This process is generally referred to as dynamic soil–structure interaction. The response of the soil regulates the motion of the structure and the response of the structure regulates the motion of the soil. Besides, dynamic response of the structure induces deformation of the supporting soil.
WEBWALL BENT STIFFNESS SEISMIC FREE
The motion of the base of the structure diverges from the free field motion, due to the incompetence of the foundation to adapt to the deformations of the free field. The same structure responds differently when supported on a soft soil. SSI problem has become a significant feature in structural engineering as it is inevitable to build important structures in locations with less favourable geotechnical conditions like seismically active regions.įor the structures founded on rock, the extreme high stiffness of the rock constrains the rock motion and the structural response is regarded to be same as that of a fixed base structure during ground motion. Hence the interaction between the structure and the soil need to be considered and modelled accurately in order to design earthquake resistant structures and to evaluate the seismic safety of the building. The conventional non-interaction analysis of buildings without considering the influence of the soil results in design which is either unnecessarily costly or unsafe. The process in which, the response of the soil influences the motion of the structure and vice versa, is referred to as SSI. The dynamic response of a structure depends on the properties of underlying soil, structure and nature of excitation. Soil–structure interaction (SSI) is an interdisciplinary field which involves structural and geotechnical engineering. For buildings founded on soil with V s ≤ 300 m/s, providing the shear walls at the core is advantageous whereas for soil with V s > 300 m/s, the shear walls placed at exterior corners of the building attracts the least earthquake force. From the study, it is found that structural response as per conventional fixed base condition is very conservative. Four different soil types based on shear wave velocity and six varying shear wall positions in multi-storey buildings up to 16 storeys are considered to determine the effect of soil–structure interaction. Three dimensional finite element soil–structure interaction analyses of reinforced concrete shear wall buildings with shear walls placed at various locations is carried out in time domain using scaled down Elcentro ground motion to determine the seismic response variation in the structure due to the effect of stiffness of soil. Dynamic response of a structure is significantly influenced by the underlying soil due to its natural ability to deform. Present study aims to determine the apt shear wall position which attracts the least earthquake forces in symmetric plan multi-storey buildings. To resist these lateral forces, shear walls can be introduced in buildings. The high stresses developed by these loads literally tear the building components apart, which are in general designed for gravity loads. Buildings are subjected to lateral loads caused by wind, blasting and earthquakes.
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