Seismic behavior of a post-tensioned integral bridge including soil–structure interaction (SSI)

Abstract The present study assesses the effect of Structure-Soil-Structure-Interaction (SSSI) on the seismic behavior of three dissimilar adjacent bridges by comparing their seismic responses with the seismic response of the isolated bridge including Soil-Structure-Interaction (SSI). To this end, an extensive series of numerical analyses have been carried out to elicit the effects of Structure-Soil-Structure-Interaction (SSSI) on the seismic behavior of three dissimilar bridges with different superstructure masses. The studied bridges are based on groups of piles founded in nonlinear clay. A parametric study has been performed for configurations of three dissimilar bridges with superstructure masses ratios of 200% and 300%, concentrating on the influence of the inter-bridge spacing, and the geometrical position of the bridges towards each other and towards the seismic excitation direction. The numerical analyses have been conducted using a three-dimensional finite difference modeling software FLAC 3D (Fast Lagrangian analysis of continua in 3 dimensions). The results of the numerical simulations clearly show that the seismic responses of the dissimilar grouped bridges were strongly influenced by the neighboring bridges. In particular, the results reveal a salient positive impact on the acceleration of the superstructure by a considerable drop (up to 90.63%) and by (up to 91.27%) for the internal forces induced in the piles. Comparably, the influence of bridge arrangement towards the seismic loading were prominent on both of superstructure acceleration and the internal forces in the piles. The responses were as much as 27 times lesser for the acceleration and 11 times smaller for the internal forces than the response of the isolated bridge. Contrarily, the inter-bridge spacing has a limited effect on the seismic response of the grouped bridges.

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Temperature‐driven fatigue life of reinforced concrete integral bridge pile considering nonlinear soil–structure interaction

Structural Concrete ◽

10.1002/suco.202000049 ◽

2020 ◽

Author(s):

Manoj Verma ◽

Shambhu Sharan Mishra

Keyword(s):

Reinforced Concrete ◽

Fatigue Life ◽

Soil Structure ◽

Soil Structure Interaction ◽

Structure Interaction ◽

Integral Bridge

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Influence of soil-structure interaction on the dynamic response of continuous and integral bridge subjected to moving loads

International Journal of Rail Transportation ◽

10.1080/23248378.2019.1632753 ◽

2019 ◽

Vol 8 (3) ◽

pp. 285-306 ◽

Cited By ~ 1

Author(s):

Anand M. Gharad ◽

Ranjan S. Sonparote

Keyword(s):

Dynamic Response ◽

Soil Structure ◽

Soil Structure Interaction ◽

Moving Loads ◽

Structure Interaction ◽

Integral Bridge

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Seismic behavior of structures considering uplift and soil–structure interaction

Advances in Structural Engineering ◽

10.1177/1369433217693628 ◽

2017 ◽

Vol 20 (11) ◽

pp. 1712-1726

Author(s):

Farhad Behnamfar ◽

Seyyed Mohammad Mirhosseini ◽

Hossein Alibabaei

Keyword(s):

Seismic Behavior ◽

Soil Structure ◽

Nonlinear Dynamic Analysis ◽

Steel Structures ◽

Soil Structure Interaction ◽

Structure Interaction ◽

Nonlinear Seismic Response ◽

Tensile Forces ◽

Fixed Base ◽

Flexible Base

A common assumption when analyzing a structure for earthquake forces is that the building is positively attached to a rigid ground so that it can sustain possible tensile forces without being detached, or uplifted, from its bearing points. Considering the facts that almost no tension can be transferred between a surface foundation and soil and soft soils interact with the supported structure during earthquakes, in this research, the effects of uplift and soil–structure interaction on nonlinear seismic response of structures are evaluated. Several reinforced concrete and steel structures under different suits of consistent ground motions are considered. The base of the buildings is modeled with vertical no-tension springs being nonlinear in compression. The total soil–structure interaction system is modeled within OpenSees, and the seismic behavior is evaluated using a nonlinear dynamic analysis. The nonlinear responses of buildings are determined and compared between three cases: fixed base, flexible base without uplift, and flexible base with uplift. The cases for which uplift in conjunction with soil–structure interaction should be considered are identified.

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