Load Distribution Factors in Simply Supported Skew Bridges

Khaloo, Alireza; Mirzabozorg, H.

doi:10.1061/(asce)1084-0702(2003)8:4(241)

Cited by 57 publications

(21 citation statements)

References 9 publications

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“…Ali R Khaloo and Mirzabozorg [5] (2003) analyzed simply supported "slab on girder" bridges with concrete I girders using FEM approach (with the aid of ANSYS software) and AASHTO loadings. The assumptions of his work are 1) The bridge decks consist of slab on five concrete I section longitudinal girders.…”

Section: International Journal Of Advance Engineering and Research Dementioning

confidence: 99%

Variation of Shear Coefficient and Reaction Coefficient with Span in Skew Bridges

2017

IJAERD

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Section: International Journal Of Advance Engineering and Research Dementioning

confidence: 99%

Variation of Shear Coefficient and Reaction Coefficient with Span in Skew Bridges

2017

IJAERD

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“…5 Although skew generally decreases extreme force effects due to live load, it produces negative moments at the deck corners and torsional moments within the end zones and redistributes reaction forces at the supports. 6 Therefore, for estimating live load effects in skewed bridge components, design specifications such as AASHTO LRFD 5 (American Association State Highway Transportation Officials Load and Resistance Factor Design, 2010) require the application of skew correction factors (SCFs) to the live load distribution factors (LLDFs) obtained for straight bridges when the bridge is skewed. The LLDFs and SCFs available in AASHTO and in similar bridge design specifications are developed solely for regular jointed bridges as standard design methods for IBs have not been fully established yet.…”

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confidence: 99%

Critical Truck Loading Pattern to Maximize Live Load Effects in Skewed Integral Bridges

Dicleli

Yalçin

2014

Structural Engineering International

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An integral bridge (IB) is one in which the abutments are cast monolithically with the deck to form a rigid frame structure. When the geometry and conditions do not allow for designing straight IBs, skewed IBs (SIBs) are designed. Current bridge design specifications are mainly developed for regular jointed bridges. Thus, provisions for SIBs have not been included in these specifications yet. Consequently, to determine live load effects in SIB components, many practicing engineers built a three-dimensional (3D) finite element model (FEM). In this study, various multiple design truck loading patterns are investigated to determine the most critical loading pattern producing the maximum live load effects in SIB components. The results of the analyses reveal that in the case of SIBs, different truck loading patterns arise when compared to bridges with no skew. Trucks that are placed diagonally across the width of the bridge are observed to produce the most unfavorable live load effects in bridge components.Keywords: skewed integral bridges; live loads; truck loading pattern; girder; abutment; pile.centerline of the bridge deck is defined as skew angle (q ) as shown in Fig. 1b. Currently, two-thirds of the bridge inventory in the USA is skewed. 5 Although skew generally decreases extreme force effects due to live load, it produces negative moments at the deck corners and torsional moments within the end zones and redistributes reaction forces at the supports. 6 Therefore, for estimating live load effects in skewed bridge components, design specifications such as AASHTO LRFD 5 (American Association State Highway Transportation Officials Load and Resistance Factor Design, 2010) require the application of skew correction factors (SCFs) to the live load distribution factors (LLDFs) obtained for straight bridges when the bridge is skewed. The LLDFs and SCFs available in AASHTO and in similar bridge design specifications are developed solely for regular jointed bridges as standard design methods for IBs have not been fully established yet. 7 Thus, many practicing engineers either incorrectly use the provisions for regular jointed skewed bridges in current bridge design specifications or build a three-dimensional (3D) finite element model (FEM) to estimate the live load effects in SIB components (girders, abutments, and piles). In the 3D FEM, accurate positioning of the design trucks in the transverse and longitudinal directions of the bridge is very important in estimating the maximum live load effect in SIB components. This is also equally important for future research studies related to the development of LLDFs for SIBs, where the LLDFs are obtained by dividing the results of 3D FEM of the bridge subjected to single or multiple truck loading (Fig. 2a) by the results of corresponding idealized two-dimensional (2D) frame model of the same bridge (Fig. 2b) under a single truck loading. 8 For straight IBs, the longitudinal position of the design trucks in a 3D FEM to create the maximum live load effect in the IB components ma...

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“…Some researchers suggest new equations of live load distribution factor for moment and shear based on the data generated from the parametric study on skew continuous slab on girder bridges (Bishara et al, 1993;Khaleel and Itani, 1990). Recent investigation indicated that, however, the effect of secondary components were not taken into account in current bridge design standards, the presence of intermediate diaphragms (ID) highly influence shear and moment distribution factor of skewed bridges (Barr et al, 2001;Cai et al, 2009;Khaloo and Mirzabozorg, 2003;Li and Ma, 2010).…”

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Transverse load distribution of skew cast-in-place concrete multicell box - girder bridges subjected to traffic condition

Mohseni

Rashid

2013

Lat. Am. j. solids struct.

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Load Distribution Factors in Simply Supported Skew Bridges

Cited by 57 publications

References 9 publications

Variation of Shear Coefficient and Reaction Coefficient with Span in Skew Bridges

Variation of Shear Coefficient and Reaction Coefficient with Span in Skew Bridges

Critical Truck Loading Pattern to Maximize Live Load Effects in Skewed Integral Bridges

Transverse load distribution of skew cast-in-place concrete multicell box - girder bridges subjected to traffic condition

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