Effects of foundation soil stiffness on the 3-D modal characteristics and seismic response of a highway bridge

Ouanani, Mouloud; Tiliouine, Boualem

doi:10.1007/s12205-013-0435-5

Cited by 17 publications

(6 citation statements)

References 25 publications

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“…The soil parameters for soil modeling were taken from the (Rahvar 2005) and (Rahvar 2006a) for soil class B and C respectively, and soil parameters of Kathmandu valley were taken into consideration for soil class D as soil parameter classified by [11]. The above soil are taken under the consideration of soil profiles classified by (ATC, 1996;FEMA356, 2000) [15]. The shear-wave velocity of soil in different places of Kathmandu valley was less than 180 m/s [12; 11].…”

Section: Methodsmentioning

confidence: 99%

Evaluation of Soil Structure Interaction Effects on Seismic Response of RC Framed Buildings Using Simplified Method

Timilsina,

Ghimire,

Chaulagain

2023

Struct. Mech. of Eng. Const. and Build

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In the current practice for the design of the building structure is done by considering the footing as fixed based. The mid-rise buildings having variation in storey height from 3- to 10-storey were selected for the research. In this research, analysis was done to study into the interaction between the seismic response of RC-framed buildings and the soil-structure for various soil types. To study the linear responses of the structures, the model was developed in FEM software SAP2000. The underneath soil was modelled by using direct method, where the soil is considered as solid element. The considered depth of soil was considered 30 m and the viscous spring dashpot were applied to avoid the reflection of seismic waves in soil medium along the effective horizontal soil boundaries. The seismic response variables such as maximum lateral deflection, inter-storey drift and fundamental time periods have been studied. SSI amplified the lateral deflection, inter-storey drift and time period of structure shifting the performance level from life safety to near collapse level. Fundamental time period of the first mode was increased by 23 % for very soft soil. The maximum lateral deflection of 10-storey building for very soft soil was amplified up to 282 % for Kobe and the performance level was shifted from life safety (1.5 %) to collapse level for all the considered model for soil type D . The performance level of structure was checked against the different soil types on varying storey height and finally a simplified method has been proposed to incorporate the effects of SSI in fixed base structures.

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Section: Methodsmentioning

confidence: 99%

Evaluation of Soil Structure Interaction Effects on Seismic Response of RC Framed Buildings Using Simplified Method

Timilsina,

Ghimire,

Chaulagain

2023

Struct. Mech. of Eng. Const. and Build

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“…SSI is inter-disciplinary (geotechnical and structures) and past work on the subject reflect bias based on the discipline. Many studies related to the influence of SSI on structural performance assumed elastic, non-degrading superstructure (Vlassis and Spyrakos, 2001;Ouanani & Tiliouine, 2015) or used foundation choices that were not designed according to the prevailing design practices (Chen & Lai, 2003;Grange et al, 2011;Ni et al, 2014) and thus accentuated the impact of SSI on structural performance and modal parameters. Other studies considered elaborate models for nonlinear behavior of structural elements but did not include SSI based on the prevailing assumption of beneficial effect of SSI (Kalkan & Kwong, 2011;Şadan et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of modal parameters of multi-span bridges to SSI and pier column inelasticity and its implications for FEM model updating

Chaudhary

2020

Lat. Am. j. solids struct.

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Modal parameters, determined through forced vibration testing, ambient vibrations or seismic excitations, are central to the structural health monitoring process for bridges. These parameters are used to obtain highfidelity numerical models through FEM model updating by fine-tuning mass, stiffness and boundary conditions and matching the numerical and observed modal parameters. This study investigated sensitivity of modal parameters to changes in boundary conditions (soil-structure interaction effect) and pier column inelasticity (stiffness effect) through more than 450 non-linear dynamic time-history analysis of an ordinary multi-span bridge. The bridge system was founded on shallow foundations in five rock profiles and on pile foundations in five soil profiles and was subjected to 21 seismic ground motions of varying intensity (0.036 to 0.61g). Modal frequencies showed sensitivity to the SSI and pier column inelasticity effects for low and higher levels of seismic excitations respectively. Mode shapes, on the contrary, were insensitive to SSI as well as pier column inelasticity for all levels of seismic excitations.

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“…In the flexible soil environment, the acceleration of structures is strongly affected by SSI [2,5]. Considerable damage noticed in regions with soft soil profile through (1985Mexico city, 1989Loma Prieta, 1994 Northridge and 1995 Kobe) earthquakes, damage to structures affected by these earthquakes discovered that SSI plays a crucial role in the response of structures to earthquake loads [6][7][8]. To take into account the impact of SSI, certain analytical methods have been developed from the above-mentioned earthquakes data and others recorded from instrumented sites, moreover, using the calibration of numerical methods and constituent models.…”

Section: Introductionmentioning

confidence: 99%

“…The natural periods are shorter and the damping values are lower for the structures with the fixed base than for those with a flexible base [10,23]. In recent decades, the linear elastic soil hypothesis was fundamentally used for SSI modeling [7]. Although, there are convenient methods and several different applications that can be used to realistically represent nonlinear and dynamic behaviors.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fixed-Base and Soil Structure Interaction on the Dynamic Responses of Steel Structures

2020

IJETER

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To study soil-structure interaction (SSI) and create an exact computer model of soils, geotechnical and geological studies are necessary. Since these investigations are neglected for most projects for various reasons, engineers use the fixed base concept to analyze the structures. This study examines the accuracy and effect of fixed-base concept on the dynamic responses of steel structures. For this purpose, the dynamic responses in terms of base shear and top displacement of a four-story steel structure were studied by using SAP2000 finite element software.The structure rested on a big soil medium that was numerically modelled in a full 3D manner using solid finite elements, four different soil profiles in well-known seismic codes were defined (Rock, Very dense, Stiff and Soft soils). Provided information in the codes and the equations of the literature were utilized for numerical modeling. After performing finite element analysis, a comparison was made between the dynamic responses of the fixed base structure with structures rested on different types of the soil profile. According to the results of the analysis, it was observed that the base shear and the top displacement of the fixed base structure are almost the same with the structure resting on the rocky soil, but underestimated comparing to remaining soil profiles.

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Effects of foundation soil stiffness on the 3-D modal characteristics and seismic response of a highway bridge

Cited by 17 publications

References 25 publications

Evaluation of Soil Structure Interaction Effects on Seismic Response of RC Framed Buildings Using Simplified Method

Evaluation of Soil Structure Interaction Effects on Seismic Response of RC Framed Buildings Using Simplified Method

Sensitivity of modal parameters of multi-span bridges to SSI and pier column inelasticity and its implications for FEM model updating

Effect of Fixed-Base and Soil Structure Interaction on the Dynamic Responses of Steel Structures

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