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

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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Axial compression performances of concrete filled flax-basalt hybrid fibers reinforced FRP tubes 12

Axial compression performances of concrete filled flax-basal...

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

Flax fiber reinforced polymer (FFRP) composites could be used in civil engineering as structural materials. To improve the mechanical properties and durability of FFRP, flax-basalt hybrid fiber reinforced polymer (HFRP) composite was developed. In the present study, unidirectional HFRP tubes were prepared with a winding process, and the compression performances of the concrete filled HFRP tubes were investigated. HFRP coupon was prepared and tested in tensile properties. The tensile results of the HFRP plate coupons shows linear in stress-strain, and hybrid with basalt fiber enhances the elongation at break remarkably. The tensile strength and modulus of the HFRP follow the rule of mixture. The concrete filled HFRP tubes exhibited much improved ultimate strength and ductility compared to those with the flax fiber tubes. The axial compression stress-strain curves were analyzed with the existing models. The coefficients of confinement of HFRP were higher than those of glass or carbon fiber based FRPs. © APFIS 2015. All rights reserved.

关键词： Fiber reinforced plastics

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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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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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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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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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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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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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The Use of Electrical Impedance Spectroscopy for Predicting Compressive Strength of Cement Paste

The Use of Electrical Impedance Spectroscopy for Predicting ...

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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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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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Corrosion Analysis and Recognition Algorithms based on CFA and FDT in Time Domain for RC structures

Corrosion Analysis and Recognition Algorithms based on CFA a...

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2015 Fifth International Conference on Instrumentation and Measurement,Computer,Communication and control (IMCCC2015)(第五届仪器测量、计算机通信与控制国际会议)

作者： Guofu Qiao Hong Yi Jinping Ou Key Lab of Structures Dynamic Behavior and Control HIT School of Civil Engineering HIT Harbin Chi Centre for Composite Material and Structure HIT Harbin China 150090 School of Civil Engineering HIT Harbin China 150090

ISBN: (纸本)9781467377249

To quickly and conveniently determine the corrosion status of reinforced concrete (RC) structures,the analysis and recognition algorithms are established based on complex function approximation (CFA) and fractional derivative theory (FDT),*** response characteristics of universal transfer function corresponding to the step stimulus in which the dispersion and diffusion effects are simultaneously considered are analyzed in time ***,the feasibility of corrosion recognition algorithm based on FDT is verified numerically according to the results of CFA algorithm.

关键词： reinforced concrete structures corrosion monitoring time domain complex function approximation fractional derivative theory

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