use of the macromechanical analysis model in conjunction with AASHTO LRFD stipulations to calculate the transverse moment demand along the longitudinal joints between precast beams. These calculations are used to design the level of transverse posttension, assuring crack control. Numerical example presented herein is compatible with the current practice where transverse connection is established with grouted shear-keys, transverse posttension through diaphragms at discrete locations, and a 150 mm (6 in.) cast-in-place concrete deck. The transverse posttension design calculation details are also provided.

Monograph Accession #:

01120148

Report/Paper Numbers:

09-3420

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Attanayake, Upul Bandara
Aktan, Haluk M

Pagination:

18p

Publication Date:

2009

Conference:

Transportation Research Board 88th Annual Meeting

Location: Washington DC, United States
Date: 2009-1-11 to 2009-1-15
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References (22) ; Tables (3)

Uncontrolled Terms:

Beam bridges; Reflective cracking

Subject Areas:

Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls

Source Data:

Transportation Research Board Annual Meeting 2009 Paper #09-3420

Files:

TRIS, TRB

Created Date:

Jan 30 2009 7:49PM