检索结果-内蒙古大学图书馆

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2019年第11期20卷 823-837页

作者： Chen YAN Xi-mei ZHAI Yong-hui WANG Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

目的:研究冲击荷载各参数对于液化天然气(LNG)储罐的动力响应结果,定义LNG储罐受到冲击荷载时的破坏模式,并分析不同破坏模式下的破坏机理,为工程防御冲击荷载提供有效的理论研究基础。创新点:1.建立精细化的LNG储罐有限元模型;2.定义LN... 详细信息

目的:研究冲击荷载各参数对于液化天然气(LNG)储罐的动力响应结果,定义LNG储罐受到冲击荷载时的破坏模式,并分析不同破坏模式下的破坏机理,为工程防御冲击荷载提供有效的理论研究基础。创新点:1.建立精细化的LNG储罐有限元模型;2.定义LNG储罐在冲击荷载下的破坏模式并揭示其破坏机理;3.提出损伤因子Df可区分三种冲击破坏模式。方法:1.通过有限元模拟,进行冲击荷载的参数分析,得到不同冲击荷载对于LNG储罐的动力响应(图6和7);2.根据数值模拟结果,定义LNG储罐受到冲击荷载时的破坏模式(图8),并分析其破坏机理(图10和11);3.通过经验公式验算LNG储罐抵御冲击荷载的可靠性。结论:1. LNG储罐薄弱部位为外罐和环梁及底板的连接部位;2. LNG储罐受到冲击荷载的破坏模式分为局部变形、混凝土剥落和穿透三种;本研究得到了各种破坏模式下的破坏机理,并定义了损伤因子Df来区分三种破坏模式;3.通过经验公式验算,LNG储罐可以抵御英国规范建议的冲击荷载和法兰的冲击;DOE-standard公式计算结果最为保守。

关键词： LNG储罐冲击动力响应数值模拟破坏机理

来源：评论

学校读者我要写书评

暂无评论

Seismic behavior of FRP-retrofitted rectangular RC columns subjected to oblique horizontal earthquake actions

引用

Construction and Building Materials 2025年 482卷

作者： Zhu, Furui Zhang, Mengjie Zhang, Dawei Wang, Daiyu Wang, Zhenyu Zhang, Yaodong School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Department of Civil Construction and Environmental Engineering North Dakota State University Fargo58102 United States School of Civil Engineering Yantai University Yantai264005 China

Externally wrapped fiber-reinforced polymer (FRP) confinement has proven effective in improving the seismic performance of reinforced concrete (RC) columns. However, existing seismic design recommendations are primarily based on quasi-static cyclic test results applied along the principal axis of the column section, which cannot accurately reflect the true characteristics of earthquakes. In this study, two 1/2-scale FRP-retrofitted rectangular RC columns were subjected to shaking table tests with ground motion input directions at 30° and 60° to the strong axis of the cross-section, respectively. The seismic performance, including damage mode, natural frequency, acceleration, displacement and strain response, torsional effect, and energy dissipation, was thoroughly analyzed. The result found that FRP-retrofitted rectangular RC columns exhibited completely different damage modes under shaking table tests compared to quasi-static loading, from previous ductile flexural failure to unfavorable flexural-shear-torsional failure, with more and wider cracks, more significant deformation, and more severe damages. These findings suggest that conclusions drawn from quasi-static tests tend to overestimate the retrofitting effect of FRP, and retrofitting only the plastic hinge zone of RC columns is insufficient to ensure structural safety, which should be considered in future seismic strengthening design criteria for RC structures. © 2025

关键词： Earthquake effects

来源：评论

学校读者我要写书评

暂无评论

Effects of pure carbonation on pore structure and water permeability of white cement mortars

引用

CEMENT 2022年 9卷

作者： Fangzhou Ren Xingyao Chen Qiang Zeng Chunsheng Zhou Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China College of Civil Engineering and Architecture Zhejiang University Hangzhou 310058 China

The effects of carbonation on cement-based materials have drawn much attention because of its profound influences on durability performance of concrete structures. Most accelerated carbonation in lab.is conducted at RH 50%–70%, which also dries out cement-based materials. The introduced drying action changes pore structure significantly, making the effects of carbonation obscure. To clarify the effects of pure carbonation, water permeability and related micro-structural characteristics are measured on mature mortars, which have been carbonated at water-saturated state. It is found that after carbonation, the porosity of mortars decreases slightly, with finer overall pore structure and lower characteristic pore size. The water permeability also decreases by roughly 40% on average. Based on the pore size distribution curves obtained through the low-field proton nuclear magnetic resonance technique, water permeability is predicted by the Katz-Thompson and Kozeny-Carman theories with satisfactory accuracy. The decrease of water permeability after carbonation agrees well with the reduced characteristic pore length, which quantitatively verifies the observed refinement of nanoscale pore structure due to pure carbonation.

关键词： Carbonation White cement mortar Pore structure Water permeability Low-field nuclear magnetic resonance (LF-NMR)

来源：评论

学校读者我要写书评

暂无评论

Experimental study on seismic behavior of interior steel fiber reinforced RPC beam-column joints

引用

Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第3期40卷 161-171页

作者： Wang, Dehong Zheng, Wenzhong Ju, Yanzhong Wei, Chunming Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering and Architecture Northeast Electric Power University Jilin132012 China

In order to investigate the seismic behavior and shear bearing capacity of steel fiber reinforced reactive powder concrete (RPC) beam-column joints, quasi-static tests on eight RPC interior beam-column joints were carried out. The variables considered in test program included strength of reinforcement, stirrup ratio in joint core, and web rebars and vertical rebars across the joint core, and their influences on the failure mode, shear bearing capacity, hysteretic loops, energy dissipation, strength degeneration and rigidity degeneration behavior of the RPC joints were analyzed. The tests results indicate that the HRB600 longitudinal rebars in the beam mitigate the rigidity degeneration and improve the energy dissipating capacity of the specimen. An increase in stirrup ratio improves the strength degeneration and energy dissipating capacity of the specimen during the failure stages. As the transverse reinforcement ratio in joint core increases from 0 to 0.98%, the shear bearing capacity and ductility of the RPC joint increase. Web rebars and vertical rebars across the joint core improve the shear bearing capacity, strength degeneration and energy dissipation capacity of the specimen. Using the formula of GB 50011-2010 to calculate the shear bearing capacity leads to conservative results for RPC joints with a low stirrup ratio, but tends to be unsafe when the area stirrup ratio is greater than 0.98%. The predictions given by ACI 352- 02 are closer to the test result compared to the GB 50011-2010 prediction, with a safety margin of 9%- 46%. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Steel fibers

来源：评论

学校读者我要写书评

暂无评论

Experimental and numerical study of the strengthening effects of externally bonded CFRP on defected of pipes 7

Experimental and numerical study of the strengthening effect...

引用

7th Asia-Pacific Conference on FRP in structures, APFIS 2019

作者： Kong, Deao Xian, Guijun Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (纸本)9780648752899

Externally wrapped carbon fiber reinforced polymer (CFRP) composites have been considered to be effectively in strengthening or repairing steel pipes. In the present paper, an unidirectional carbon fiber fabric was used to strengthen steel defective pipes. The strengthening effectiveness of ISO/TS 24817 design methods and the effects of CFRP thickness on the burst pressure, failure mode and stress distribution of the repaired pipes were investigated through burst test and finite element analysis. Comparing with defected pipes, the burst pressure of the pipes enhanced by at least 100% strengthened with ISO/TS 24817 methods. The stress of CFRP decreases linearly from inner layer to outer. A simple finite element analysis method was developed to predict the burst pressure of unidirectional CFRP-wrapped defective steel pipes. © APFIS 2019. All right reserved.

关键词： Finite element method

来源：评论

学校读者我要写书评

暂无评论

Retraction notice to "Study on damage rules on concrete under corrosion of freeze-thaw and saline solution" [Constr. Build. Mater. 304 (2021) 124617] (Construction and Building Materials (2021) 304, (S0950061821023722), (10.1016/***.2021.124617))

引用

Construction and Building Materials 2025年 474卷

作者： Chen, Dingshi Deng, Yuang Shen, Jiyang Sun, Guorui Shi, Jun School of Civil Engineering Central South University Changsha410075 China National Engineering Laboratory for High Speed Railway Construction Changsha China Bridge Design Institute CCCC First Highway Consultants Co. Ltd. Shaanxi Xi'an710075 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Laboratory of Bridge Detection and Reinforcement Technology of Ministry of Transport Chang'an University Shaanxi Xi'an710064 China

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://***/locate/withdrawalpolicy). This article has been retracted at the request of authors with approval of the Editor-in-Chief. Following correspondence with the corresponding author requesting to retract this paper over an authorship dispute, it was determined that significant content in this paper is based on a 2019 Chang'an University Master's thesis "Study on Damage Rules of Concrete under Corrosion of Freeze-Thaw and Saline Solution" [https://***/KCMS/detail/***?dbname=CMFD202001&filename= ***] submitted by Su Youbiao and supervised by Dr. Hu Dalin. The specimens reported as "schemes 0 through 9" in this paper are taken directly from the Chang'an University Master's thesis. Results for schemes 0 through 9 are fully reported in the Chang'an University Master's thesis (Chapter 3). No indication or acknowledgement of the source of this data is provided. Neither Su Youbiao nor Hu Dalin is credited as a coauthor. The authors agree with the need to retract this paper in order to uphold and maintain the highest standards of academic integrity. © 2025 Elsevier Ltd

关键词：

来源：评论

学校读者我要写书评

暂无评论

NSFnets (Navier-Stokes Flow nets): Physics-informed neural networks for the incompressible navier-stokes equations

arXiv

引用

arXiv 2020年

作者： Jin, Xiaowei Cai, Shengze Li, Hui Karniadakisc, George Em Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China Division of Applied Mathematics Brown University ProvidenceRI02912 United States

We employ physics-informed neural networks (PINNs) to simulate the incompressible flows ranging from laminar to turbulent flows. We perform PINN simulations by considering two different formulations of the Navier-Stokes equations: the velocity-pressure (VP) formulation and the vorticity-velocity (VV) formulation. We refer to these specific PINNs for the Navier-Stokes flow nets as NSFnets. Analytical solutions and direct numerical simulation (DNS) databases provide proper initial and boundary conditions for the NSFnet simulations. The spatial and temporal coordinates are the inputs of the NSFnets, while the instantaneous velocity and pressure fields are the outputs for the VP-NSFnet, and the instantaneous velocity and vorticity fields are the outputs for the VV-NSFnet. These two different forms of the Navier-Stokes equations together with the initial and boundary conditions are embedded into the loss function of the PINNs. No data is provided for the pressure to the VP-NSFnet, which is a hidden state and is obtained via the incompressibility constraint without splitting the equations. We obtain good accuracy of the NSFnet simulation results upon convergence of the loss function, verifying that NSFnets can effectively simulate complex incompressible flows using either the VP or the VV formulations. For the laminar flow solutions we show that the VV formulation is more accurate than the VP formulation. For the turbulent channel flow we show that NSFnets can sustain turbulence at Reτ ∼ 1, 000 but due to expensive training we only consider part of the channel domain and enforce velocity boundary conditions on the boundaries provided by the DNS data base. We also perform a systematic study on the weights used in the loss function for the data/physics components and investigate a new way of computing the weights dynamically to accelerate training and enhance accuracy. Our results suggest that the accuracy of NSFnets, for both laminar and turbulent flows, can be improved wi

关键词： Turbulence

来源：评论

学校读者我要写书评

暂无评论

Research of snow distribution on lower roof of step roofs with gable-roof on high part

引用

Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 48-55页

作者： Liu, Boya Zhang, Qingwen Liu, Mengmeng Mo, Huamei Fan, Feng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Step roofs are sensitive to snow loads, therefore, snow distribution on lower roof of step roofs with gable-roof on the high part was studied through model experiment. The model experiments were conducted in open air snow-wind combined lab.ratory developed by the Harbin Institute of Technology, which could simulate the process of natural snowfall. The experiments consisted of four models according to different slopes of the upper gable-roof, and were conducted in different wind velocities and directions. The reliability of the experiment results was verified through comparison of field measurements and experiments on step flat roofs. The results show that the higher the wind velocity, the more significant the unevenness of snow distribution, but the roof snow distribution coefficient does not increase with the wind velocity. The slope of the upper gable-roof has significant influence on snow distribution. For the model which has 60°gable roofs and is under a wind of 3m/s from the windward side, the maximum snow distribution coefficient is 7.9 which is beyond the value in Eurocode. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Roofs

来源：评论

学校读者我要写书评

暂无评论

Anchorage and fatigue performance of a large-diameter carbon/glass hybrid rod 7

Anchorage and fatigue performance of a large-diameter carbon...

引用

7th Asia-Pacific Conference on FRP in structures, APFIS 2019

作者： Li, Chenggao Xian, Guijun Li, Hui Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (纸本)9780648752899

A novel pultruded large diameter glass fiber shell (GFS) and carbon fiber core (CFC) hybrid rod (19 mm) was developed for structural applications. In the present paper, the anchorage performance of hybrid rod was systematically studied and a novel extrusion-bonding compound anchor was proposed. The tension-tension fatigue tests were conducted with three stress levels (41.7%, 33.4% and 25.0%) and a fixed stress ratio of 0.4. It can be found the stress distribution of hybrid rod in the extrusionbonding anchor was uneven. The fatigue life of the hybrid rod conformed to the classic logarithm regression model. The fatigue damage of the hybrid FRP rod was initiated by debonding of GFS/CFC interface, leading more loads to be transferred to GFS. The fatigue failure mode was that GFS split and separate from CFC, while no obvious damage was found on CFC. © APFIS 2019. All right reserved.

关键词： Fatigue testing

来源：评论

学校读者我要写书评

暂无评论

Review of research methods in snow engineering for buildings

引用

Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 1-13页

作者： Fan, Feng Zhang, Borui Zhang, Qingwen Liu, Mengmeng Zhang, Guolong Mo, Huamei Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Snow engineering for buildings is a new academic discipline, which aims to investigate and forecast the influence of snowfalls on buildings and surroundings as well as the possibility of the disaster such as buildings collapse induced by snow accumulation, based on interdisciplinary researches such as physics, geophysics and catastrophology etc. This paper presents an in-depth review and analysis on the development of three main research methods, namely, field measurement, experimental research and numerical simulation. In terms of the field measurement, the development and theoretical models of several important factors, including snow transport by wind and snow melt by heat transfer, are investigated;the focus of this method in China in the future is also pointed out. Four different research techniques involved in experiments and the establishment of their similarity criterions as well as the selection of relevant parameters are summarized, followed by the necessity of establishing the professional climatic wind tunnel for snow drift research. By reviewing the progress of the computational fluid dynamics (CFD) simulation method, the achievement of existing simulation methods and their potential shortcomings are summarized so as to show the direction of the future improvements in this research method. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Snow

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：