scholarly journals Investigation of the transverse and longitudinal moments at the transverse free end of deck slab cantilevers subjected to CHBDC truck loading

2021 ◽  
Author(s):  
Hanieh Pourmand
Keyword(s):  
Parametric Study ◽  
Free Edge ◽  
Highway Bridge ◽  
Design Code ◽  
Cantilever Length ◽  
Truck Loading ◽  
Design Values ◽  
Length Variable ◽  
Girder Bridge ◽  
Deck Slab

Clause 5.7.1.3 of the Canadian Highway Bridge Design Code (CHBDC) specifies an equation for the calculation of transverse moment intensity (My) in the deck slab cantilever due to truck loading in a slab-on-girder bridge system. Also, it states that the transverse moment intensity shall be assumed 2My for the locations within a distance equal to cantilever length of the transverse free end of the deck slab cantilever. However, CHBDC design values do not consider the effects of barrier length, variable thickness of the barrier wall and shape of the cantilever’s edge stiffening on the response. In addition, the longitudinal moment on the deck slab cantilever due to truck loading is as yet unavailable. Thus, a parametric study was conducted, using the finite element modelling, to investigate the effect of these key parameters in the transverse and longitudinal moments at the region of the transverse free edge of deck slab cantilever. Based on the data generated from this parametric study, imperial equations for the transverse and longitudinal moments at the transverse end of the deck slab cantilever were deduced.

scholarly journals Investigation of the transverse and longitudinal moments at the transverse free end of deck slab cantilevers subjected to CHBDC truck loading

2021 ◽  
Author(s):  
Hanieh Pourmand
Keyword(s):  
Parametric Study ◽  
Free Edge ◽  
Highway Bridge ◽  
Design Code ◽  
Cantilever Length ◽  
Truck Loading ◽  
Design Values ◽  
Length Variable ◽  
Girder Bridge ◽  
Deck Slab

Clause 5.7.1.3 of the Canadian Highway Bridge Design Code (CHBDC) specifies an equation for the calculation of transverse moment intensity (My) in the deck slab cantilever due to truck loading in a slab-on-girder bridge system. Also, it states that the transverse moment intensity shall be assumed 2My for the locations within a distance equal to cantilever length of the transverse free end of the deck slab cantilever. However, CHBDC design values do not consider the effects of barrier length, variable thickness of the barrier wall and shape of the cantilever’s edge stiffening on the response. In addition, the longitudinal moment on the deck slab cantilever due to truck loading is as yet unavailable. Thus, a parametric study was conducted, using the finite element modelling, to investigate the effect of these key parameters in the transverse and longitudinal moments at the region of the transverse free edge of deck slab cantilever. Based on the data generated from this parametric study, imperial equations for the transverse and longitudinal moments at the transverse end of the deck slab cantilever were deduced.

scholarly journals Load distribution in concrete solid slab bridges

2021 ◽  
Author(s):  
Muhammad Ishtiaq
Keyword(s):  
Parametric Study ◽  
Plate Theory ◽  
Torsional Rigidity ◽  
Empirical Equations ◽  
Design Code ◽  
Shell Elements ◽  
Shear Distribution ◽  
Truck Loading ◽  
The Moment ◽  
Slab Bending

Canadian Highway Bridge Design Code (CHBDC) specifies empirical equations for the moment and shear distribution factors for selected bridge configurations. These empirical equations were based on the orthotropic plate theory with equivalent slab bending and torsional rigidity. Also, they were based on analysis procedure and CHBDC truck loading condition slightly different from those specified in the current CHBDC code of 2006. In this study, a parametric study was conducted, using the finite-element modeling to determine the moment and shear distribution factors for solid slab bridges subjected to CHBDC truck loading. Shell elements were used to model the bridge deck slab supported over bearings on each side of the bridge at 1.2 m spacing. The results from the parametric study were correlated to those available in the CHBDC code. Results show considerable difference in FEA results and CHBDS equations, especially for shear distribution factors. This project provides research results that can be used further to develop more reliable expressions for moment and shear distribution factors for solid slab bridges.

scholarly journals Load distribution in concrete solid slab bridges

2021 ◽  
Author(s):  
Muhammad Ishtiaq
Keyword(s):  
Parametric Study ◽  
Plate Theory ◽  
Torsional Rigidity ◽  
Empirical Equations ◽  
Design Code ◽  
Shell Elements ◽  
Shear Distribution ◽  
Truck Loading ◽  
The Moment ◽  
Slab Bending

Canadian Highway Bridge Design Code (CHBDC) specifies empirical equations for the moment and shear distribution factors for selected bridge configurations. These empirical equations were based on the orthotropic plate theory with equivalent slab bending and torsional rigidity. Also, they were based on analysis procedure and CHBDC truck loading condition slightly different from those specified in the current CHBDC code of 2006. In this study, a parametric study was conducted, using the finite-element modeling to determine the moment and shear distribution factors for solid slab bridges subjected to CHBDC truck loading. Shell elements were used to model the bridge deck slab supported over bearings on each side of the bridge at 1.2 m spacing. The results from the parametric study were correlated to those available in the CHBDC code. Results show considerable difference in FEA results and CHBDS equations, especially for shear distribution factors. This project provides research results that can be used further to develop more reliable expressions for moment and shear distribution factors for solid slab bridges.

Calibration of the Ontario Highway Bridge Design Code 1991 edition

1994 ◽  
Vol 21 (1) ◽  
pp. 25-35 ◽  
Author(s):  
Andrzej S. Nowak ◽  
Hid N. Grouni
Keyword(s):  
Reinforced Concrete ◽  
Reliability Analysis ◽  
Prestressed Concrete ◽  
Highway Bridge ◽  
Live Load ◽  
Design Code ◽  
Reliability Indices ◽  
Resistance Factors ◽  
Load And Resistance Factors ◽  
Selection Of

The paper describes the calculation of load and resistance factors for the Ontario Highway Bridge Design Code (OHBDC) 1991 edition. The work involved the development of load and resistance models, the selection of the reliability analysis method, and the calculation of the reliability indices. The statistical models for load and resistance are reviewed. The considered load components include dead load, live load, and dynamic load. Resistance models are developed for girder bridges (steel, reinforced concrete, and prestressed concrete). A reliability analysis is performed for selected representative structures. Reliability indices are calculated using an iterative procedure. The calculations are performed for bridge girders designed using OHBDC 1983 edition. The resulting reliability indices are between 3 and 4 for steel girders and reinforced concrete T-beams, and between 3.5 and 5 for prestressed concrete girders. Lower values are observed for shorter spans (up to 30–40 m). The acceptance criterion in the selection of load and resistance factors is closeness to the target reliability level. The analysis confirmed the need to increase the design live load for shorter spans. Partial resistance factors are considered for steel and concrete. The criteria for the evaluation of existing bridges are based on the reliability analysis and economic considerations. Key words: bridge code, calibration, load factor, resistance factor, reliability index.

Revisiting arching in deck slabs

1996 ◽  
Vol 23 (4) ◽  
pp. 973-981 ◽  
Author(s):  
Baidar Bakht
Keyword(s):  
Design Method ◽  
Field Tests ◽  
Scale Model ◽  
Girder Bridges ◽  
Transverse Arch ◽  
Deck Slabs ◽  
Arching Action ◽  
Girder Bridge ◽  
Concrete Deck ◽  
Deck Slab

The arching action in concrete deck slabs of girder bridges is generally recognized and is utilized by the Ontario Highway Bridge Design Code, and some other codes, to specify an empirical design method which leads to considerable savings in the amount of reinforcement. Despite this general recognition, there are some aspects of the arching action that are yet to be explored. To the knowledge of the author, all reported laboratory and field tests on deck slabs exploring its arching action under applied loads have been conducted by measuring strains in the bottom transverse reinforcement midway between the girders. Based on the results of tests on a full-scale model of a deck slab, it has been confirmed in this note that the transverse bottom reinforcement in the deck slab acts as a tie to the internal transverse arch in the slab. Because of embedment in concrete, the force in this reinforcement is the smallest midway between the girders, and not the largest as would be the case if the slab were in pure bending. Key words: arching in slabs, deck slabs, girder bridge, punching shear, steel-free deck slabs.

Equivalent area of voided slabs

1998 ◽  
Vol 25 (4) ◽  
pp. 797-801 ◽  
Author(s):  
Leslie G Jaeger ◽  
Baidar Bakht ◽  
Gamil Tadros
Keyword(s):  
Simple Expression ◽  
Technical Note ◽  
Axial Stiffness ◽  
Highway Bridge ◽  
Slab Thickness ◽  
Design Code ◽  
Bridge Design ◽  
Equivalent Thickness ◽  
Simple Alternative ◽  
Equivalent Area

In order to calculate prestress losses in the transverse prestressing of voided concrete slabs, it is sometimes convenient to estimate the thickness of an equivalent solid slab. The Ontario Highway Bridge Design Code, as well as the forthcoming Canadian Highway Bridge Design Code, specifies a simple expression for calculating this equivalent thickness. This expression is reviewed in this technical note, and a simple alternative expression, believed to be more accurate, is proposed, along with its derivation. It is shown that the equivalent solid slab thickness obtained from consideration of in-plane forces is also applicable to transverse shear deformations, provided that the usual approximations of elementary strength of materials are used in both cases.Key words: axial stiffness, equivalent area, shear deformation, transverse prestressing, voided slab, slab.

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