Soil structure interaction

About: Soil structure interaction is a research topic. Over the lifetime, 3653 publications have been published within this topic receiving 48890 citations.

Seismic soil-structure interaction of buildings on hill slopes

Abstract: In hilly regions, engineered construction is constrained by local topography resulting in the adoption of either a step-back or step-back-set-back configuration as a structural form for buildings. The adopted form invariably results in a structure which is irregular by virtue of varying column heights leading to torsion and increased shear during seismic ground motion. To capture the real behavior of buildings on hill slope a 3-D analysis of the building is required. In the present study, static pushover analysis and Response spectrum analysis (RSA) have been conducted on five building i.e. three step back buildings and two step back-set back buildings with varying support conditions. These buildings have been analyzed for different soil conditions (hard, medium and soft soils) idealized by equivalent springs. The response parameters, i.e. total base shear (V), displacement from pushover analysis (δ performance point), displacement from RSA (δ elastic) and response correction factor (R’) have been studied with respect to fixed base analysis to compare the effect of soil springs. In general it is found that response reduction factor decreases with increasing time period, but is expected to be constant beyond a certain value of time period.

Ssi and sssi effects in seismic analysis of twin buildings: discrete model concept

Abstract: This paper presents a numerical study of soil-structure interaction (SSI) and structure-soil-structure interaction (SSSI) effects on response of twin buildings during earthquake excitations. The buildings are modeled as shear buildings and the soil is simulated by a discrete model representing a visco-elastic half-space subjected to earthquake acceleration. Equation of motion of twin buildings with different conditions, fixed based (FB), SSI and SSSI, are developed via an analytical procedure and solved numerically. Buildings responses are evaluated for aforementioned three conditions considering various soil types and compared together. One must say that soil causes change in distribution of responses throughout the buildings while ignoring soil interaction may lead to detrimental effects on buildings. Anyway, interaction between twin buildings with SSSI condition slightly mitigates soil unfavorable effects compare to one building with SSI condition. In addition, it is found that influence of so...

Dynamic amplification factor concept of soil layers: a case study in İzmir (Western Anatolia)

Abstract: Dynamic soil amplification factor (DAF) defining which ratio earthquake acceleration will reach the soil surface by changing is one of the most important factors in seismic risk studies. When computing the value of DAF at a point without a strong motion station, peak horizontal acceleration values (PGA) at the bedrock and soil transfer function are needed. PGA value at the bedrock can be obtained by using either real seismic records or the earthquake scenario. However, the soil transfer function (soil transfer function) can be computed observationally and theoretically. Observational soil transfer function is defined by microtremor horizontal/vertical spectral ratio. In case of theoretical computation, the density belonging to the soil layers between the bedrock and the soil surface is used together with the change of P-S wave rates with the depth and the damping factor. In this study, the dynamic amplification factor (DAF) has been computed and mapped for 57 points by using observational soil transfer functions obtained by microtremor horizontal/vertical spectral ratio as well as the earthquake scenario at a new city center located within the metropolitan area of Izmir. Also, theoretical soil transfer function at 1 point was obtained through spatial autocorrelation method (SPAC) study and determined to be compatible with observational result. It was observed that both peak period values are higher than 1 s and DAF values are higher than 2 throughout the area. Also, according to the soil profile obtained from the SPAC study, S wave rate changes up to a depth of 1300 m showing that acoustic impedance differences may occur in the frequencies and the magnitudes of the earthquake waves. The fact that peak period values obtained from microtremor studies are higher than 2 s supports this result. This means that acoustic impedance differences likely to occur in these depths should also be taken into consideration while computing the dynamic amplification factor.