Static and dynamic analysis of multustory building including P- analysis

Multistory structures are subjected to different type and form of lateral loadings through its service life. Earthquake, wind and blast loadings are the potential lateral loadings for structures. Lateral displacements caused by these types of loadings necessitate consideration of P-? effects, especially for multistory high rise buildings. In this study main attention is focused on the investigation of effects of outrigger frame, end channel,exterior frame tube and exterior diagonal bracing tube systems on the P-? behavior of multistory high rise buildings. Staad Pro commercial program which is convenient for this type of investigation is used to simulate P-? behavior of multistory structures. 13 to 50 numbers of stories are considered for the investigation. The results suggest that P-?affects increases as the number of stories increase. Healing effects of shear walls on P-? behavior are also captured through the runs. In following stage, different types of bracings are introduced into models to observe the P-? behaviors. In the last stage multistory structures are subjected to different types of dynamic loadings. Freevibration, response spectrum and time history analyses are undertaken to investigate P- ? behavior of multistory high rise buildings under dynamic loading. Drawbacks obtained in present study generate knowledge and underline critical details to develop safe multi story building designs.Key Words: Multi story building, P-? effects, outriggers, structural systems, static and dynamic analysis