Buildings are subjected to lateral loads caused by wind, blasting and earthquakes. The high stresses developed by these loads literally tear the building components apart, which are in general designed for gravity loads. To resist these lateral forces, shear walls can be introduced in buildings. Present study aims to determine the apt shear wall position which attracts the least earthquake forces in symmetric plan multi-storey buildings. Dynamic response of a structure is significantly influenced by the underlying soil due to its natural ability to deform. 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. 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. From the study, it is found that structural response as per conventional fixed base condition is very conservative. For buildings founded on soil with V s B 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.
In metropolitan cities, due to high land value structures are built very close to each other. During strong earthquakes, adjacent buildings with insufficient clear distances collide with each other causing architectural and structural damage or collapse of the whole structure. In addition to pounding, the interaction effects exchange the vibration energy between buildings making the problem further complicated. This paper attempts to provide a stateof-the-art review on the pounding of structures considering soil-structure interaction effects.
Conventional analyses of structures are generally carried out by assuming the base of structures to be fixed. However, the soil below foundation alters the earthquake loading and varies the lateral forces acting on structure. Therefore, it is unrealistic to analyse the structure by considering it to be fixed at base. Multistorey reinforced concrete framed buildings of different heights with and without shear wall supported on raft foundation incorporating the effect of soil flexibility are considered in present study to investigate the differences in spectral acceleration coefficient(Sa/g), base shear, and storey shear obtained following the seismic provisions of Indian standard code and European code. Study shows that the value of base shear obtained for symmetric plan building is lowest in buildings with shear wall at all the four corners.
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