检索结果-内蒙古大学图书馆

Risk-Targeted Design Spectra for Uniform Risk Seismic Design

Seismological Research Letters 2025年第3期96卷 1820-1833页

作者： Wang, Cong Lu, Da-Gang Key Laboratory of Building Structural Retrofitting and Underground Space Engineering Ministry of Education Shandong Jianzhu University Jinan China Key Laboratory of Structural Dynamic Behaviors and Control Ministry of Education Harbin Institute of Technology Harbin China

The uniform hazard response spectrum only considers the seismic hazard of a site, without taking into account the seismic fragility of the structure. As a result, structures designed based on this spectrum may exhibit varying levels of collapse risk under earthquakes in different regions. To this end, first, various cases are employed to determine a first-order approximation of the seismic hazard function H(x), followed by a validation of its rationality. Subsequently, with the objective of achieving uniform collapse risk, considering both seismic hazard and structural fragility, single anchor point, double anchor points, and multiple anchor points methods are proposed to construct the risk-targeted seismic design spectra for frequent earthquake (FE), design basis earthquake (DBE), maximum considered earthquake (MCE), and very rare earthquake (VRE). Furthermore, a comprehensive study is conducted to analyze the risk-targeted seismic design spectra corresponding to different seismic design levels, site classes, and characteristic periods constructed using the multiple anchor points method. In addition, a comparative analysis is conducted on the risk-targeted seismic design spectra constructed using different methods. The study indicates that determining H(x) based on DBE and VRE is reasonable, and the relative difference between the risk-targeted ground motion (RTGM) derived from this case and the RTGM obtained by determining H(x) based on probabilistic seismic hazard analysis is within 4%. The risk-targeted seismic design spectra constructed using three different methods show overall similarity. The single anchor point method offers simplicity in calculations and ensures that the uniform risk seismic design spectrum aligns with the uniform hazard seismic design spectrum in terms of spectral shape. Although the multiple anchor points method involves increased computational effort, it allows for the consideration of seismic hazard at multiple periods. © Seismological

关键词： Risk assessment

来源：评论

学校读者我要写书评

暂无评论

structural strength deterioration of coastal bridge piers considering non-uniform corrosion in marine environments

引用

Earthquake Engineering and Engineering Vibration 2018年第2期17卷 429-444页

作者： Guo Anxin Yuan Wenting Li Haitao Li Hui Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology

In the aggressive marine environment over a long-term service period,coastal bridges inevitably sustain corrosion-induced damage due to high sea salt and *** paper investigates the strength reduction of coastal bridges,especially focusing on the effects of non-uniform corrosion along the height of bridge ***,the corrosion initiation time and the degradation of reinforcement and concrete are analyzed for bridge piers in marine *** investigate the various damage modes of the concrete cover,a discretization method with fiber cells is used for calculating time-dependent interaction diagrams of cross-sections of the bridge piers at the atmospheric zone and the splash and tidal zone under a combination of axial force and bending ***,the shear strength of these aging structures is *** simulation indicates that the strength of a concrete pier experiences dramatic reduction from corrosion initiation to the spalling of the concrete *** loss in the splash and tidal zone is more significant than in the atmospheric zone when structures’service time is assumed to be the same.

关键词： Coastal bridge strength deterioration marine environment non-uniform corrosion interaction diagram

来源：评论

学校读者我要写书评

暂无评论

Effects of air relief openings on the mitigation of solitary wave forces on bridge decks

引用

Journal of Hydrodynamics 2019年第3期31卷 594-602页

作者： Sheng-chao Xiao An-xin Guo Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Department of Civil Engineering The University of Queensland Brisbane 4072 Australia

For inverted T-type bridge decks, the air entrapped in the chambers between adjacent girders could increase the wave forces and lead to the destruction of the bridge decks. This paper studies the effects of the air relief openings (ARO) on the mitigation of the solitary wave-induced forces on the bridge decks. Hydrodynamic experiments are conducted for three inverted T-type decks with four, five, and six girders with different wave properties and deck clearances. The open source computational fluid dynamics toolbox OpenFOAM is adopted to conduct numerical simulations for the effects of the AROs. Since the numerical results correlate well with the measurements, the mechanism of the wave-structure interaction can be revealed by the numerical flow fields. Furthermore, the relationship between the shape and the volume of the ARO and the wave forces on the bridge decks, as well as the contribution of each ARO to the effect of the wave force mitigation, is also obtained from the numerical results of the OpenFOAM. Experimental and numerical results demonstrate that the AROs could effectively reduce the vertical wave forces on the bridge decks. The effects of the AROs increase with the increase of the volume of the ARO, while the shape of the ARO has no effect on the reduction of the wave forces.

关键词： Air entrapped hydrodynamic experiment solitary wave forces bridge decks OpenFOAM

来源：评论

学校读者我要写书评

暂无评论

Experimental validation of a signal-based approach for structural earthquake damage detection using fractal dimension of time frequency feature

引用

Earthquake Engineering and Engineering Vibration 2014年第4期13卷 671-680页

作者： Tao Dongwang Mao Chenxi Zhang Dongyu Li Hui Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Center of Structural Monitoring and Control School of Civil Engineeing Harbin Institute of Technology

This article extends a signal-based approach formerly proposed by the authors, which utilizes the fractal dimension of time frequency feature （FDTFF） of displacements, for earthquake damage detection of moment resist frame （MRF）, and validates the approach with shaking table tests. The time frequency feature （TFF） of the relative displacement at measured story is defined as the real part of the coefficients of the analytical wavelet transform. The fractal dimension （FD） is to quantify the TFF within the fundamental frequency band using box counting method. It is verified that the FDTFFs at all stories of the linear MRF are identical with the help of static condensation method and modal superposition principle, while the FDTFFs at the stories with localized nonlinearities due to damage will be different from those at the stories without nonlinearities using the reverse-path methodology. By comparing the FDTFFs of displacements at measured stories in a structure, the damage-induced nonlinearity of the structure under strong ground motion can be detected and localized. Finally shaking table experiments on a 1：8 scale sixteen-story three-bay steel MRF with added frictional dampers, which generate local nonlinearities, are conducted to validate the approach.

关键词： earthquake damage detection time frequency feature fractal dimension signal-based shaking table test frictional damper

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

The visualization of turbulent coherent structure in open channel flow

引用

Journal of Hydrodynamics 2019年第2期31卷 266-273页

作者： Xiao-dong Bai Wei Zhang Qing-he Fang Yong Wang Jin-hai Zheng An-xin Guo Ministry of Education Key Laboratory of Coastal Disaster and Defence Hohai UniversityNanjing 210098China College of Harbor Coastal and Offshore EngineeringHohai UniversityNanjing 21009China Science and Technology on Water Jet Propulsion Laboratory Marine Design and Research Institute of ChinaShanghai 200011China Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil EngineeringHarbin Institute of TechnologyHarbin 150090China Max Planck Institute for Dynamics and Self-Organization GottingenGermany

Due to its multiscale and multi-layer natures,the coherent structures of turbulent in the open channel flow is complex and difficult to be visualized for understanding its *** this paper,five types of methods for the vortical structure in the fluids,namely the Q-criterion,the vorticity,the Omega method,the velocity-vorticity correlation structures(VVCS)as well as the most recent Rortex method,are adopted to visualize the turbulent flow in the open *** the free surface modelled as a free slip boundary,a direct numerical simulation(DNS)is carried out to study the multi-layered flow structure characteristics under the free *** visualization results by the Q-criterion,the vorticity,the Omega method and the Rortex are firstly *** the turbulent flow layers near the free surface are identified with corresponding anisotropy ***,the VVCS within various turbulence layers are visualized *** research indicates that the VVCS can straightforwardly show the geometry information of the cohere nt structures of turbulent in different layers for the ope n channel flow.

关键词： Open channel flow flow visualization velocity-vorticity coherent structure direct numerical simulation(DNS)

来源：评论

学校读者我要写书评

暂无评论

Investigation on mapping relationship between deflection and cable tension by artificial neural networks 11

Investigation on mapping relationship between deflection and...

引用

11th International Workshop on structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Tian, Yadi Li, Hui Key Laboratory of Intelligent Disaster Prevention and Mitigation for Civil Infrastructure Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605953304

Cables usually serve as critical load-bearing structural components in cable-stayed bridges. Vertical deflection is an important overall indicator that directly reflects the health status of bridge. The relationship between cable tension and vertical deflection also reflects the underlying mechanism of structures. In this context, a machine learning-based approach is proposed. Cable tension and vertical deflection are caused by prestress, temperature and vehicle loads. In this study, we focus on the cable force and vertical deflection caused by vehicle loads. Artificial neural network (ANN) is employed as the supervised learning method to learn the relationship between cable tension and vertical deflection. Field monitored data of Jintang Bridge are used to test the validity of the proposed method. The results show that ANN is capable of modelling vertical deflection from cable tension data in the case of arbitrary vehicle distribution. The proposed method which integrates the local and global variables by using two different kinds of monitoring data, avoids the complicated mechanical derivations, and is proved to be environment-insensitive.

关键词： Neural networks

来源：评论

学校读者我要写书评

暂无评论

Compressible effect on the cavitating flow:A numeric study

引用

Journal of Hydrodynamics 2017年第6期29卷 1089-1092页

作者：张伟柏晓东马峥陈刚 Yong Wang Science and Technology on Water Jet Propulsion Laboratory Marine Design and Research Institute of ChinaShanghai 200011China Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of CivilEngineeringHarbin Institute of TechnologyHarbin 150090China China Ship Scientific Research Center Wuxi 214082China Max Planck Institute for Dynamics and Self-Organization Am Faflberg 17Gottingen 3 7077Germany

To understand the effect of the compressibility on the cavitating flow, a compressible, multiphase, single component Reynolds averaged Navier-Stokes（RANS） solver is used to study the cavitating flow on a wedge in the present work. A barotropic equation of status is used. A non-linear model for compressibility in the mixture is adopted to capture the effect of the compressibility within the complex cavitation bubbly mixtures. An unsteady cavitation phenomenon is found in the numerical simulation. The numerical results of local compressibility and Mach number in the bubbly mixture are given. The mechanism responsible for the unsteady shedding of the bubbly mixture is discussed based on the numerical results.

关键词： Cavitation compressibility barotropic flow

来源：评论

学校读者我要写书评

暂无评论

Compressive sensing of images for automatic crack segmentation based on generative adversarial network 10

Compressive sensing of images for automatic crack segmentati...

引用

10th International Conference on structural Health Monitoring of Intelligent Infrastructure, SHMII 2021

作者： Zhang, Haoyu Huang, Yong Wu, Stephen Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Eng. Harbin Institute of Technology Heilongjiang Harbin150090 China Research Organization of Information and Systems The Institute of Statistical Mathematics 10-3 Midori-cho Tachikawa Tokyo190-8562 Japan

In a structural health monitoring (SHM) system that uses digital cameras to monitor cracks of structural surfaces, techniques for reliable and effective data compression are essential to ensure a stable and energy-efficient transmission of crack images in wireless sensing platforms such as drones and wall-climbing robots. Compressive sensing (CS) is a powerful signal processing technique, using the sparsity regularization. It allows accurate recovery of a signal from a sampling rate much smaller than the limitation of the Nyquist sampling theorem. Its hardware implementation allows down sampling of signals during the sensing process. Hence, CS methods can achieve significant energy saving for the wireless sensing devices. However, for the reconstruction of traditional CS methods, the strong assumption of the signals being highly sparse under certain bases is relatively hard to guarantee for many structural crack images. Generative adversarial network (GAN) has powerful capability to learn features of targeted images and is able to effectively capture low-dimensional representations of high-dimensional images. By exploiting the dimensionality reduction effect of GAN, we present a new approach of CS that replaces the sparsity regularization with a GAN model. Based on this new CS method, we developed a recovery framework of compressed crack images for automatic crack segmentation, in which crack images are reconstructed by directly optimizing the low dimension representation learned by GAN. In our experiments, taking advantage of the strong capability of GAN to capture the necessary features required for the crack segmentation task in compressed image data, we demonstrated the remarkable reconstruction precision, calculation speed and robustness toward noise of our recovery framework, even though the backgrounds of images are not well reconstructed. © 2021 International Conference on structural Health Monitoring of Intelligent Infrastructure: Transferring Research into

关键词： structural health monitoring

来源：评论

学校读者我要写书评

暂无评论

Pounding-induced stress wave analysis and mitigation of highway bridges under earthquakes 6

Pounding-induced stress wave analysis and mitigation of high...

引用

Joint 6th International Conference on Advances in Experimental structural Engineering, AESE 2015 and 11th International Workshop on Advanced Smart Materials and Smart Structures Technology, ANCRiSST 2015

作者： Li, Suchao Guo, Anxin Cui, Lili Mao, Chenxi Li, Hui Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Institute of Engineering Mechanics China Earthquake Administration Harbin150090 China

Seismic colliding between adjacent structures without enough distance may lead to considerable structural damage or even collapse during large earthquakes. Additionally, during the contact-separation process, pounding-induced waves not only increase internal damage of the structure but also have significant effect on the acceleration measurement. To investigate the propagation behavior of the colliding-induced stress wave and the pounding mitigation effects of shape memory alloy pseudo-rubber shock absorber devices (SMAPR-SADs) on adjacent superstructures, a series of shaking table tests on a 1:30 scaled steel highway bridge model are performed. Then, the effect of stress waves on the acceleration signals of bridge structures is firstly investigated. The characteristics of pounding stress waves are analyzed based on wave theory, the cross wavelet transform and wavelet coherence analysis. The amplitude and absolute energy of the stress waves are compared between the original structure and after the installation of SMAPR-SADs. Furthermore, the mitigation mechanism of SMAPR-SADs on pounding-induced stress waves is interpreted. Results show that SMAPR-SAD has stable energy absorption ability and could obviously reduce the amplitude and energy of the pounding stress waves, and also lower the corresponding effect on the accuracy of the measurement system. © International Conference on Advances in Experimental structural Engineering. All rights reserved.

关键词： Shock absorbers

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：