Recent advances in computing have brought a new and challenging way to tackle the earthquake hazard and disaster problems: integration of the seismic actions in the form of numerical models. For this purpose, integrated earthquake simulation (IES) has been developed in Japan, and now a new version is being developed in Turkey which targets Istanbul. This version of IES is being built in MATLAB and includes site response analysis and structural analysis of existing buildings with data obtained via GIS databases. In this study, we present an initial application in Zeytinburnu district of Istanbul where the results are expressed in the form of spatial distributions of ground motion and building responses. At the end of the analysis, it is seen that most of the buildings make small displacements and the displacement values are directly proportional to the total height of the structures. Since the obtained ground motion distribution and peak values are not very high, structural damage has not been observed under the current simulation. The effect of bedrock depth and soil parameters on strong ground motion distribution has been observed. The most effective ground motion locations in the selected area have been determined, and the critical buildings that have maximum displacement during the earthquake motion are detected. Currently, the IES on MATLAB does not include the source to bedrock wave propagation mechanism and the resulting ground motions at each grid point. In future studies, alternative models for this purpose along with input model parameters for Istanbul will be applied. Once the source-to-structure integrated model is complete, past earthquakes as well as potential scenario events in Istanbul will be modeled in the final form of IES on MATLAB. Results will be valuable for a variety of purposes ranging from disaster mitigation to emergency management. In future part of this study, site vibration tests will also be made for buildings that do not comply with seismic design codes and constitute the largest portion of the seismic risk. New models will be developed for these buildings and adopted into the IES system.
Abstract. Soil structure interaction (SSI) is an important topic when seismic performance of
In this study a simple code is developed in powerful programming software MATLAB. Graduate engineering students are generally expected to cope with Finite Element Method in two and three dimensions during their Finite Element Courses. However textbooks of that courses, sometimes, do not have enough solved examples for students, because in two and three dimensions calculations are difficult to do manually. At this step a computer program which includes infinite number of examples, as user defines them, and their solution steps, is of crucial importance. The produced MATLAB code has these features as it can display stiffness matrix with or without boundary conditions, deformed shape of the body, displacement, strain and stress distributions over the surface. This code also makes it possible to analyze bodies as it is a plane stress or plane strain body. Besides, this MATLAB code can generate a step by step solution report for students to comprehend the Finite Element procedure. Since this code is a simple and educational tool, only one-piece rectangular bodies can be analyzed. The body to be analyzed can be meshed into various number of rectangular elements. These rectangular elements utilize bilinear Lagrangian shape functions, and Gauss Quadrature technique is used to deal with integrations. In this study four Gauss integration points are used as two in X direction and two in Y direction, which yields the exact integration as approximation functions are bilinear.
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