Observation and numerical analysis of soil‐structure interaction of a reinforced concrete tower

Abstract

SUMMARYA vast amount of earthquake response records of an observation tower are used together with microtremor data to investigate various aspects of the dynamic behaviour of the soil-structure system. It is found that separation of the soil from the structure occurs under large dynamic loads, leading to changes in the predominant frequency of the system. As a result of the decreasing of the soil support at the side walls of the foundation, the stress caused by the structural weight on the bottom soil increases during earthquakes. With regard to its practical applicability, a linear sway-rocking model is applied for numerical modelling of the soil-structure system. Alterations in the soil support as a result of soil non-linearity and separation of the structure from the soil are investigated by comparing recorded and simulated structural response. The influence of each of these factors on the softening of the soil support is distinctly assessed. An empirical relationship between the peak ground velocity and the soil constants for earthquake excitations of different magnitude is presented.

Soil-Structure Interaction of a Containment Model in Hualien, Taiwan

“…The decrease of the soil stiffness is consistent with the results, obtained from analysis of a rigid tower on a soft soil site in Chiba, Japan [3]. In the case of soft soil, however, separation of soil from structure was detected and proven to be a more influential factor than nonlinearity.…”

“…A comparison with a similar study carried out by the present authors on a soft soil site in Japan [3] is offered. Figure 4 shows transfer functions between the free field and the top of the structure, evaluated from observation data.…”

“…The values of these parameters were determined on the basis of the Continuum Formulation method [9] and the results of FVT-2, which represent a small-strain linear behavior, were successfully simulated. To account for the weakening of the soil support during each of the analyzed earthquakes, the soil coefficients were adjusted to fit the recorded response by the trial and error procedure, developed by Ganev et al [3]. Good agreement between actual behavior and simulation was achieved in all cases.…”

“…The behavior of the soil-structure system was simulated using a linear sway-rocking model, according to the methodology described in [3]. The model represents the soil support by means of a rocking spring coefficient KR, sway spring coefficient KH' rocking dashpot coefficient CR and sway dashpot coefficient CH'.…”

<title>Recent development in structural control including soil-structure interaction effect</title>

“…In practice, many of these structures (foundations) either rest on the ground surface or are embedded in flexible soil masses. The interaction between the structures and the soil masses through their interface at the foundations can be very strong when the soil masses become pretty soft [6][7][8][9][10] On the one hand, strong interaction considerably modifies the dynamic characteristics of structures such as frequencies, damping, and mode shapes. On the other, SSI adopts the seismic input at the foundations.…”