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第三届中国国际复合材料科技大会

作者： Guan Xinchun Bai Shuai Li Hui Ou Jinping Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology

The early frost may cause serious injury to the internal pore structure of concrete, and hence has a strong influence on the impermeability and mechanical properties of concrete. In this paper, the chloride ion diffusion coefficient of different frozen level and different kind negative temperature cement-based materials was studied. The pore structures of those negative temperature cement-based materials was studied by fractal theory. The correlation between chloride ion diffusion coefficient and fractal dimension was discussed. Experimental results show that the pore structure of negative temperature cement-based materials possesses fractal characteristics and fractal dimension has good correlation with chloride ion diffusion coefficient. The results can provide a reference to application of negative temperature concrete.

关键词： Cement-based materials Negative temperature concrete Pore structure Fractal Chloride diffusion

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Analysis of load characteristics and responses of low-rise building under tornado

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Procedia Engineering 2017年 210卷 165-172页

作者： Feng Xu Jie Ma Wen-li Chen Yi-qing Xiao Zhong-dong Duan School of Civil and Environmental Engineering Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education Harbin 150090 China

In this paper, the numerical model of the tornado generator is established by using the computational fluid dynamics (CFD) method. The radar observed wind profiles of Spencer tornado (1998) are used as inlet boundary condition to form tornado wind field, and the influence of surface roughness is taken into account. This method is used to generate the tornado wind field with the same intensity as recorded in our country, and the wind load characteristics of low-rise building located in different positions in the tornado wind field are analyzed. Then the finite element model of the building is established by ANSYS software, and the building is considered as steel frame-steel plate composite wall structure, which rationality of the finite element model is determined by the modal analysis. The one-way fluid structure interaction method is adopted to transfer the tornado load to the surface of the finite element model, and the displacement response, deformation and damage state of the wall surface and roof surface of the building in different locations of the tornado wind field are analyzed in detail.

关键词： Tornado CFD Low-rise building Finite elemen model Fluid structure interaction

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Smartphones equipped with android application software for structural health monitoring

Smartphones equipped with android application software for s...

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2016 International Conference on Smart Infrastructure and Construction, ICSIC 2016

作者： Fang, K. Tian, J.D. Zhang, D.Y. Li, H. Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Harbin China Harbin Institute of Technology School of Civil Engineering Harbin China

ISBN: (纸本)9780727761279

Sensors with high accuracy, low cost, and easy integration into data acquisition system is one of the most important parts in structural health monitoring (SHM) system. In this paper, triaxial accelerometer and gyroscope embedded into the smartphones are utilized to monitor the vibration response of structure. However, in such an acquisition system, structural response data from different smartphones, compared to traditional wired accelerometers, is not always collected at the same time. So, nonsynchronous data processing technology is demonstrated comprehensively herein. First, the application based on Android operating system is described in detail. Modal identification method based on acceleration data which is collected asynchronously by different smartphones is introduced. Thus high performance SHM platform based on smartphones can be built. Then, numerical simulation study shows that modal identification method based on nonsynchronous data is feasible. At last, effectiveness and feasibility of SHM system based on the smartphones is proved in shaking table test on a three-story sheer frame building model. © The authors and ICE Publishing: All rights reserved, 2016.

关键词： Smartphones

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Long term mechanical properties of alkali activated slag

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IOP Conference Series: Materials Science and Engineering 2018年第1期292卷

作者： J Zhu W Z Zheng Z Z Xu Y F Leng C Z Qin College of Civil Engineering and Architecture Harbin University of Science and Technology Harbin 150080 Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin 150090

This article reports a study on the microstructural and long-term mechanical properties of the alkali activated slag up to 180 days, and cement paste is studied as the comparison. The mechanical properties including compressive strength, flexural strength, axis tensile strength and splitting tensile strength are analyzed. The results showed that the alkali activated slag had higher compressive and tensile strength, Slag is activated by potassium silicate (K2SiO3) and sodium hydroxide (NaOH) solutions for attaining silicate modulus of 1 using 12 potassium silicate and 5.35% sodium hydroxide. The volume dosage of water is 35% and 42%. The results indicate that alkali activated slag is a kind of rapid hardening and early strength cementitious material with excellent long-term mechanical properties. Single row of holes block compressive strength, single-hole block compressive strength and standard solid brick compressive strength basically meet engineering requirements. The microstructures of alkali activated slag are studied by X-ray diffraction (XRD). The hydration products of alkali-activated slag are assured as hydrated calcium silicate and hydrated calcium aluminate.

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Effect of different fibers on mechanical properties and ductility of alkali-activated slag cementitious material

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IOP Conference Series: Materials Science and Engineering 2018年第1期292卷

作者： J Zhu W Z Zheng C Z Qin Z Z Xu Y Q Wu College of Civil Engineering and Architecture Harbin University of Science and Technology Harbin 150080 Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology Harbin 150090

The effect of different fibers on mechanical properties and ductility of alkali-activated slag cementitious material (AASCM) is studied. The research contents include: fiber type (plant fiber, polypropylene fiber), fiber content, mechanical property index, tensile stress-strain relationship curve, treating time. The test results showed that the compressive strength of two fibers reinforced AASCM was about 90 ~ 110MPa, and the tensile strength was about 3 ~ 5MPa. The reinforcement effect of polypropylene fiber is superior to that of plant fiber, and the mechanical properties of polypropylene fiber reinforced AASCM are superior to those of plant fiber, According to the comparison of SEM pictures, the plant fiber and polypropylene fiber are both closely bound with the matrix, and the transition zones are complete and close. Thus, it is proved that plant fiber and polypropylene fiber delay the crack extension and enhance the ductility of AASCM.

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Multi-species ionic transport model for concrete coupling ion-cement hydrate interactions into Nernst-Planck equation

Multi-species ionic transport model for concrete coupling io...

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第三届中国国际复合材料科技大会

作者： Bingbing Guo Yi Hong Guofu Qiao Jinping Ou Key Lab of Structures Dynamic Behavior and Control (Harbin Institute of Technology) Ministry of Education School of Civil Engineering Harbin Institute of Technology Centre for Composite Material and Structure Harbin Institute of Technology

Reinforced concrete(RC) structures are widely used in civil engineering, but the ingress of chloride ions is one of the major factors that deteriorate the durability of RC structures. Thus, many numerical models have been reported to study the mass transport of cement-based material in the previous papers. However, most of these models did not consider the interactions between ions in the pore solution and the cement hydrate or considered the interactions by modifying the diffusion coefficients. This research presents a multi-species ionic transport model for concrete that couples ion-cement hydrate interactions into Nernst-Planck equation. Firstly, a two-phase FEM concrete geometric model that included mortar phase and coarse aggregate phase was built. Moreover, the surface complexation model and the phase-equilibrium model were used to simulate the ion-cement hydrate interactions, and Nernst-Planck equation was used to simulate the effect of the driving forces of the concentration and electric field gradients in the concrete, which were conducted by using PHREEQC code and COMSOL, respectively. Then, the interactive interface that coupled the ion-cement hydrate interactions and Nernst-Planck equation was established by using MATlab language. Finally, the results of the numerical multi-species ionic transport model for concrete were verified by the experimental data published in the previous paper.

关键词： concrete multi-species transport model ion-cement hydrate interactions Nernst-Planck equation

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Compressive sensing-based wireless sensors and sensor networks for structural health monitoring

Compressive sensing-based wireless sensors and sensor networ...

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2016 International Conference on Smart Infrastructure and Construction, ICSIC 2016

作者： Bao, Y. Li, H. Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin China Harbin Institute of Technology School of Civil Engineering Harbin China

ISBN: (纸本)9780727761279

Wireless sensor technology-based structural health monitoring (SHM) has been widely investigated recently. This paper presents the new developments and applications of compressive sensing (CS) for wireless sensors and sensor networks-based SHM in our research group. Frist, the group sprse optimization based compressive sensing for data sampling and recovery of wireless sensor network is introduced. Then, the lost data recovery for wireless sensors are presented. CS provides a data loss recovery technique, which can be embedded into smart wireless sensors and effectively increases wireless communication reliability without re-Transmitting the data;the promise of this approach is to reduce communication and thus power savings. To embed into the smart sensor, a method called random demodulator is employed to provide memory and power efficient construction of the random sampling matrix. The program is embedded into the Imote2 smart sensor platform and tested in a series of sensing and communication experiments and field tests. Lastly, the fast moving wireless sensoing technique is presened. For the fast moving wireless data transmission, the Doppler effects are the main reason causing data packet loss. A field test on a cable-stayed bridge is performed to valid the ability of the CS-based robust wireless data transmission approach in obtaining high-quality data for the fast-moving wireless sensing technique. © The authors and ICE Publishing: All rights reserved, 2016.

关键词： Compressed sensing

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Creep behavior of reinforced concrete column in consideration of sectional stress redistribution

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Jianzhu Jiegou Xuebao/Journal of Building structures 2016年第5期37卷 264-272页

作者： Zheng, Wenzhong Tang, Can Liu, Yuchen Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

In order to investigate the effect of sectional stress redistribution on creep behavior of axial compressive concrete column, creep experiments were conducted on 12 groups of 100 mm×100 mm×400 mm concrete specimens under variable compressive stress. The effect of key parameters on the creep of reinforced concrete column and the sectional stress redistribution was investigated using the program edited by the MATlab software. The results show that the spring-back strain coefficient is 0.89 when the initial stress level is not larger than 0.35, and the initial stress level decreases with the increase of the initial stress level after the initial stress level is higher than 0.35. The ultimate creep value of axial compression reinforced concrete column decreases with the prolongation of the load age, the increase of longitudinal compression steel reinforcement ratio, section size and relative humidity, the decrease of concrete strength, initial stress level and temperature. The relations between the stable ultimate creep value of axial compression reinforced C20~C50 concrete column and each key parameters were fitted based on the simulation results. © 2016, Editorial Office of Journal of Building structures. All right reserved.

关键词： Axial compression

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A new multi-coefficients shrinkage model for concrete

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Jianzhu Cailiao Xuebao/Journal of Building Materials 2016年第5期19卷 826-831页

作者： Tang, Can Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China

The contracting experiments were conducted on 69 concrete prisms, which include 5 different strength grades, 2 curing conditions, and 2 humidity environments, and experimental data of concrete shrinkage for 589d were accumulated. The influence coefficients of some factors on the shrinkage of concrete were obtained by normalization and fitting 588 experimental data collected from references. A new multi-coefficients shrinkage model for concrete was proposed based on the formula of influence coefficients and experimental data, which was suitable for the humidity from 10% to 100%, temperature from 5℃ to 80℃, theoretical thickness from 10mm to 500mm, curing time from 1d to 500d, cement content from 190kg/m3 to 500kg/m3, and water-cement ratio(by mass) from 0.35 to 0.70. The calculation results from proposed shrinkage model is agreed well with the experimental data. © 2016, Editorial Department of Journal of Building Materials. All right reserved.

关键词： Concretes

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Evaluation of bond-slip for CFRP-concrete interface using the stereovision method

Evaluation of bond-slip for CFRP-concrete interface using th...

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第三届中国国际复合材料科技大会

作者： SHAN Baohua XIAN Guijun HUO Xiaoyang PAN Yunfeg LIU Yang School of Civil Engineering Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Minning of Industry and Information Technology Harbin Institute of Technology

The bond-slip relationship for CFRP-concrete interface has become a hot research topic. Aimed at the disadvantage of traditional measurement approaches, the binocular stereovision method using epipolar constraint is proposed to measure bond-slip curves of CFRPconcrete specimens in this paper. Based on the binocular stereovision principle, DIC method is employed to match the stereovision and sequential images of left and right cameras. Matching result of right images are corrected by using epipolar constraint. In tensile test, two CFRPconcrete specimens are measured by the stereovision measurement system, experimental results show that the bond-slip curves measured by proposed stereovision method has good agreements with that of LVDTs, the error mean is 0.01 mm. This testifies the reliability and effectiveness of the proposed method, indicating that the proposed stereovision method can accurately obtain the entire bond-slip curves of CFRP-concrete interface.

关键词： stereovision digital image correlation (DIC) epipolar constraint correction CFRP-concrete interface bond-slip

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