Abstract
It is critical to ensure the seismic resilience of super-tall buildings using high performance materials. The seismic resilience of these buildings can be enhanced by simultaneously controlling the maximum and residual inter-story drift ratios. To realize such dual-objective control, a prevailing trend is to adopt self-centering energy dissipation outriggers. In this study, taking a real engineering practice as the prototype building, super-tall building study cases with energy dissipation outriggers, and with self-centering energy dissipation outriggers are designed. Based on nonlinear time-history analysis, the seismic performances of these study cases are evaluated and compared with emphasis on the maximum, and residual inter-story drift ratios. The dual-objective control effect of self-centering energy dissipation outriggers and energy dissipation outriggers are analyzed and compared. The results indicate that self-centering energy dissipation outriggers are more effective than energy dissipation outriggers for achieving the dual-objective control of the maximum and residual drift ratios of super-tall buildings.
Highlights
Super-tall buildings are important parts of most cities, and their seismic performance and postearthquake recoverability are critical factors affecting the seismic resilient performance of cities
The results indicated that compared with the structure without SC-buckling restrained brace (BRB), the maximum inter-story drift ratio (MIDR) and maximum residual inter-story drift ratio (MRIDR) were reduced by 15 and 70% for this with SC-BRBs, respectively
To achieve dual-objective control of the maximum and residual deformations of super-tall buildings, SC-BRB is adopted for the web members to replace the BRB in the prototype building, and which results in the self-centering energy dissipation outrigger
Summary
Super-tall buildings are important parts of most cities, and their seismic performance and postearthquake recoverability are critical factors affecting the seismic resilient performance of cities. It is critical to realize dual-objective control of the maximum deformation during an earthquake and the post-earthquake residual deformation of the structure to improve the seismic resilient performance of super-tall buildings. The energy dissipation capacity of the outrigger can be effectively enhanced using the BRB as a web member Because such energy dissipation capacity is realized based on the yielding and significant plastic deformation of steel, considerable residual deformation of the BRB is typically observed after unloading. Such features may result in significant residual deformations of the outrigger and overall structure, thereby hindering the post-earthquake recovery of super-tall buildings (Kiggins and Uang, 2006; Lu and Lu, 2019). The feasibility of the SC-BRB for self-centering energy dissipation outriggers was validated
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