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Performance-based seismic assessment of skewed bridges with and without considering soil-foundation interaction effects for various site classes

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Earthquake Engineering and Engineering Vibration 2014年第3期13卷 357-373页

作者： Abdoul R.Ghotbi Civil & Environmental Engineering Department University of California

The seismic behavior of skewed bridges has not been well studied compared to straight bridges. skewed bridges have shown extensive damage, especially due to deck rotation, shear keys failure, abutment unseating and column- bent drift. This research, therefore, aims to study the behavior of skewed and straight highway overpass bridges both with and without taking into account the effects of Soil-Structure Interaction （SSI） due to near-fault ground motions. Due to several sources of uncertainty associated with the ground motions, soil and structure, a probabilistic approach is needed. Thus, a probabilistic methodology similar to the one developed by the Pacific Earthquake Engineering Research Center （PEER） has been utilized to assess the probability of damage due to various levels of shaking using appropriate intensity measures with minimum dispersions. The probabilistic analyses were performed for various bridge configurations and site conditions, including sand ranging from loose to dense and clay ranging from soft to stiff, in order to evaluate the effects. The results proved a considerable susceptibility of skewed bridges to deck rotation and shear keys displacement. It was also found that SSI had a decreasing effect on the damage probability for various demands compared to the fixed-base model without including SSI. However, deck rotation for all types of the soil and also abutment unseating for very loose sand and soft clay showed an increase in damage probability compared to the fixed-base model. The damage probability for various demands has also been found to decrease with an increase of soil strength for both sandy and clayey sites. With respect to the variations in the skew angle, an increase in skew angle has had an increasing effect on the amplitude of the seismic response for various demands. Deck rotation has been very sensitive to the increase in the skew angle; therefore, as the skew angle increased, the deck rotation responded accordingly. Furthermor

关键词： skewed bridges SSI demand model probabilistic assessment damage probability

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Development of the applicability of simplified Henry’s method for skewed multicell box-girder bridges under traffic loading conditions

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第12期13卷 915-925页

作者： Iman MOHSENI A.R.Khalim RASHID Department of Civil Engineering Universiti Kebangsaan Malaysia(National University of Malaysia)

Concrete precast multicell box-girder(MCB) bridges combine aesthetics with torsional stiffness *** analytical studies indicate that currently available specifications are unable to consider the effect of the twisting moment(torsional moment) on bridge *** straight bridges the effect of torsion is negligible and the transverse reinforced design is governed by other ***,in the case of skewed bridges the effect of the twisting moment should be ***,an in-depth study was performed on 90 concrete MCB bridges with skew angles ranging from 0° to 60°.For each girder the bridge actions were determined under the American Association of State Highway and Transportation Officials(AASHTO) live load *** analytical results show that torsional stiffness and live load positions greatly affected the bridges' *** addition,based on a statistical analysis of the obtained results,several skew correction factors are proposed to improve the precision of the simplified Henry's method,which is widely used by bridge engineers to predict bridge *** relationship between the bending moment and secondary moments was also investigated and it was concluded that all secondary actions increase with an increase in skewness.

关键词： Distribution factor Live loads skewed bridges Grillage analysis

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