Behaviour of Buried Rectangular Structures During Earthquake

Abstract

In recent years, due to the increasing population, underground construction has started as well as superstructures. In addition to underground tunnels used for transportation, the design of rectangular structures such as subway stations, ventilation structures etc. is very common. Today, the calculation of loads on such embedded structures during earthquakes is calculated in a similar to retaining walls and this leads to uneconomical solutions. Within the scope of this paper, the displacement of embedded rectangular cross-section structures during earthquakes has been defined and the behavior of these types of structures under cyclic loading has been tried to be determined. In this study, one-dimensional soil response and two-dimensional finite element analyzes were performed using various structure- earthquake- soil combinations and in embedded structures, the horizontal displacements that occurred after an earthquake have been evaluated. At this stage, the important parameters are considered to be the soil–structure stiffness ratio, the stiffness of the soil, and the properties of the structure. Two-dimensional finite element based numerical analyzes were performed. For different states of structural stiffness, soil stiffness, and earthquake magnitudes, the relative displacements between the top and bottom of the structure were determined. Finally, the analysis used finite element method was performed using the easily obtainable soil-structure-earthquake parameters (depth, length, width of the structure etc.; soil stiffness; internal friction angle etc.) and results obtained from analysis were compared.