Seismic soil–structure interaction analysis of structure with shallow foundation using response spectrum method

2020 ◽  
Vol 18 (8) ◽  
pp. 3517-3543
Author(s):  
Zhidong Gao ◽  
Mi Zhao ◽  
Xiuli Du ◽  
Xu Zhao
Keyword(s):  
Soil Structure ◽  
Interaction Analysis ◽  
Response Spectrum ◽  
Shallow Foundation ◽  
Soil Structure Interaction ◽  
Response Spectrum Method ◽  
Structure Interaction ◽  
Spectrum Method

scholarly journals Soil-structure interaction analysis considering concrete creep and shrinkage

2018 ◽  
Vol 11 (3) ◽  
pp. 564-585 ◽  
Author(s):  
L. M. P. ROSA ◽  
B. R. DANZIGER ◽  
E. M. L. CARVALHO
Keyword(s):  
Structural Analysis ◽  
Structural Design ◽  
Soil Structure ◽  
Interaction Analysis ◽  
Shallow Foundation ◽  
Soil Structure Interaction ◽  
Foundation Design ◽  
Concrete Creep ◽  
Structure Interaction ◽  
Creep And Shrinkage

Abstract The paper presents some results from Rosa’s [1] research that aimed to verify the effect of creep and shrinkage of the concrete in soil-structure interaction. The construction consists in a 17 storeys building. It is set down on shallow foundation, in the central part of the construction, and steel piles, on the boundary. The structure was submitted to instrumentation during construction, including the monitoring of foundation settlements and columns deformation. It was possible to compare the structural design with a numerical refined structural analysis. Comparisons of the structural and foundation design with and without due consideration of soil-structure interaction are also presented. Finally, the different design assumptions were confronted with instrumentation results, both related to foundation settlements and to columns loading as well. Attention is pointed out on the effect of concrete creep and shrinkage in the soil-structure interaction analysis.

scholarly journals Seismic soil-structure interaction analysis of wind turbine support structures using augmented complex mode superposition response spectrum method

2021 ◽  
Author(s):  
Masaru Kitahara ◽  
Takeshi Ishihara
Keyword(s):  
Wind Turbine ◽  
Soil Structure ◽  
Response Spectrum ◽  
Soil Structure Interaction ◽  
Support Structures ◽  
Complex Mode ◽  
Structure Interaction ◽  
Mode Superposition ◽  
Spectrum Method ◽  
Seismic Loadings

Abstract. In this study, the seismic soil-structure interaction (SSI) of wind turbine support structures is investigated using response spectrum method (RSM) based on the complex eigenmodes. Seismic loadings on wind turbine support structures are newly derived by complex mode superposition RSM. To improve the prediction accuracy of the shear force acting on footings, this method is augmented by introducing the upper limit of modal damping ratios of 10 %. In addition, the bending moment at the hub height due to the mass moment of inertia of rotor and nacelle assembly is considered as an additional loading. The proposed method is validated by comparison with time history analysis (THA) accounting for different types of foundations and different tower geometries. Seismic loadings acting on the towers and footings by the proposed method show favourable agreement with the mean results by THA of several input acceleration time histories, while the original complex mode superposition RSM strongly underestimates shear forces acting on footings.

State-of-the-Art Techniques for Seismic Soil-Structure Interaction Analysis of Steel Gravity Structures

2014 ◽  
Author(s):  
Frederick Tajirian ◽  
Mansour Tabatabaie ◽  
Basilio Sumodobila ◽  
Stephen Paulson ◽  
Bill Davies
Keyword(s):  
Soil Structure ◽  
State Of The Art ◽  
Interaction Analysis ◽  
Layered Soil ◽  
Soil Structure Interaction ◽  
Soil System ◽  
Cyclonic Storm ◽  
Structure Interaction ◽  
Analysis Methods ◽  
Moderate Seismicity

The design of steel jacket fixed offshore structures in zones of moderate seismicity is typically governed by Metocean loads. In contrast the steel gravity structure (SGS) presented in this paper, is a heavy and stiff structure. The large mass results in foundation forces from seismic events that may exceed those created by extreme cyclonic storm events. When computing the earthquake response of such structures it is essential to account for soil-structure interaction (SSI) effects. Seismic SSI analysis of the SGS platform was performed using state-of-the-art SSI software, which analyzed a detailed three-dimensional model of the SGS supported on layered soil system. The results of this analysis were then compared with those using industry standard impedance methods whereby the layered soil is replaced by equivalent foundation springs (K) and damping (C). Differences in calculated results resulting from the different ways by which K and C are implemented in different software are presented. The base shear, overturning moment, critical member forces and maximum accelerations were compared for each of the analysis methods. SSI resulted in significant reduction in seismic demands. While it was possible to get reasonable alignment using the different standard industry analysis methods, this was only possible after calibrating the KC foundation model with software that rigorously implements SSI effects. Lessons learned and recommendations for the various methods of analysis are summarized in the paper.

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