#vibrationproperties

This project is to understand and have the ability to perform dynamic test. Furthermore in this project, the author can investigate how the dynamics of a multistory building is modified by base isolation. The dynamic properties are also very important for the dynamics analysis of the structure. The main task in this project is to determine the dynamic behavior of a 5 storey steel structure model with base isolation system and without base isolation system by experimentally and numerically. In this section the author examine the vibration properties, natural modes and the earthquake response of two systems 1 Five storey building on a fixed base, 2 Same five storey building supported on the isolation system. In this whole project, the following tasks have to do. First the five storey structure has to model in SAP2000 numerically. After that by the definition of reference sensor positions, sensor setups and excitation locations, the first experimental modal test has planned to do. Then the data assessments have to do like model identification, comparison of test results with the numerical model and also simulate the tests numerically. Again it needs to modify the structure in the numerical model and analyzed it again. In the second test, the system has to prepare with base isolation system. There also have to do second data assessments like model identification, comparison of test results with the numerical model with respect to base isolation system and braced system. Since the dynamic behavior of a linearly behaving structure can be described by its modal parameters natural frequencies, mode shapes, modal damping it is important to carry out tests to identify these parameters. From a numerical analysis study, how response of the building with proposed isolation system under multi direction excitation is then presented followed by the conclusion.