Shaking table test of a damped‐outrigger system incorporating friction dampers

Lin, Po-Chuan; Chen, Ming‐Ching; Chung, Meng‐Lin

doi:10.1002/eqe.3831

Cited by 5 publications

(5 citation statements)

References 25 publications

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“…For other section properties of the transition zone, the equivalent weak-axis shear area, 𝐴 𝑣,𝑦𝑦,𝑇𝑍 , and moment of inertia, 𝐼 𝑦𝑦,𝑇𝑍 , can be obtained by respectively integrating the weak-axis shear area, 𝐴 𝑣,𝑦𝑦 , and moment of inertia, 𝐼 𝑦𝑦 , of the section over the transition zone and then dividing by ℎ 𝑇𝑍 , as in Equations ( 30) and (31). Assuming that the weak-axis shear area of the IC section, 𝐴 𝑣,𝑦𝑦,𝐼𝐶 , is estimated to be 5/6 of the flange area, as it is for the 50 WSPDs in Table 1, the ratio of 𝐴 𝑣,𝑦𝑦,𝑇𝑍 to 𝐴 𝑣,𝑦𝑦,𝐼𝐶 ranges from 1.03 to 1.10, with an average of 1.05.…”

Section: Elastic Stiffness Of Wspdsmentioning

confidence: 99%

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Experimental and analytical investigation of WT‐shapes stiffened steel panel dampers

Chen,

Tsai

2023

Earthq Engng Struct Dyn

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The three‐segment steel panel damper (TSPD) is a type of shear panel damper (SPD) used for dissipating seismic energy. TSPDs consist of an inelastic core (IC) and two outer elastic joints (EJs), with the IC having a weaker shear strength than the EJs. Buckling restraining stiffeners delay shear buckling, and end stiffeners stabilize the IC to facilitate force transfer. However, the fabrication of TSPDs may be costly due to the use of built‐up shapes. This prompted the investigation of a more cost‐effective option, namely the WT‐shapes stiffened steel panel damper (WSPD). The WSPD can be built from a single hot rolled wide flange steel shape with four WT‐shapes cut from it. A practical procedure for seismic design using this method is developed in this study. The design procedure for IC web stiffeners is also considered. We propose elastic stiffness calculation methods for WSPDs, which match the analytical results of the proposed model using commercial software. Two full‐scale 2.6 m tall WSPD specimens were fabricated and tested. Different target IC buckling shear deformations of 0.08 and 0.12 radians resulted in two different stiffener designs for specimen WSPD‐0L2T and WSPD‐1L2T, respectively. The specimens had excellent energy dissipation performance. WSPD‐0L2T IC web buckled later than predicted, while WSPD‐1L2T IC web buckled slightly earlier than expected. The elastic lateral stiffness and maximum shear strength computed from the proposed procedures agree with the experimental results within 5%. The experimental responses of the two specimens can also be accurately simulated using Abaqus finite element model analysis.

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Section: Elastic Stiffness Of Wspdsmentioning

confidence: 99%

“…The upper cross beam of the MATS has a 5 m vertical clearance from the platen. Lin et al 31 have provided further information about the MATS in their studies.…”

Section: Wspd Experimentsmentioning

confidence: 99%

Experimental and analytical investigation of WT‐shapes stiffened steel panel dampers

Chen,

Tsai

2023

Earthq Engng Struct Dyn

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“…Among various energy‐consuming devices, viscous dampers have received more attention because they are more effective in dissipating energy‐y. Moreover, the efficiency of the damped outriggers is greatly affected by their location in the structure 10,11 . The mechanical modeling and dynamic equations of core structures with damped outriggers have also received some attention 12 .…”

Section: Introduction (Skyscrapers)mentioning

confidence: 99%

“…Moreover, the efficiency of the damped outriggers is greatly affected by their location in the structure. 10,11 The mechanical modeling and dynamic equations of core structures with damped outriggers have also received some attention. 12 The problem of sudden changes in structural stiffness has also been alleviated.…”

mentioning

confidence: 99%

Application of amplified damped outrigger in seismic design of high‐rise buildings

Xue,

Zhao,

et al. 2024

Structural Design Tall Build

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SummaryThe application of the outrigger technology effectively improves the lateral stiffness of buildings, reduces harmful deformation, enhances the seismic resistance of structures, and contributes to the rapid development of high‐rise buildings. To improve the response speed and energy dissipation of a viscous damping outrigger under seismic excitation, a viscous damping outrigger with an amplifier was proposed, and its effectiveness was verified by combining it with the seismic design of a 149.2 m high‐rise building in an 8.5‐degree intensity area. To determine the additional damping ratio of the building structure, investigations were carried out using both the code method and energy ratio method to evaluate the contribution of the damping outrigger. The damped outrigger equivalent stiffness determination method was studied, and the simplified engineering calculation method was compared against the refined finite element analysis results for engineering design purposes. The displacement amplification technique incorporated into the viscously damped outrigger can enhance the damper response speed, and increase the energy dissipation of the damped outrigger system. The application of an enlarged damped outrigger in engineering can result in an additional damping ratio of approximately 1% while simplifying the calculation method based on the additional damping and equivalent damper cut‐line stiffness, which can be useful in engineering design.

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“…As normally the boundary conditions of the experimental substructures were loaded by actuators, it means the number of actuators should be greater than or equal to the number of specimen DOFs. [13][14][15] To completely realize the specimen DOFs, some laboratories built six-DOF loading facilities, such as the Load and Boundary Condition Box (LBCB) at UIUC, 16,17 the Multi-Axial Testing System (MATS) at NCREE, 18 the Multi-Axial Subassemblage Testing System (MAST) at the University of Minnesota, 19 and so forth. However, not all the laboratories are capable of build large-scale six-DOF loading facilities, or have sufficient actuators for large-scale specimen.…”

Section: Introductionmentioning

confidence: 99%

Hybrid simulation method with restoring force correction for structural testing characterized by incomplete boundary conditions

Wang

Yang

Wang

et al. 2022

Earthquake Engineering and Resilience

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Hybrid simulation is a powerful testing method that combines numerical analysis and physical experiments through on-line interaction. The substructuring technology enables hybrid simulation to evaluate the structural performance with large-scale specimens. However, this technology also increases the complexity of specimen boundary conditions. Due to limited equipment resources of structural laboratories, not all the degrees of freedom of the boundary conditions can be realized during tests, which will induce error to the experimental restoring forces and decrease of accuracy of hybrid simulation. In this case, the hybrid simulation method based on restoring force correction was proposed to reduce this error. In this method, the error in experimental restoring forces were corrected using an auxiliary numerical model of the experimental substructure. The effectiveness of the proposed method was verified through both theoretical analysis and numerical examples. This method was then adopted to evaluate the seismic performance of a spatial reinforced concrete frame with buckling-restrained braces numerically. Results showed that the proposed method can enhance the accuracy of tests compared to conventional hybrid simulation, and keep computational efficiency in the meanwhile.

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Shaking table test of a damped‐outrigger system incorporating friction dampers

Cited by 5 publications

References 25 publications

Experimental and analytical investigation of WT‐shapes stiffened steel panel dampers

Experimental and analytical investigation of WT‐shapes stiffened steel panel dampers

Application of amplified damped outrigger in seismic design of high‐rise buildings

Hybrid simulation method with restoring force correction for structural testing characterized by incomplete boundary conditions

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