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

作者： Lin CHI Zheng WANG Shuang LU Key Lab of Structure Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology

In this paper,electrochemical impedance spectroscopy（EIS） was adopted as a nondestructive testing method for measuring the electrical resistance and evaluating the development of compressive strength of cement ***,results of the compressive strength were obtained to evaluate the applicability and the reliability of the EIS *** between electrical resistivity and compressive strength has been estabUshed,a linear relationship can be obtained as f=k（R-R） +*** can be concluded that the electrical resistivity curves dynamically reflect strength development in cement paste and it is possible to predict compressive strength quantitatively to some *** In order to obtain the electrical resistance according to the results of electrochemical impedance spectroscopy,certain equivalent circuit was selected to assess the impedance spectroscopy *** also the relationship between electrical resistance and curing time is *** is worth emphasizing that feature point representing final setting time can also be figured out on the inflection point of the curve of ***,the effect of two kinds of fly ash on the process of cement hydration has also been *** equations reflecting the relationship between electrical resistance and compressive strength have been *** conclusion,electrochemical impedance spectroscopy is regarded as a new method to to predict the compressive strength of certain age of harden cement paste.

关键词： electrochemical impedance spectroscopy cement paste compressive strength

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Lattice Modelling of Chloride Diffusivity of Hardened Cement Paste

Lattice Modelling of Chloride Diffusivity of Hardened Cement...

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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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Seismic fragility analysis of steel-concrete composite bridges excited by near-fault ground motions

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Tumu Gongcheng Xuebao/china Civil Engineering Journal 2016年 49卷 56-60and77页

作者： Liu, Yang Lu, Dagang Yu, Xiaohui Key Lab of Structural Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai200092 China

The seismic fragility analysis was conducted for a steel-concrete composite bridge (SCCB) including the effects of the near-fault pulse-like ground motions. A total of 60 real ground motions were selected from the PEER strong earthquake database as the inputs. The global fragility curves and local fragility curves of the bridge were obtained through the fragility analysis. Compared to the fragility results of the far-field earthquake records, it is found that the demands due to the near-fault ground motions are significantly larger than that due to the far-field ground motions. Under the near-fault pulse-like ground motions, the pier is the most fragile component, while the concrete crossbeam and the studs are less fragile. © 2016, Editorial Office of china Civil Engineering Journal. All right reserved.

关键词： Concretes

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

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

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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

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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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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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