الفهرس | Only 14 pages are availabe for public view |
Abstract The study of multi-storey buildings composed of a combination of some concrete floors and some steel floors is a complex process especially when studied under the effect of the earthquakes. In this thesis, the seismic behaviors of hybrid structures which have statical systems of reinforced concrete frames for the lower floors and steel frames for the upper floors were studied. Nowadays, Steel-Concrete hybrid constructions are very popular; due to their advantages over conventional concrete and steel constructions. Concrete structures are bulky and impart more seismic weight and deflection whereas Steel structures exhibit less deflections and more ductility, which is beneficial in resisting earthquake forces. Hybrid Construction combines the good qualities of both steel and concrete along with a less cost, speedy construction, fire protection etc. The main idea of this thesis was to prepare a structural model to investigate tall building using one of the most renowned structural analysis program (ETABS). Comparative study of seismic performance of 30 storey structures under seismic conditions to zone 2A with UBC 1997, and with different numbers of concrete and steel stories were designed to resist an earthquake. All frames were designed under the same gravity loads, and the same boundary conditions. Equivalent Static Method, Response Spectrum Method, and load Time History Analysis method; all were used for conducting seismic analysis. The main working loads namely dead load and seismic load were defined according to (UBC 1997). The model created to investigate different parameters as the seismic behavior, base shear, storey displacement, storey drift and overturning moment. from the comparative study, it was concluded that the Steel buildings are the most efficient type of buildings in terms of seismic behavior. |