Abstract
The focus of this study is to investigate the seismic behavior of outrigger-braced building considering the soil–structure interaction based on finding the best location of outrigger and belt truss system. For this purpose, a central outrigger-braced frame of a steel tall building is considered. A layered soil deposit underlied this frame and the resulting soil–structure system is subjected to seismic excitation. To analyze this system, direct method is employed in OpenSees. Also, elastic and in-elastic analyses are both considered and a comparison is made between current results and the results related to the system with fixed base. The best location of outrigger–belt truss system is determined by considering the maximum roof displacement, base moment and base shear with and without soil–structure interaction. It is shown that considering SSI affects the location of outrigger–belt truss system. Elastic analysis of both systems, namely with fixed base and with soil–structure interaction, showed that locating the belt truss at higher stories caused lower amounts of roof displacement.
Highlights
In tall buildings, the most important criterion is lateral forces such as earthquake and wind which may have significant effects on design
The best location of belt truss is determined for four different cases: elastic structure supported on a fixed base (El FB), elastic soil–structure system (El soil–structure interaction (SSI)), in-elastic structure supported on a fixed-base (In-El FB), and in-elastic soil–structure system (In-El SSI)
SSI was investigated for tall buildings with the objective of finding best location of outrigger and belt truss system
Summary
The most important criterion is lateral forces such as earthquake and wind which may have significant effects on design. All of the structures have fixedbase conditions; whereas, in this study, the goal is to locate outrigger–belt truss system optimally in tall buildings, considering soil–structure interaction (SSI). Lu et al (2003) carried out a three-dimensional finiteelement analysis of a tall building by considering dynamic SSI In this analysis, the effects of different parameters like soil property, the rigidity of structure and buried depth on dynamic characteristics and seismic response were discussed. Tabatabaiefar et al (2013) evaluated the effects of dynamic SSI on seismic behavior and lateral structural response of mid-rise moment-resisting building frames using finite difference method (FDM). Finite-element method has been used to evaluate the effects of soil–structure interaction on dynamics response of different types of buildings constructed in Kerman.
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