| Abstrakt: |
Global human population growth amounts to around eighty-three million per year. Space constraints for the construction of structures were reported by several countries worldwide. Hence, it is not possible to plan the symmetrical structure due to space constrain and topography of the land. In today's world where the increasing desire to stand out is prevailing, structures with various types of asymmetries are gaining popularity. Along with the architectural changes, human beings are not shying away from disturbing natural stability, which can easily be observed by the increased number of natural calamities. Frequent earthquakes are the prime example. Asymmetrical structures tend to have asymmetric distribution of strength and stiffness, which will lead to complex lateral and torsional movements during earthquakes. The effects of flexibility of structure and foundation system against the earthquake forces are considered in the traditional designs of structures. Natural period, lateral displacement etc. of a structure is influenced by various factors such as the flexibility of the structure, flexibility of the foundation system, depth and type of subsurface strata, magnitude of earthquake etc. The overall lateral stiffness of a structure is directly related to the soil on which it is standing. The structures constructed on the relatively soft soils will lead to decrease the lateral stiffness of the structure which ultimately results in the increased natural time period of the structural system. However, the natural time period of the structures is calculated without considering the inclusion of soil structure interaction, which gives the incorrect result of earthquake forces for design. The structure may be collapsed due to faulty design at the critical load cases which demands a diligent consideration on the soil structure interaction problem. Present study is a limited effort to establish the effect of asymmetry, flexibility of structure, flexibility of foundation system, type and depth of soil strata on the seismic behavior of a structure. The effects of these parameter were investigated through the numerical analysis of the structures after incorporating these parameters in the analysis. [ABSTRACT FROM AUTHOR] |
