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Seismic Behavior Research of SRC Frame Special⁃shaped Columns with viscous damper

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International Journal of Plant Engineering and Management 2024年第4期29卷 193-212页

作者： ZANG Baijie JIN Xiangying LI Xiang XIE Peng Hainan State Farms Jiangong Construction Group Co. Ltd.Haikou 570206China College of Marine Science and Engineering Hainan UniversityHaikou 570228China College of Civil Engineering and Architecture Hainan UniversityHaikou 570228China

Based on the non⁃linear finite element analysis software ETABS,a 3⁃spans of 1/2.5⁃scale of two⁃bay and three⁃story frame composed of steel reinforced concrete(SRC)special⁃shaped columns with energy dissipation devices,and time⁃history analysis were employed to research the seismic response of the *** results show that the seismic performance of SRC frame special⁃shaped columns with fluid viscous dampers was superior to those structures without the devices;most of the energy of the structure imposed by earthquake was dissipated by the viscous *** means of analysis result,the damping parameters of the viscous dampers are optimized;the results show that the vibration damping effect of viscous dampers was sensitive to the spectral characteristics of seismic *** results can serve for the structure design,retrofitted design and parameter analysis of the SRC frame with special⁃shaped columns with viscous dampers.

关键词： steel reinforced concrete(SRC) viscous damper seismic performance

Efficiency of the motion amplification device with viscous dampers and its application in high-rise buildings

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Earthquake Engineering and Engineering Vibration 2009年第4期8卷 521-536页

作者： Henry C.Huang WSP Asia Ltd.

After nearly a decade of application and investigation, a motion amplification device with viscous dampers for energy dissipation has been recognized as an effective solution to mitigate wind or seismic excitation, especially for stiff structural systems. As a result of compensation of amplified motion, it has been proved that the efficiency of viscous damper largely depends on the motion amplification device configuration, particularly for device stiflhess. In this paper, a ＂scissor-jack＂ type of motion amplification device, called a ＂toggle brace damper＂ system, is studied. It is demonstrated that the efficiency of such a device reflected by its amplification factor is not merely a function of its geometric configuration, but is highly dependent on the support elements＇ stiffness as well, similar to the mechanism of a leverage arm. Accordingly, a mathematical model in terms of complex modulus of the viscous damper with consideration of the support brace＇s stiffness is established. The results indicate that the efficiency of the motion amplification device with viscous dampers significantly depends on the stiffness of the support elements. Other parameters, such as toggle brace configuration and damping values of the viscous damper, are studied and compared. As an application example, numerical analyses are conducted to study the dynamic performance of a 39-story office tower installed with toggle brace dampers constructed on soft soil in a reclaimed area, under a combined effect of the vortex shedding of an adjacent existing 52-story building and earthquakes. The results show that viscous dampers with a motion amplification system using a properly designed toggle brace device proved to be an effective solution to alleviate the external excitations.

关键词： motion amplification device vibration mitigation viscous damper energy dissipation toggle brace damper

Suppression of multiple modal resonances of a cantilever beam by an impact damper

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Applied Mathematics and Mechanics(English Edition) 2020年第3期41卷 383-400页

作者： Xiaofeng GENG Hu DING Kexiang WEI Liqun CHEN Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy EngineeringSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China Department of Mechanical Engineering Hunan Institute of EngineeringXiangtan 411104Hunan ProvinceChina

Impact dampers are usually used to suppress single mode resonance. The goal of this paper is to clarify the difference when the impact damper suppresses the resonances of different modes. A cantilever beam equipped with the impact damper is modeled. The elastic contact of the ball and the cantilever beam is described by using the Hertz contact model. The viscous damper between the ball and the cantilever beam is modeled to consume the vibrational energy of the cantilever beam. A piecewise ordinary differential-partial differential equation of the cantilever beam is established, including equations with and without the impact damper. The vibration responses of the cantilever beam with and without the impact damper are numerically calculated. The effects of the impact absorber parameters on the vibration reduction are examined. The results show that multiple resonance peaks of the cantilever beam can be effectively suppressed by the impact damper. Specifically, all resonance amplitudes can be reduced by a larger weight ball. Moreover, the impacting gap is very effective in suppressing the vibration of the cantilever beam. More importantly, there is an optimal impacting gap for each resonance mode of the cantilever beam, but the optimal gap for each mode is different.

关键词： impact damper cantilever beam impacting gap multiple modes viscous damper

Seismic fragility analysis of three-tower cable-stayed bridges with different connection configurations

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Earthquake Engineering and Engineering Vibration 2024年第4期23卷 1009-1027页

作者： Chen Chen Liu Jinlong Lin Junqi Li Suchao Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationHarbin 150080China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementHarbin 150080China Key Laboratory of Structural Dynamic Behavior and Control Ministry of EducationHarbin Institute of TechnologyHarbin 150090China

Seismic fragility analysis of three-tower cable-stayed bridges with three different structural systems,including rigid system(RS),floating system(FS),and passive energy dissipation system(PEDS),is conducted to study the effects of connection configurations on seismic responses and *** element models of bridges are established using OpenSees.A new ground motion screening method based on the statistical characteristic of the predominant period is proposed to avoid irregular behavior in the selection process of ground motions,and incremental dynamic analysis(IDA)is performed to develop components and systems fragility *** effects of damper failure on calculated results for PEDS are examined in terms of seismic response and fragility *** results show that the bridge tower is the most affected component by different structural *** RS,the fragility of the middle tower is significantly higher than other components,and the bridge failure starts from the middle tower,exhibiting a characteristic of local *** FS and PEDS,the fragility of the edge tower is higher than the middle *** system fragility of RS is higher than FS and *** the failure of dampers into account is necessary to obtain reliable seismic capacity of cable-stayed bridges.

关键词： seismic fragility cable-stayed bridge connection configuration viscous damper comparison analysis

Full-scale dynamic testing of response-controlled buildings and their components:concepts,methods,and findings

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Earthquake Engineering and Engineering Vibration 2014年第S1期13卷 167-181页

作者： Kazuhiko Kasai Kazuhiro Matsuda Structural Engineering Research Center Tokyo Institute of Technology Director and Professor Assistant Professor

A series of shake-table tests was conducted by inserting and replacing 4 different types of dampers,or by removing them in a full-scale 5-story steel frame building. The objective is to validate response-control technologies that are increasingly adopted for major Japanese buildings without being attested to-date by a major earthquake. Test results are briefly described,and good performance of the dampers and frame demonstrated. The concepts of the full-scale building tests and various contributions are discussed. The difficulty associated with full-scale dynamic testing is explained.

关键词： response-controlled building steel frame steel damper viscous damper oil damper viscoelastic damper

Substructure design optimization and nonlinear responses control analysis of the mega-sub controlled structural system (MSCSS) under earthquake action

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Earthquake Engineering and Engineering Vibration 2021年第3期20卷 687-704页

作者： Mustapha Abdulhadi Zhang Xun′an Buqiao Fan Muhammad Moman College of Mechanics and Civil Engineering Northwestern Polytechnic UniversityXi’an 710071China

The newly proposed mega sub-controlled structure system(MSCSS)and related studies have drawn the attention of civil engineers for practice in improving the performance and enhancing the structural effectiveness of mega frame ***,there is still a need for improvement to its basic structural *** this project,an advanced,reasonable arrangement of mega sub-controlled structure models,composed of three mega stories with different numbers and arrangements of substructures,are designed to investigate the control performance of the models and obtain the optimal model configuration(model with minimum acceleration and displacement responses)under strong earthquake *** addition,the dynamic parameters that affect the performance effectiveness of the optimal model of MSCSS are studied and *** area of the relative stiffness ratio RD,with different mass ratio MR,within which the acceleration and displacement of the optimal model of MSCSS reaches its optimum(minimum)value is considered as an optimum *** serves as a useful tool in practical engineering *** study demonstrates that the proposed MSCSS configuration can efficiently control the displacement and acceleration of high rise *** addition,some analytical guidelines are provided for selecting the control parameters of the structure.

关键词： mega sub-controlled structure system(MSCSS) optimal model viscous damper dynamic parameters control effectiveness response control rubber bearing

Ideal Drift Response Curve for Robust Optimal damper Design for Elastic-Plastic MDOF Structures under Multi-Level Earthquakes Dedicated to Professor Karl *** for his 95th birthday

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Computer Modeling in Engineering & Sciences 2021年第12期129卷 1181-1207页

作者： Hiroki Akehashi Izuru Takewaki Department of Architecture and Architectural Engineering Graduate School of EngineeringKyoto UniversityKyotodaigaku-KatsuraNishikyoKyoto615-8540Japan

A new method of robust damper design is presented for elastic-plastic multi-degree-of-freedom(MDOF)building structures under multi-level ground motions(GMs).This method realizes a design that is effective for various levels of *** robustness of a design is measured by an incremental dynamic analysis(IDA)curve and an ideal drift response curve(IDRC).The IDRC is a plot of the optimized maximum deformation under a constraint on the total damper quantity *** design level of the *** total damper quantity corresponds to the total cost of the added ***,a problem of generation of IDRCs is ***,its solution algorithm,which consists of the sensitivity-based algorithm(SBA)and a local search method,is *** the application of the SBA,the passive added dampers are removed sequentially under the specified-level *** the other hand,the proposed local search method can search the optimal solutions for a constant total damper quantity under GMs’increased *** this way,combining these two algorithms enables the comprehensive search of the optimal solutions for various conditions of the status of the GMs and the total damper *** influence of selecting the type of added dampers(oil,hysteretic,and so on)and the selection of the input GMs on the IDRCs are ***,a robust optimal design problem is formulated,and a simple local search-based algorithm is proposed.A simple index using the IDRC and the IDA curve of the model is used as the objective *** is demonstrated that the proposed algorithm works well in spite of its simplicity.

关键词： Optimal damper placement robust damper design multi-level earthquake ideal drift response curve elastic-plastic MDOF model viscous damper hysteretic damper

Rapid report of seismic damage to buildings in the 2022 M 6.8 Luding earthquake,China

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Earthquake Research Advances 2023年第1期3卷 11-30页

作者： Zhe Qu Baijie Zhu Yuteng Cao Haoran Fu Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationNo.1 Chaobai StreetYanjiaoSanheHebei065201China Key Laboratory of Earthquake Disaster Mitigation Ministry of Emergency ManagementChina

The report summarizes the observed damage to a variety of buildings near the epicenter of the M6.8 Luding earthquake in Sichuan Province,*** include base-isolated buildings,multi-story reinforced concrete(RC)frame buildings,and masonry *** near-field region is known to be tectonically highly active,and the local intensity level is the highest,that is,0.4g peak ground acceleration(PGA)for the design basis earthquake,in the Chinese zonation of seismic ground motion *** extent of damage ranged from the weak-story collapse that claimed lives to the extensive nonstructural damage that suspended *** report highlights the first observation of the destruction of rubber bearings and viscous dampers in the isolation layer of Chinese seismically isolated *** also features the rare observation of the brittle shear failure of RC columns in moment-resisting frames in a region of such a high seismic design *** reasons that may have attributed to the reported damage are suggested by providing facts observed in the ***,careful forensic analyses are needed before any conclusive judgment can be made.

关键词： Base isolation Rubber bearing viscous damper Reinforced concrete frame Masonry structure Weak-story collapse Near-fault area Terrace riser Nonstructural element

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A SIMPLE RELOCATION STRATEGY FOR OPTIMAL PLACEMENT OF damperS OF BUILDING STRUCTURES

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A SIMPLE RELOCATION STRATEGY FOR OPTIMAL PLACEMENT OF DAMPER...