Abstract
According to the 2800 standard, the Iranian code of practice for seismic-resistant design of buildings, the base level refers to the level at which it is assumed that the horizontal movement of the ground is transmitted to the structure. In cases that there are reinforced concrete walls being run by an integrative structure in the underground perimeter, and the surrounding ground is dense and compressed, the base level is considered on the top of the basement wall. In tall structures, due to strong forces and moments at the foot of the structure, examining the location of base level and its movement becomes specially important. The aim of this study was to investigate the impact of changing the properties of the soil around the underground perimeter walls on the base level, taking into account the effects of soil-structure interaction systems. In this regard, the soil-structure system was investigated in two-dimensional models and the location of the base level was identified using shear and drift changes. The results indicated that taking into account the level of the upper stories is possible through performing appropriate walls integrated with the structure even without Compacting the soil around the structure.
Highlights
The progress and evolution of dynamics of structure on the one hand and information from recorded earthquakes, on the other hand, have shown that several factors are effective in determining the force of the earthquake
The results show that changing soil properties and loosening the soil (Table 1) have no effect on the place of the base level
To understand why this happens, all the basement walls buried inside the frame were removed and the soil around the building was placed in Table 1 as the weakest soil
Summary
The progress and evolution of dynamics of structure on the one hand and information from recorded earthquakes, on the other hand, have shown that several factors are effective in determining the force of the earthquake. The main aims of their research were as follow: First, considering the prevailing uncertainties in order to study the inelastic response of the structure and SSI, second, evaluating the practicing SSI provisions of the current seismic design codes on the structural performance. They found that SSI increases the ductility demand of structures (built on the flexible soil in reality) designed based on the conventional fixed‐ based assumption. Their general closed-form solution considers contributions due to model type, uncertainty in estimates of nominal values for correlated and uncorrelated load, and
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