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The 14th International Congress on the Chemistry of Cement（ICCC 2015）

作者： Hongzhi Zhang Xinchun Guan Jinping Ou Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology

Based on numerical micro-structure model of cement paste,a lattice diffusion model is generated to study the influence of randomness on the chloride diffusion coefficient of capillary pore *** results indicate that,compared with regular model,random model has longer diffusion distance,consequently,in order to get same simulation diffusion results,the former's diffusion coefficient should be adjusted a lttlte *** Lattice models have been used in fracture mechanics of cement-based materials for a long ***,the use of lattice models has been extended on simulating chloride transport processes in this *** of the transport models focus on simulation method and process,but the difference of simulated results caused by randomness is generally *** this paper,a lattice diffusion model is generated to study the influence of randomness on the chloride diffusion coefficient of capillary pore element,the reason that different simulation method has different results is also found.

关键词： durability micro-scale lattice model chloride diffusion

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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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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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Numerical simulations of shake-table experiment for dynamic soil-pile-structure interaction in liquefi able soils

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Earthquake Engineering and Engineering Vibration 2014年第1期13卷 171-180页

作者： Tang Liang Baydaa Hussain Maula Ling Xianzhang Su Lei Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology

A shake-table experiment on pile foundations in liquefi able soils composed of liquefi able sand and overlying soft clay is studied. A three-dimensional(3D) effective stress fi nite element(FE) analysis is employed to simulate the experiment. A recently developed multi-surface elasto-plastic constitutive model and a fully coupled dynamic inelastic FE formulation(u-p) are used to model the liquefaction behavior of the sand. The soil domains are discretized using a solid-fl uid fully coupled(u-p) 20-8 noded brick element. The pile is simulated using beam-column elements. Upon careful calibration, very good agreement is obtained between the computed and the measured dynamic behavior of the ground and the pile. A parametric analysis is also conducted on the model to investigate the effect of pile-pinning, pile diameter, pile stiffness, ground inclination angle, superstructure mass and pile head restraints on the ground improvement. It is found that the pile foundation has a noticeable pinning effect that reduces the lateral soil displacement. It is observed that a larger pile diameter and fi xed pile head restraints contribute to decreasing the lateral pile deformation; however, a higher ground inclination angle tends to increase the lateral pile head displacements and pile stiffness, and superstructure mass seems to effectively infl uence the lateral pile displacements.

关键词： liquefaction pile pinning soil improvement pile deformation earthquake nonlinear fi nite element method shake-table experiment

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Response of a pile group behind quay wall to liquefaction-induced lateral spreading:a shake-table investigation

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Earthquake Engineering and Engineering Vibration 2014年第4期13卷 741-749页

作者： Tang Liang Zhang Xiaoyu Ling Xianzhang Su Lei Liu Chunhui School of Civil Engineering Harbin Institute of Technology Key lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology

The response of pile foundations near a quay wall under liquefaction-induced lateral spreading remains a complex problem. This study presents the results of a shake-table test on a 2×2 pile group behind a sheet-pile quay wall that was subjected to lateral spreading. The quay wall was employed to trigger liquefaction-induced large lateral ground deformation. The discussions focus on the behavior of the pile and the soil and on the bending moment distributions within the group pile and the restoring force characteristics at the superstructure. Overall, the piles exhibited apparent pinning effects that reduced soil deformation. In addition, the rear-row piles near the quay wall experienced larger bending moments than did the front-row piles, indicating significant pile group effects. The tests showed that lateral spreading could be a primary cause of larger monotonic deformations and bending moments. It can also be concluded that the monotonic bending moments were significantly decreased due to the presence of slow soil flow. The stiffness at the superstructure was reduced because of accumulated excess pore pressure before liquefaction, and it was recovered during lateral spreading. The present study further enhances current understanding of the behavior of low-cap pile foundations under lateral spreading.

关键词： lateral spreading liquefaction pile group behavior shake-table experiment

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Shape optimization based on ANSYS

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Journal of Information and Computational Science 2015年第11期12卷 4291-4297页

作者： Cui, Guoyong Cui, Changyu School of Civil Engineering Harbin Institute of Technology Harbin China Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin China

ANSYS has been used for structural analysis as mature finite element analysis software. This paper presents a shape optimization method which treats the ANSYS software as subroutines, therefore, eliminating the onerous compiling finite element programs and the complex theoretical derivation. The difference method sacrifices some calculation accuracy when calculating the partial differential, but it can optimize the more complex and practical problems. If the increment is small enough when calculated the partial differential, the precision can be guaranteed. Shape optimization of free-form surface is presented with the strain energy and the buckling load as objective function and optimum program complied in FORTRAN language. Studies shows that the present method is simple and effective which can be used for arbitrary structure shape optimization the average and maximum stress, the average and maximum displacement are reduced with the decrease of the strain energy and the increase of the buckling load;The ultimate strength has a large increase after optimization with considering material non-linearity and geometrical non-linearity. ©, 2015, Binary Information Press. All right reserved.

关键词： Shape optimization

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Study on the effect of the strength grade on the creep behavior of concrete

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Open Civil Engineering Journal 2015年第1期9卷 881-887页

作者： Wenzhong, Zheng Can, Tang School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin Heilongjiang150090 China

The internal factors which influenced the concrete creep behavior have been mostly divided by the creep model at home and abroad, but the computing is complex. In order to directly use the creep model in engineering conveniently, it is necessary to consider the effect of concrete strength grade on concrete creep. 302 creep test data with a loading age of 28 d, a lasting age of 360 d, and meet certain environmental conditions were collected. The strength of prism with different aspect ratio and high ratio of cylinder specimen was equivalent to the standard cube strength. The relationship between the creep compliance and creep degree and the cube compressive strength of concrete was fitted, and influence coefficient of the strength grade on the creep degree and creep coefficient were obtained. The influence coefficient can be used to determine creep value, creep coefficient, creep degree of concrete. In this paper, the effect of the strength grade on creep was considered directly, which involves the cube compressive strength of concrete from 15 MPa to 180MPa. The research results can be used in broad scope and has certain practical value.. © 2015, Wenzhong and Can;Licensee Bentham Open.

关键词： Creep

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Bond behavior between basalt fiber reinforced polymer sheet and concrete substrate: Effects of elevated temperatures and sustained load 12

Bond behavior between basalt fiber reinforced polymer sheet ...

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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： Lu, Zhongyu Xian, Guijun Li, Hui Ueda, Tamon 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 Division of Engineering and Policy for Sustainable Environment Faculty of Engineering Hokkaido University Kita 13 Jo Nishi 8 Chome Kita-ku Sapporo060-8628 Japan

This paper presents the effects of elevated temperatures and sustained load on the bond behavior between basalt fiber reinforced polymer sheet and concrete substrate. Three test replicates were performed through a single lap shear bond test. The temperatures were ranging from room temperature to 60 °C with the interval of 10 °C, and the sustained load was set as 35% peak load of the control specimens. Specimens with sustained load were exposed to elevated temperatures up to 3 h, and the failure test was performed at the elevated temperatures. Sustained load at elevated temperatures shows a significant effect on the bonding behavior. The specimens exposed at 30, 40, 50 and 60 °C increased the peak load by 9.6%, 31.2%, 29.6% and 20.2%, respectively. It was recognized that the shear stress redistributed at the concrete-BFRP interfaces during the test. The failure mode changed from concrete cohesion to adhesive failure with the increase of the temperatures. The variation of the failure patterns is attributed to the softening of the adhesion bond at elevated temperatures. © APFIS 2015. All rights reserved.

关键词： Fibers

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

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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

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