Seismic Performance of Steelconcrete Hybrid Structure for Highrise

: ﻋﻨﻮﺍﻥ ﻣﻘﺎﻟﻪ Seismic Performance of Steel-concrete Hybrid Structure for High-rise Buildings with Viscous Dampers : ﻧﺎﻡ ﺧﺎﻧﻮﺍﺩگی ﻣﻮﻟﻔیﻦ Soheila Kookalani, Mark Lindsey

1. Introduction 2. Fluid viscous dampers 3. Literature Review 4. Numerical example 4. 1. Maximum story displacement 4. 2. Story drift 4. 3. Story Shear force 5. Conclusion

1. Introduction This paper implemented nonlinear time-history analysis to show the efficiency of viscous dampers on the seismic performance of hybrid structures. Moreover, the earthquake responses of normal structures and structures with dampers were compared. The relationship between damping devices and displacement response, shear force response, and drift were explained.

2. Fluid viscous dampers Figure 1. Fluid viscous dampers (FVD)

3. Literature Review Constantinou and Symans (1993) proposed a simplified method for calculating the modal characteristics of structures enhanced with the aid of fluid damping devices. Di. Paola et al. (2007) used dynamic stochastic techniques to analyze the uncertainty of seismic input and its effects on the response of fluid damper-enhanced structures. Guneyisi and Altay (2008) subjected a typical high-rise workplace building positioned in a moderate seismic zone of Istanbul to a set of 240 artificially generated earthquake ground motions and then analyzed its seismic performance through nonlinear time history analysis. Lin et al. (2009) used shake table tests to study the seismic response of concrete buildings enhanced with fluid damping devices and reinforced concrete walls.

3. Literature Review Hejazi et al. (2011) developed a nonlinear computational scheme to model the whole nonlinear dynamic response of damped reinforced concrete framed buildings when experiencing seismic movement. Zhou et al. (2012) developed a method for fluid dampers in structural designs that could be standardized and widespread. Weng et al. (2012) proposed a simplified procedure for using viscous damping devices to retrofit frames damaged by earthquakes. Abdi et al. (2018) used equivalent statistical analysis to assess the effect of viscous dampers on the ductility, strength and response modification factors for structures based on different damping coefficients.

4. Numerical example Figure 2. Structural plane (mm) (a) (b) Figure 3. Arrangement of dampers: (a) elevation; (b) 3 D model

4. Numerical example 4. 1. Maximum story displacement Figure 5. Story lateral displacement Table 2. Displacement Comparison in y-direction Story 1 Story 2 Story 3 Story 4 Story 5 Story 6 Story 7 Story 8 Story 9 Story 10 Story 11 Story 12 Story 13 Story 14 Story 15 With Dampers Without Dampers 0. 005 0. 016 0. 03 0. 045 0. 06 0. 073 0. 086 0. 102 0. 117 0. 129 0. 139 0. 152 0. 172 0. 194 0. 217 0. 022 0. 056 0. 085 0. 107 0. 13 0. 158 0. 175 0. 196 0. 215 0. 241 0. 264 0. 278 0. 285

4. Numerical example 4. 2. Story drift Figure 6. Story drift Table 3. Story Drift Comparison-in Y direction Story 1 Story 2 Story 3 Story 4 Story 5 Story 6 Story 7 Story 8 Story 9 Story 10 Story 11 Story 12 Story 13 Story 14 Story 15 With Dampers Without Dampers 0. 005 0. 011 0. 014 0. 015 0. 017 0. 018 0. 021 0. 022 0. 023 0. 025 0. 026 0. 022 0. 034 0. 033 0. 032 0. 033 0. 029 0. 031 0. 03 0. 029 0. 025 0. 021 0. 02

4. Numerical example 4. 3. Story Shear force Figure 7. Story Shear force Table 4. Story Shear Force Comparison in y-direction Story 1 Story 2 Story 3 Story 4 Story 5 Story 6 Story 7 Story 8 Story 9 Story 10 Story 11 Story 12 Story 13 Story 14 Story 15 With Dampers Without Dampers 30. 657 51. 095 53. 593 53. 989 55. 299 52. 453 51. 554 61. 122 68. 203 70. 618 70. 368 70. 897 77. 238 74. 091 99. 690 333. 12 287. 04 213. 27 237. 73 233. 08 237. 24 266. 19 230. 73 183. 43 168. 12 170. 82 158. 11 172. 319 177. 22 162. 03

5. Conclusion Adding fluid viscous dampers to buildings can prove to have significant advantages. After analysis and evaluation of experimental results, it is clearly determined that if viscous dampers are used as a dissipative device, energy from earthquakes can be absorbed and dissipated in the form of heat. While energy is dissipated, the roof displacement, ground displacement, base shear, response spectrum, and inter-story drift all decrease considerably; thus, the overall structural damage is reduced. As structural damage is reduced, many lives and much property may be saved. The overall seismic performance of a building may be improved by using energydissipating devices (dampers), which absorb the input energy for the full duration of an earthquake. As shown by the above results, it is clear that the seismic response of a structure can be reduced significantly through the addition of viscous dampers.