Soil-structure interaction analysis using a 1DT-3C wave propagation model

Abstract

The soil-structure interaction (SSI) is generally neglected for seismic design of ordinary buildings. A modeling technique is proposed to facilitate the integration of SSI in building design, considering rocking effects and the shallow foundation deformability. The proposed technique is suitable when the soil can be considered as horizontally layered. The one-directional three-component wave propagation is numerically simulated in a T-shaped horizontally layered soil domain assembled with a three-dimensional (3D) frame structure. A 3D soil model is used until a fixed depth and a 1D model is supposed to be a sufficient approximation in deeper soil layers. The 1DT-3C wave propagation approach is inspired by the consideration that SSI is detected in the near-surface soil layers. The proposed modeling approach is verified by comparison with a fully 3D model for vertical propagation in horizontally layered soil and periodic lateral boundary condition. The 1DT-3C wave propagation modeling technique is used to investigate the building response and SSI effects that vary with the frequency content of seismic loading and building-to-soil frequency ratio, respectively.

Optical flow method for measuring deformation of soil specimen subjected to torsional shearing

“…The measured torque and twist angle allow calculation of tangential stress and shear strain which are then used for Kirchhoff's modulus G estimation. Precise control of small torque amplitudes allows for soil behavior examination in small strain range (0.001 -0.01%) which is typical for commonly encountered soil-structure interactions [10,11].…”

“…For simplification many models assume that some initial part of soil deformation path is purely elastic [5][6][7][8][9]. As most of the soil-structure interactions are within the small strain range (0.001 -0.01%) [10,11] this simplification is very useful and it can even be a satisfactory approximation for simple and typical engineering problems. However, research shows that even the initial deformation part in soil can be more complex than that [12][13][14][15] and the soil response to stress in small strain range is not yet properly described.…”

Steady state harmonic response of nonlinear soil-structure interaction problems through the Preisach formalism

“…( 1) in conjunction with Eqs. (31) and (32) requires the storage of the dominant maxima and dominant minima at each step, which is difficult to combine with built-in subroutines.…”

“…[4], [7], [8], and [31]), therefore suggesting the more general Preisach model can be also tailored for SSI studies. It has to be emphasized, due its versatility, the Preisach model of hysteresis is calibrated to match perfectly both stiffness and damping curves determined by experimental tests and/or available in literature, such those proposed in [19] and in [23].…”

Soil foundation and structure interaction effects on the estimating of fundamental period of instrumented buildings

“…Seismic analysis of a structure considering the soil properties is different from that considering embedded at its base [2]. Therefore, it is particularly important to consider the Soil Foundation Structure Interaction SFSI effects in seismic areas where soil dynamic response can affect the response of structures subjected to seismic excitation Davidovici [3] and AFPS [4], Pitilakis [5], Piro [6], Smith [7], Abdel Raheem [8], Fares [9], Mihailo [10], Todorovska [11] and Haitem [12]. An increase of 78% was observed by Jayalakshmi [13] and of 70% according to Kraus [14].…”