Effects of friction pendulum bearing wear on seismic performance of long-span continuous girder bridge

Li, Chong; Zhang, Pengfei; Li, Yue; Zhang, Jingyue

doi:10.21595/jve.2022.22915

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…Earthquake disasters often cause serious casualties and economic losses, and can cause secondary disasters such as sand liquefaction, collapse, landslide, debris flow, avalanche and tsunami [10][11][12]. The earthquake will cause serious casualties, the key reason is that the occurrence of the earthquake will cause serious housing damage [13][14][15]. In order to reduce the damage caused by the earthquake and make the building structure resist the possible earthquake within the service life, the earthquake resistance ability of the structure should be enhanced as much as possible.…”

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An Efficient Algorithm for Multi-dimensional and Multi-point Random Seismic Response Analysis of Spatial Grid Structure based on Computer

2023

IJMC

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At present, the power spectrum method in the field of random vibration analysis, that is, to calculate the power spectrum of various responses from the given excitation power spectrum, has developed into a mature method. However, this method has not been widely used in engineering design in the past. The purpose of this paper is to study the efficient algorithm of multi-dimensional and multi-point random seismic response analysis of spatial grid structure. Firstly, the paper introduces the quick assessment of earthquake personnel loss from the aspects of the factors affecting the magnitude of earthquake disaster and the assessment process of earthquake personnel loss. Then, it further discusses the theoretical formula of multi-dimensional virtual excitation method, further extends the "virtual excitation method" to the multi-dimensional multi-point non-stationary random earthquake response analysis of spatial grid structure, gives the peak response estimation method, and discusses the multi-dimensional ground, the random model of vibration and the selection of parameters, the random seismic response of latticed shell structure is analyzed by special computer program. The experimental results show that the non-stationary random seismic response of the latticed shell is slightly smaller than that of the stationary random seismic response, with a ratio of about 0.9. The laws of the steady and non-stationary random vibration response of the latticed shell members are similar. IntroductionWith the continuous development of the times, the continuous improvement of social, economic International Journal of Multimedia Computing 70 and cultural level, and the progress of science and technology, how to effectively use the existing data and data, and apply new methods to improve the ability of the government and the earthquake department to respond quickly to emergencies and resist risks, and provide convenient and quick emergency rescue and related information for the masses is particularly important [1][2][3]. Earthquake disaster pre assessment software is a software system that integrates multiple disciplines, such as computer, geographic information system, global positioning system, monitoring system, earthquake disaster pre assessment system, statistical system, etc., integrates multiple data through network, communication and other channels, and provides earthquake emergency services and earthquake disaster pre assessment [4][5][6]. The earthquake disaster pre assessment software can effectively simulate the geological disaster, building collapse, lifeline engineering damage, casualties, economic loss and other disasters after the earthquake. According to the simulated disaster data, the pre disaster preparation work can be done, so that the disaster prevention and mitigation can be implemented, and provide more effective technical support for the post disaster leadership and organization of earthquake relief work [7][8][9]. Earthquake is a kind of emergency. Earthquake disaster often has the characteristics of stron...

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confidence: 99%

An Efficient Algorithm for Multi-dimensional and Multi-point Random Seismic Response Analysis of Spatial Grid Structure based on Computer

2023

IJMC

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Study on Mechanical Performance Evolution Law of the Friction Pendulum Bearing Under the Influence of Friction Characteristics of Sliding Interface

Dong,

Chen,

et al. 2024

Lecture Notes in Civil Engineering

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At present, it is difficult to acquire the internal state of sliding friction bearing, so the assessment indexes and quantitative evaluation standard for service state of friction pendulum bearing (FPB) is lack. In order to propose the relationship between service state and mechanical performance, the key components of FPB affecting the seismic response is as the research subject. The 3D solid refinement finite element numerical model of FPB is established, and its rationality of and simulated results reliability is verified by experimental results. Combined the mechanical performance theory calculation models of FPB and friction characteristics of sliding interface, the simulated results of mechanical performance including effective stiffness, total energy consumption, effective period, effective damping ratio of FPB under the influence of sensitive parameters is analyzed. The results show that the compressive stress is the most sensitive factor. With the increase of compressive stress, the equivalent stiffness increases exponentially, but the equivalent period increases and the equivalent damping ratio decreases, which obviously deteriorates the seismic performance of the seismic isolation bridge. When the compressive stress is constant, the cumulative sliding distance and sliding velocity can obviously affect the mechanical performance of the bearing, but the variation range of the equivalent damping ratio is less than 10%. In addition, when the friction characteristics of the upper and lower sliding interfaces of the FPB are not consistent, the condition of the lower sliding interface has a significant impact on the mechanical properties of the FPB. The research results provide data and method support for further quantitative evaluation of the seismic performance for the serviced FPB and seismic isolation bridges.

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Sensitivity factor analysis of seismic performance of seismically isolated girder bridges during the operation period

Chen,

Dong,

Wang

2023

AIP Advances

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The seismic performance of isolated girder bridges is accurately investigated and addressed by considering the theoretical foundation of seismic isolation, taking into account the operational period’s service state and changes in relevant performance indicators of vulnerable components. The analysis encompasses a comprehensive parameter analysis of seismic performance during the operational period, utilizing finite element analysis software, which involves comparing and analyzing structural deflections, deformation performance, and damage performance of seismically isolated girder bridges under varying parameters. The research findings indicate that, in terms of evaluating the damage state of the member, the displacement of the girder end of the main girder is primarily influenced by the interface friction coefficient of the isolation device, followed by the post-yield stiffness of the bearing. Conversely, abutment lateral stiffness has a relatively minor influence. Moreover, it is observed that the mechanical properties of the bearing (friction coefficient and post-yield stiffness) exert a significant impact on the structural seismic response. Therefore, more attention should be paid to the functional condition and the variation of mechanical performance parameters of the seismic isolation bearing during the operational phase.

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Effects of friction pendulum bearing wear on seismic performance of long-span continuous girder bridge

Cited by 3 publications

References 15 publications

An Efficient Algorithm for Multi-dimensional and Multi-point Random Seismic Response Analysis of Spatial Grid Structure based on Computer

An Efficient Algorithm for Multi-dimensional and Multi-point Random Seismic Response Analysis of Spatial Grid Structure based on Computer

Study on Mechanical Performance Evolution Law of the Friction Pendulum Bearing Under the Influence of Friction Characteristics of Sliding Interface

Sensitivity factor analysis of seismic performance of seismically isolated girder bridges during the operation period

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