Analysis the effects of soil-structure interaction on the seismic behaviours of a 5-stories reinforced concrete building with basements

Abstract

The paper presents analysis results of structural behaviour with and without soil-structure interaction on a five-story reinforced concrete building with basements due to seismic loads. Two numbers of basements were considered namely the building with one basement floor (M1 model) and two basement floors (M2 model). Each of the M1 and M2 model has three variations with and without the soil structure interaction namely the model with the fixed supports (MJ1 and MJ2 models), the model with solid element of the soil (MSo1 and MSo2 models), and the model with lateral soil support of spring elements (MSp1 and MSp2 models). The Soil parameters of modulus elasticity, poisons ratio, reaction modulus and spring stiffness for the MSo and MSp models were obtained from soil investigation. All six models having loads combination of gravity and earthquake loads were analysed using a finite element software package program. All loadings and design codes follow Indonesian codes. Earthquake loads were evaluated using two methods namely equivalent static loads and spectrum response analysis. The results show that the roof-floor displacements of the soil-structure interaction model (MSo and MSp) are greater 2% to 3% than to that of the non-soil-structure interaction models (MJ). The roof drift and natural fundamental period of the MSo and MSp models is greater 1% to 2% than that of the MJ model. The axial force of the columns in the MSo and MSp models is less 1% to 3% than the MJ model. The addition of basement floors to the building and modelling with soil structure interactions can minimize the roof floor displacement, the natural fundamental period of the structure, and axial force of the column by 1% to 2%.

Numerical Study of the Seismic Response of an Instrumented Building with Underground Stories

“…Numerous studies have been conducted in the past decades to understand and analyze the seismic performance of structures with subterranean levels [13][14][15][16][17][18][19][20][21]. In the study done by El Ganainy and El Naggar [17], the seismic performance of moment-resisting frame steel buildings with multiple underground stories and varying building heights was evaluated through a 3D nonlinear finite element model (FEM) by considering the seismic hazard of Vancouver, Canada, and the use of BNWF model to simulate the essential aspects of the nonlinear behavior of the foundation and side soil.…”

“…The results showed that underground structure cracking should be included in the building's structural analyses and that foundation movement should be explicitly considered for soil class D and softer. Recently, Sudarsana et al [21] showed that basement floors' addition could minimize the roof-floor displacement, the structure's natural fundamental period, and axial column forces when considering SSI effects. Moreover, the effects of SSI on the dynamic response of other types of structures have also been assessed.…”

“…Moreover, comparisons of the effect of underground floors on the building's response to real-world data have been seldom reported, given the few instances where instrumentation was already placed in a building when significant or useful events were registered for data processing. While studies, such as [26,30] have investigated SSI effects through system identification techniques of buildings from earthquake data, only a few studies [16,17,21] to the best of the authors' knowledge, have focused on the influence of underground levels in the seismic analysis of buildings and only the former oriented to practical engineering applications. Naeim et al [16] analyzed the impact of foundation modeling on the accuracy of the simulated response of a high-rise building.…”