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A refined cellular automata method for predicting failure patterns of masonry wall panels

IOP Conference Series: Earth and Environmental Science 2019年第2期233卷

作者： Pengcheng Li Xiuli Ma Bei Du Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China School of Electronics and Information Engineering Harbin Vocation and Technical College Harbin 150081 China.

In view of the inaccuracy of the existing cellular automata (CA) technique in predicting failure patterns of masonry wall panels, this paper proposed a refined CA method which contains two measures to promote the precision of results. The optimization of matching criterion based on Taylor expansion updates the definition of state values for the CA model of wall panels and improves the accuracy of predicting the failure patterns of wall panels with opening. Besides, the post-processing of noise reduction explains the discontinuity of cracks in wall panels from the perspective of noise based on two proposed theorems, which improves the prediction of the failure patterns in appearance, continuity and clarity of cracks. Meanwhile, the difference functions and similarity of wall panels are introduced to evaluate the predicting results. Moreover, the combination of two measures shows the brilliant capacity in enhancing the accuracy and efficiency of prediction.

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Early Age Deformation of Mortar Under Sub-zero Temperature

Early Age Deformation of Mortar Under Sub-zero Temperature

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第九届水泥混凝土国际会议

作者： Ge ZHANG Haiyang Yu Yingzi YANG Key Lab of Structures Dynamic Behavior and Control Harbin Institute of TechnologyMinistry of Education School of Civil Engineering Harbin Institute of Technology

Early defonnation of mortars exposed to sub-zero temperature was *** measure the deformation precisely,a self-made defonnation test device which can be used under sub-zero temperature was *** addition,the compressive strength and dynamic modulus of elasticity of mortars exposed to sub-zero temperature were *** results showed that the deformation of mortars exposed to the sub-zero temperature at early age can be considered as 6 *** were plastic settlement stage,frost heaving stage,deformation stabilization stage,positive temperature settlement stage,positive temperature expansion stage,and re-stabilization stage,*** early compressive strength of mortars would be seriously affected by the sub-zero *** once the curing temperature was transformed to the positive temperature,it would develop *** results of the dynamic modulus of elasticity showed that the internal structure can be developed even at the sub-zero temperature,but the early internal structure of mortar would be damaged by the low temperature.

关键词： Sub-zero temperature deformation early age mortar

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Strain sensor made by thick-film resistors on substrates of glass ceramic 11

Strain sensor made by thick-film resistors on substrates of ...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Guan, Xinchun Wen, Ming Li, Hui Ou, Jinping Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology 73 Huanghe Road Nangang District Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology 73 Huanghe Road Nangang District Harbin150090 China

ISBN: (纸本)9781605953304

Thick film resistors (TFRs) were screen printed and fired on fluorophlogopite glass ceramic (FGC) substrates with low elasticity modulus. The mechanical property of FGC and piezoresistivity of TFRs were studied. Test results show the sensor has favorable performance parameters including a sensitivity of 7.888, linearity of 0.716%, repeatability of 0.764% and hysteresis of 0.982% when its input is in the range from 0-3043μϵ. The strain sensors made with TFRs on FGC substrate is possible to be used in SHM of civil engineering.

关键词： Glass ceramics

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Pseudo-dynamic testing of a fabricated composite frame with steel plate shear walls

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2017年第6期18卷 454-466页

作者： Zheng-gang CAO Peng DU Feng FAN Zhe-ming CHEN Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Shanghai Municipal Engineering Design Institute (Group) Co. Ltd Shanghai 200092 China

A pseudo-dynamic testing program was generated on a fabricated composite frame with steel plate shear walls （SPSWs） to study its seismic perlbrmance. The specimen was a three-storey single-bay frame, which was composed of H- section steel columns and composite beams, and was assembled by bolted height-adjustable steel beam-to-column connections （BHA connections）. Beam-only-connected SPSWs were selected as lateral load resisting members. The specimen was subjected to four ground motions of progressively increasing intensity. The results showed that：（1） beam-only-connected S PSWs provided sufficient lateral load resistance, lateral stiffness, and energy dissipation capacity to the fabricated frame via the tension ficld action developed in their infill panels; （2） the fabricated frame, assembled by BHA connections, exhibited substantial redundancy and good ductility; （3） an undesirable failure mode of the fabricated frame, in huge earthquakes, included severe cracking in composite beams and block shear failure in SPSWs＇ connections; （4） the inter-storey shear force distribution determined by ASCE/SE1 7-10 was verified with experimental data.

关键词： Fabricated frame Composite beam Steel plate shear walls Pseudo-dynamic test

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Influence of Sewage Sludge and Curing Conditions on the Basic Strength of Silicate Products

Influence of Sewage Sludge and Curing Conditions on the Basi...

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第九届水泥混凝土国际会议

作者： Yading ZHAO Zhenyun YU Ruozhou LIANG Minghao LIU Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigating of Industry and Information Technology Harbin Institute of Technology

Stabilization disposal and utilization of the sewage sludge has been an important research topic to be urgently solved,for the problem of large and serious pollution of solid waste emissions of *** study highlighted the variables of the dosages of sewage sludge after dried and ground and curing conditions,basic mechanical properties such as compressive strength and flexural strength of silicate products were *** obtained test results were indicated that there was a decrease in both compressive strength and flexural strength with the increase of sewage sludge content,for the increase of crystallinity,porosity and more internal defects of the *** moisture kept constant,along with the curing temperature and age in the range of 50℃ to 70℃,compressive strength of silicate products was increased,for the increase and compact structure of hydration products and interface transition zone,*** flexural strength demonstrated a decrease when the temperature greater than 70℃.However,when the curing temperature up to 90℃,compressive strength and flexural strength both exhibited a decline with the curing age longer,which was explained by the increase of crystallinity in the interface caused by the conversion of hydration products inside matrix.

关键词： sewage sludge silicate products curing conditions compressive strength flexural strength

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

Effect of different fibers on mechanical properties and duct...

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第二届新型材料与化学工业国际学术会议

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 Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology

The effect of different fibers on mechanical properties and ductility of alkaliactivated slag cementitious material（AASCM） is studied. The research contents include: fiber type（plant fiber, polypropylene fiber）, fiber content, mechanical property index, tensile stressstrain relationship curve, treating time. The test results showed that the compressive strength of two fibers reinforced AASCM was about 90 ~ 110 MPa, and the tensile strength was about 3 ~ 5 MPa. 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.

关键词： SEM Effect of different fibers on mechanical properties and ductility of alkali-activated slag cementitious material

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Long term mechanical properties of alkali activated slag

Long term mechanical properties of alkali activated slag

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第二届新型材料与化学工业国际学术会议

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 Key Lab of Structures Dynamic Behavior and Control of the Ministry Education Harbin Institute of Technology

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（KSiO） and sodium hydroxide（Na OH） 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 alkaliactivated slag are assured as hydrated calcium silicate and hydrated calcium aluminate.

关键词： Long term mechanical properties of alkali activated slag

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A novel tuned heave plate system for heave motion suppression and energy harvesting on semi-submersible platforms

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Science China(Technological Sciences) 2016年第6期59卷 897-912页

作者： LIU Kun OU Jin Ping 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 Institute of Ocean Deep Water Engineering Dalian University of Technology

Deepwater offshore structures such as semi-submersible platforms suffer powerful ocean waves due to their location and site condition. The long distance away from the shore also brings many difficulties to energy supply for the platform operation. How to reduce the response of the platform and convert the wave energy into electrical power is a meaningful topic. In this paper, a tuned heave plate system(THP) is presented and designed to be employed on a semi-submersible platform for heave motion suppression and energy harvesting. This THP system is composed of spring supports, a power take-off system(PTO), and a heave plate. The PTO system is a permanent magnet linear generator(PMLG), which could directly convert the kinetic energy of the heave plate into electronic power. The stiffness of the spring supports is designed based on the principle of the tuned mass damper(TMD). The numerical model of the platform and the THP system is established according to the hydrodynamic analysis results of the platform. The model is tested and modified by scale model tests on the platform in the wave tank. A parameter study, including the size, tuned period, and damping ratio of the THP system, is conducted systematically based on the numerical model. The optimal parameters of the THP are selected due to the maximum heave motion reduction under severe wave conditions in South China Sea. The performance of the semi-submersible with and without the THP system under different wave conditions is analyzed. It is demonstrated that this novel tuned heave plate system could reduce the heave motion of the semi-submersible platform significantly and generate considerable power, which makes the THP system have a broad prospect for development.

关键词： heave motion semi-submersible wave energy harvesting wave energy converter TMD

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Study on the effect of ground motion direction on the response of engineering structure

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Earthquake Engineering and Engineering Vibration 2016年第4期15卷 649-656页

作者： Sun Menghan Fan Feng Sun Baitao Zhi Xudong Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology School of Civil Engineering Harbin Institute of Technology Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration

Due to the randomness of earthquake wave magnitude and direction, and the uncertain direction of strong axis and weak axis in the construction of engineering structures, the effect of the direction of ground motion on a structure are studied herein. Ground motion records usually contain three vertical ground motion data, which are obtained by sensors arranged in accordance with the EW （East -West） direction, NS （South- North） direction and perpendicular to the surface （z） direction, referring to the construction standard of seismic stations. The seismic records in the EW and NS directions are converted to Cartesian coordinates in accordance with the rotation of θ = 0°-180°, and consequently, a countless group of new ground motion time histories are obtained. Then, the characteristics of the ground motion time history and response spectrum of each group were studied, resulting in the following observations：（1） the peak and phase of ground motion are changed with the rotation of direction θ, so that the direction θ of the maximum peak ground motion can be determined; （2） response spectrum values of each group of ground motions change along with the direction θ, and their peak, predominant period and declining curve are also different as the changes occur; then, the angle θ in the direction of the maximum peak value or the widest predominant period can be determined; and （3） the seismic response of structures with different directions of ground motion inputs has been analyzed under the same earthquake record, and the results show the difference. For some ground motion records, such as the Taft seismic wave, these differences are significant. Next, the Lushan middle school gymnasium structure was analyzed and the calculation was checked using the proposed method, where the internal force of the upper space truss varied from 25% to 28%. The research results presented herein can be used for reference in choosing the ground motion when checking the actual damage to struct

关键词： direction of grotmd motion structure effect coordinate transformation response spectrum

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Mechanical properties of steel fiber-reinforced reactive powder concrete at high temperature and after cooling

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Procedia Engineering 2017年 210卷 597-604页

作者： Muhammad Abid Xiaomeng Hou Wenzhong Zheng Ghulam Qadir Waqar Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China

Reactive powder concrete (RPC) is advanced cement-based material. It is produced through microstructure enhancement technique. Like other types of concretes, RPC has also been affected by severe environmental conditions such as accidental fire. Up to date, very limited research has been carried out to compare the performance of RPC at fire and after cooling. To address this gap in knowledge, the mechanical properties such as compressive strength, split-tensile strength, flexural strength and elastic modulus have been studied at high temperature and after cooling. 72 cubic specimens and 72 prismatic samples were tested. The hot and residual strength results were plotted as a function of temperature. The results indicated a higher residual strength than hot-strength in the temperature range of 20-300℃. Above 300℃, there was no sizable difference between the hot and residual strength of PRC. A comparison has also been made among the test data with current design codes.

关键词： Reactive powder concrete high temperature hot behavior residual behavior mechanical properties

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