Effect of soil stiffness on seismic response of reinforced concrete buildings with shear walls

Abstract

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.

Evaluation of Seismic Performance and Soil‐Structure Interaction (SSI) for Piloti‐Type Buildings considering Korean Geotechnical Conditions

“…Furthermore, it is very efficient that the responses of the soil and the foundation can be easily obtained by putting only the free-field ground motion as the effective seismic force into the assigned interface elements [16]. e validity of the analysis with LS-DYNA has been verified through several studies and literature up to date [17][18][19]. e range of a 3D FE model for an underlying soil should be divided into a finite boundary area (near-field) adjacent to the foundation of a structure and an unbounded and infinite area (far-field).…”

“…e range of a 3D FE model for an underlying soil should be divided into a finite boundary area (near-field) adjacent to the foundation of a structure and an unbounded and infinite area (far-field). Since the stress waves are inevitably reflected at the artificial interface that is introduced to separate the ground into two regions [18], the following aspects must be taken into account when modeling the underlying soil ground for effective seismic SSI analysis [17]. (1) e size of soil elements and the dimension of the domain should prevent the waves reflected from the structure due to the inertial interaction from propagating back into the ground, and (2) stress equilibrium must be established at the lateral boundary of the ground elements to effectively simulate infinite ground area.…”

Soil Structure Interaction Effects on Seismic Performance of Multi-Story RC Buildings with and without Shear Wall

“…Jayalekshmi and H.K. Chinmayi (2016) [5] on Effects of soil stiffness on seismic response of reinforced concrete buildings with shear walls. In this paper the multi-storey buildings up to 16 storey are considered to determine the effect of soil-structure interaction.…”

Performance of Building with Basements Under Seismic Excitation Considering Soil Structure Interaction

“…For the buildings having multiple basements, effect of both the interaction needs to be considered to obtain the real behavior of the structure. Many researchers ( [1], [2], [3] ) carried out the study on the buildings resting on ground while the effect of dynamic soil structure interaction for buildings with multiple basements are only studied for some hypothetical structures ( [1], [4], [5] ). The behavior of hypothetical structure can be significantly different from that of real-life structures resting on layered soil.…”