A general solution for performance evaluation of a tall building with multiple damped and undamped outriggers

Fang, Chuangjie; Tan, Ping; Chang, Chia‐Ming; Zhou, Fu Lin

doi:10.1002/tal.1212

Cited by 24 publications

(31 citation statements)

References 16 publications

(15 reference statements)

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“…This trend is generally seen for all buildings with a di erent number of stories. This observation is compatible with the results of the study carried out by Fang et al [15] for the maximum modal damping ratio of structures equipped with two damped outriggers.…”

Section: Base Shear Forcesupporting

confidence: 93%

“…As observed earlier, the case of two damped outriggers for the 40-story structure leads to lower base shear force than the case of the single damped outrigger. This nding was con rmed by Fang et al [15].…”

Section: Optimum Number Of Outriggerssupporting

confidence: 74%

“…A general solution for the performance evaluation of tall buildings with multiple damped and conventional outriggers was presented. As for the results of a tall building with multiple damped or undamped outriggers, the proposed method was capable of providing an optimally parametric design with respect to the position of outriggers, damping, and core-to-column and core-to-outrigger sti ness ratios [15]. Huang and Takeuchi obtained an analytical solution for the dynamic response evaluation of a single-damped-outrigger system and determined the optimal outrigger locations and damper sizes to minimize the response.…”

Section: Introductionmentioning

confidence: 99%

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Effect of damped outriggers arrangement on the seismic response of high-rise steel structures

Asadi-Ghoozhdi

Mofid

2018

Scientia Iranica

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Recently, a novel structural system, which is de ned as a damped outrigger system, has been proposed to control the dynamic vibration of tall buildings. This paper examines the seismic performance of tall buildings involving multiple outriggers equipped with viscous dampers. In this respect, a dual structural system (braced moment frame) is selected as a bare structure. In addition, the number and position of outriggers are assumed to be variable along the structure height. Nonlinear Response History Analysis (RHA) is performed to evaluate the e ciency of the damped-outrigger system under eight-scaled ground motions. The results are presented based on the average of all ground motions. The mean inter-story drift ratio and maximum base shear force are compared in order to determine the best arrangement of damped outriggers. Conclusively, based on minimizing base shear force, the optimal location of damped outriggers under dynamic excitation is generally the same as that made for conventional outriggers. According to the inter-story drift ratio parameter, it is recommended to place one of the outriggers at the roof level.

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Section: Base Shear Forcesupporting

confidence: 93%

Section: Optimum Number Of Outriggerssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

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Effect of damped outriggers arrangement on the seismic response of high-rise steel structures

Asadi-Ghoozhdi

Mofid

2018

Scientia Iranica

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“…Numerical and experimental studies have been conducted to extend these damper‐based control capabilities towards an improved reduction of the dynamic response, including seismic scenarios . However, few studies explore the performance of damped outriggers under strong earthquake motion.…”

Section: Introductionmentioning

confidence: 99%

Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers

Morales‐Beltran

Turan

Yıldırım

et al. 2018

Structural Design Tall Build

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The seismic design of optimal damped outrigger structures relies on the assumption that most of the input energy will be absorbed by the dampers, whilst the rest of the structure remains elastic. When subjected to strong earthquakes, nevertheless, the building structure may exhibit plastic hinges before the dampers begin to work. In order to determine to which extent the use of viscously damped outriggers would avoid damage, both the host structure's hysteretic behaviour and the dampers' performance need to be evaluated in parallel. This article provides a parametric study on the factors that influence the distribution of seismic energy in tall buildings equipped with damped outriggers: First, the influence of outrigger's location, damping coefficients, and rigidity ratios core-to-outrigger and core-to-column in the seismic performance of a 60-story building with conventional and with damped outriggers is studied. In parallel, nonlinear behaviour of the outrigger with and without viscous dampers is examined under small, moderate, strong, and severe long-period earthquakes to assess the hysteretic energy distribution through the core and outriggers. The results show that, as the ground motion becomes stronger, viscous dampers effectively reduce the potential of damage in the structure if compared to conventional outriggers. However, the use of dampers cannot entirely prevent damage under critical excitations. KEYWORDSdamped outrigger, energy distribution, hysteretic energy, strong earthquakes, tall buildings, viscous damper 1 | INTRODUCTION Outrigger systems consist of a series of cantilever truss beams or shear walls connecting the building core with the perimeter columns. As a result, the axial forces acting at the end of the outriggers help the reduction of the total deflection of tall buildings by increasing the restoring moment.Dampers have been introduced between the perimeter columns and the outriggers, resulting in an increase in the overall damping of the building, instead of an increase of static stiffness and strength. [1] A well-known first implementation of this system in twins' 60-story buildings is reported in Willford and Smith. [2] Park et al. [3] reported the installation of damped outriggers in a 68-story tower in South Korea. In a recent review, [4] Smith reported two more applications of damped outriggers in tall buildings. All the authors point out that the addition of supplementary damping systems not only reduced the overall vibration response, but also construction costs.Numerical and experimental studies have been conducted to extend these damper-based control capabilities towards an improved reduction of the dynamic response, [3,[5][6][7] including seismic scenarios. [8][9][10][11][12][13][14][15][16][17] However, few studies explore the performance of damped outriggers under strong earthquake motion. Generally, studies are based on the use of peak ground acceleration (PGA) values up to 0.4 g, whereas strong earthquakes may exhibit PGAs of about 1.0 g. At the same time, most of the resea...

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“…An opposing concentrated moment is generated in the core upon applying lateral loads as shown in Figures and . Recent research has been carried out on the seismic response of outrigger‐braced buildings (e.g., other studies).…”

Section: Introductionmentioning

confidence: 99%

Analysis of outrigger‐braced reinforced concrete supertall buildings: Core‐supported and tube‐in‐tube lateral systems

Kafina¹,

Sagaseta

2018

Structural Design Tall Build

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This study is primarily focused on the approximate analysis of reinforced concrete outriggers which are commonly used in the design and construction of supertall buildings subject to distributed horizontal loads. Existing global analysis formulae that provide preliminary results for lateral deflections and moments are reviewed for two lateral load resisting systems, namely, core-supported-with-outrigger (CSOR) system and less frequent tube-in-tube-with-outrigger (TTOR) system. These formulae are only applicable for CSOR and neglect the reverse rotation of the outrigger actually suffered due to the propping action from the outer columns and give rather high predictions of the deflections compared with advanced numerical finite element (FE) models. An improved model is proposed which overcomes this issue and provides more consistent results to FE predictions. The same can also be extended to TTOR.Several case studies are investigated to verify the accuracy of the proposed methodologies. The global analysis is followed by the local analysis of reinforced concrete outrigger beams using strut-and-tie modelling and non-linear FE analysis to obtain optimized reinforcement layouts (reduction of quantities of reinforcement). The results highlight the different challenges in detailing such structural members which are heavily loaded (high congestion of reinforcement), and the behaviour at failure can be brittle.

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A general solution for performance evaluation of a tall building with multiple damped and undamped outriggers

Cited by 24 publications

References 16 publications

Effect of damped outriggers arrangement on the seismic response of high-rise steel structures

Effect of damped outriggers arrangement on the seismic response of high-rise steel structures

Distribution of strong earthquake input energy in tall buildings equipped with damped outriggers

Analysis of outrigger‐braced reinforced concrete supertall buildings: Core‐supported and tube‐in‐tube lateral systems

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