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12th fib International PhD Symposium in Civil Engineering

作者： Abid, Muhammad Hou, Xiaomeng Zheng, Wenzhong Shi, Shuomang Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology 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

ISBN: (纸本)9788001064016

Reactive powder concrete (RPC) is an advanced generation of concrete having superior qualities than traditional types of concretes. However, fire may severely affect its quality and strength. In this paper mechanical properties of RPC containing polypropylene (PP) fibers were studied experimentally after exposure to high temperature. The quality of concrete was also assessed by non-destructive testing (NDTs) such as ultrasonic pulse velocity (UPV) method and resonance frequency (RF) method. dynamic elastic modulus has been determined by availab.e equation from NDTs measurements. The results show that an initial increase in strength was observed up to 300℃. However, a gradual decrease in strength occurred for temperature higher than 300℃. Constitutive relationships have been proposed for structural strength assessment through NDTs. © 2018 Czech Technical University in Prague. All rights reserved.

关键词： Nondestructive examination

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Study on the calculation method of ice load of icebreaker in straight line state 25

Study on the calculation method of ice load of icebreaker in...

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25th International Conference on Port and Ocean Engineering under Arctic Conditions, POAC 2019

作者： Li, Liang Wang, Wei Ma, Haichong Meng, Xiangbin Han, Guangchun 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

Ice action is the primary factor that affecting the navigation of icebreaker in the ice area. The ice-breaking load also directly impacts on the construction and design of the icebreaker. Therefore, reasonable calculation of ice-breaking load has become the most important issue at present. Focusing on ice cover, this paper presented a theoretical model for calculating the ice-breaking resistance of the icebreaker. The presented model is based on the combination of semi-infinite beam and infinite beam along and perpendicular to the moving direction of the icebreaker on elastic foundation, respectively. The influence factors such as buoyancy and ice failure criterion are considered in this model. Then, authors compared the theoretical calculation formula with the existing empirical formula and theoretical formula to verify the feasibility of the presented calculation model in this paper. This model can provide theoretical reference for the design and construction of polar region icebreakers. © 2019, Lulea University of Technology. All rights reserved.

关键词： Icebreakers

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Ultrasonic guided waves sensing using optical fiber sensor 7

Ultrasonic guided waves sensing using optical fiber sensor

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7th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2015

作者： Zhou, W. Li, H. Dong, Y. Wang, A. Key Lab. of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China National Key Laboratory of Science and Technology on Tunable Laser Harbin Institute of Technology Harbin150001 China

Optical fiber sensors have been proven that they have potential as ultrasonic guided waves sensor for structural health monitoring and damage detection. They can be used to receive acoustic emission signals from dynamic structural damages or guided waves propagating in waveguide and excited by ultrasonic actuators. Optical fiber sensors based on Mach-Zehnder interferometer were investigated in this work. Their sensing properties were explored experimentally using Lamb waves excited by a piezoelectric wafer in an aluminum plate. Spiral shape with different size was selected to increase their sensitivity. Experiments were also conducted to examine the voltage responses received by this type of sensor, and investigate results of tuning frequency. © 2015, International Society for Structural Health Monitoring of Intelligent Infrastructure, ISHMII. All rights reserved.

关键词： Structural health monitoring

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Revision of bolt connection design formulae for standard GB 50005-2017 and a comparison of the lateral resistance between national design codes

Revision of bolt connection design formulae for standard GB ...

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2018 World Conference on Timber Engineering, WCTE 2018

作者： Niu, Shuang Wang, Xiaoting Zhu, Enchun Key Lab. of Structures Dynamic Behaviour and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The current China national standard Code for design of timber structures GB50005-2003 has not been revised for over a decade, and features incapability and shortcomings for the current design practice. To facilitate the revision of the code, theoretical and experimental studies were carried out on lateral resistance of bolt connections. Formulae for the coefficient of effective dowel bearing length were derived employing European Yield Modes (EYM). Test results reveal the applicability of the formulae derived, and the fact that plasticity of the bolts is not fully developed. The resistance partial factors for design were derived so as to obtain equivalent reliability level with current design code. In terms of reliability level, a concise comparison was made between the proposed design formulae for Standard GB 50005-2017 and the European and American codes. © WCTE 2018 Committee.

关键词： Bolts

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大型液化天然气储罐在冲击荷载下的动力响应数值研究（英文）

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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

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Characteristics of aerodynamic force and flow structure behind single box girder under isolated slit control

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Journal of Central South University 2022年第8期29卷 2542-2557页

作者： CHEN Guan-bin CHENWen-li Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China

An isolated slit was placed in a single box girder to obtain passive leading-edge suction and trailing-edge jet flow to control the unsteady aerodynamic force and modify the flow *** Great Belt East Bridge was used as a physical model at a geometric scale of 1:*** tunnel experiments were conducted at an incoming airflow speed of 10 m/s,and the Reynolds number was calculated as 2.3×104 using the test model height and wind *** surface pressure distribution was measured,and the aerodynamic force acting on the test model with and without the isolated slit was calculated by integrating the pressure *** was found that the control using an isolated slit can dramatically decrease the fluctuating surface pressure distribution and aerodynamic *** analysis on the power spectral density of the lift force revealed that the isolated slit accelerated vortex ***,high-speed particle image velocimetry was used to investigate the wake flow structure behind the test model.A vortex separated from the upper surface was pushed to a lower location and the wake flow structure was modified by the isolated slit.A proper orthogonal decomposition(POD)of the flow field showed that the first two POD modes in the controlled case contributed less energy than those in the uncontrolled case,indicating that more energy was transferred to higher modes,and small-scale vortices had more energy.A secondary instability structure was found in the wake flow for a nondimensional jet momentum coefficient J of 0.0667.

关键词： single box girder isolated slit aerodynamic force proper orthogonal decomposition(POD)mode

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Strategic positioning of FRP anchors in frpstrengthened slab. 7

Strategic positioning of FRP anchors in frpstrengthened slab...

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7th International Conference on FRP Composites in Civil Engineering, CICE 2014

作者： Zhang, Huawen Smith, Scott T. Wang, Zhenyu Southern Cross University Australia Department of Engineering Southern Cross University Australia Key Lab of Structures Dynamic Behavior and Control Ministry of Education China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (纸本)9781771363082

A common problem associated with the strengthening of reinforced concrete (RC) structures with externally bonded fibre-reinforced polymer (FRP) composites is the ability of the FRP to prematurely debond. The installation of anchorage devices is an intuitive and logical means with which to enhance the debonding resistance of such strengthening systems, however, there are limited comprehensive experimental studies to date. Anchors may also enhance the ductility of the strengthened member although experimental studies are particularly limited that investigate this phenomenon. This paper reports the results of seven reinforced concrete (RC) slab.tests of which six slab. were strengthened in flexure with FRP plates. Five of the strengthened slab. were anchored with FRP anchors of different positioning and geometry. Depending on their position of installation, anchors are shown to enhance either the strength alone or both the strength and ductility of the FRP-strengthened slab..

关键词： Anchors

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Effect of glass fiber fabrics isolation layer on the adhesion bond behaviours between CFRP plates and steel substrates 12

Effect of glass fiber fabrics isolation layer on the adhesio...

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Joint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete structures, FRPRCS 2015 and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in structures, APFIS 2015

作者： He, Jun Xian, Guijun Li, Hui Key Lab. of Structural Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

Strengthening of steel structures with adhesively bonded carbon fiber-reinforced polymer (CFRP) plates has received extensive attentions in recent years. Since galvanic corrosion occurs between CFRP and the steel, glass fiber fabrics (GFF) are generally applied as an isolation layer. The present paper studied the effects of GFF on the bonding performances (such as ultimate strength and bond-slip relationship) between the CFRP and steel substrates. A series of pull-off tests were performed with variables of the thickness of the GFF layer. The testing results shows that the failure mode is the CFRP plate delamination failure, rather than cohesive failure. Based on this failure mode, the bondslip relationship curves is also trapezoidal shape for ductile adhesive and the thickness of the GFF isolation layer has no influence on the bonding performances. © APFIS 2015. All rights reserved.

关键词： Plates (structural components)

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Numerical simulation of separated and reattached flows around a backward-facing step

Numerical simulation of separated and reattached flows aroun...

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International Conference on Measuring Technology and Mechatronics Automation

作者： Yinsong Li Chaorong Zheng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

ISBN: (纸本)9781467371445

Separated and reattached flows around a backward-facing step (BFS) controlled by continuous suction was numerically investigated using the turbulence model of large eddy simulation (LES) based on the dynamic kinetic energy subgrid-scale model. The effect of suction control on the flow fields was described by the suction flow coefficient, and the results indicate that suction is not only very effective in shortening the reattachment length, but also very influential in reducing the turbulence fluctuations of the reattached flows. With increasing increments of the absolute suction flow coefficient, the effect of suction control is more significant. Furthermore, comparisons of the time-averaged statistics between the numerical simulation and corresponding experiment are conducted, and it shows that the LES can acquire exact results. Therefore, feasibility of the numerical methods to simulate suction-controlled models is validated.

关键词： Backward-facing step suction large eddy simulation flow control reattachment length

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Isolation research of friction pendulum bearings in K8 single-layer reticulated domes

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Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology 2015年第12期47卷 9-15页

作者： Kong, Dewen Fan, Feng Zhi, Xudong Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

To obtain the seismic performance of single-layer reticulated domes with friction pendulum bearings (FPB), finite element refined models of FPB were applied to 80 m K8 single-layer reticulated domes FE Model. The same earthquake waves were exerted to single-layer reticulated shells with hinge support or FPB. The isolation effect of FPBs was analyzed in two main aspects including the dynamic responses of bars and nodes of reticulated domes, and the impact of FPB parameters on the seismic response of single layer latticed shell were discussed. The results indicate that the optimal friction coefficient of FPB increases with the increase of the ground motion intensity. The bigger curvature radius of FPB, the smaller seismic responses of reticulated shell structure will be. On the basis of the above research, this paper gave some discussion how friction pendulum bearings were selected for single-layer reticulated domes. © 2015, Editorial Board of Journal of Harbin Institute of Technology. All right reserved.

关键词： Friction

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