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Multivariate stationary non-Gaussian process simulation for wind pressure fields

Earthquake Engineering and Engineering Vibration 2016年第4期15卷 729-742页

作者： Sun Ying Su Ning Wu Yue 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

Stochastic simulation is an important means of acquiring fluctuating wind pressures for wind induced response analyses in structural engineering. The wind pressure acting on a large-span space structure can be characterized as a stationary non-Gaussian field. This paper reviews several simulation algorithms related to the Spectral Representation Method （SRM） and the Static Transformation Method （STM）. Polynomial and Exponential transformation functions （PSTM and ESTM） are discussed. Deficiencies in current algorithms, with respect to accuracy, stability and efficiency, are analyzed, and the algorithms are improved for better practical application. In order to verify the improved algorithm, wind pressure fields on a large-span roof are simulated and compared with wind tunnel data. The simulation results fit well with the wind tunnel data, and the algorithm accuracy, stability and efficiency are shown to be better than those of current algorithms.

关键词： stochastic simulation non-Gaussian process static transformation method wind pressure field

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Simplified design method and seismic performance of space trusses with consideration of the influence of the stiffness of their lower supporting columns

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Earthquake Engineering and Engineering Vibration 2016年第2期15卷 401-409页

作者： Fan Feng Sun Menghan 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

Static and dynamic force performance of two types of space truss structures i.e. square pyramid space truss（SPST） and diagonal on square pyramid space truss（DSPST）, are studied to determine the effect of stiffness of their lower supporting members. A simplified model for the supporting columns and the equivalent spring mass system are presented. Furthermore, the feasibility of the simplified model is demonstrated through theoretical analysis and examples of comparative analysis of the simplified model with the entire model. Meanwhile, from the elastic analysis under frequently occurring earthquakes and elasto-plastic analysis under seldom occurring earthquakes subjected to TAFT and EL-Centro seismic oscillation it is shown that the simplified method can be encompassed in the results from the normal model. It also showed good agreement between the two methods, as well as greatly improved the computational efficiency. This study verified that the dynamic effect of the supporting structures was under considered in space truss design in the past. The method proposed in the paper has important significance for other space truss structures.

关键词： simplified supporting pyramid stiffness truss verified diagonal elasto columns seldom

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Studyon failure modeof husk mortar energy-saving wallboards 9th

Studyon failure modeof husk mortar energy-saving wallboards

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9th International Structural Engineering and Construction Conference: Resilient structures and Sustainable Construction, ISEC 2017

作者： Zhang, Yu Zhang, Qingwen Zhao, Jian Zhou, Guangchun Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin China Key Lab of Smart Prev. and Mitigation of Civ. Eng Disasters of the Min. of Indust. and Info. Technol Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043748

This paper focuses on husk mortar wallboard, which is a new type of energy-saving composite wallboard with new materials and complex working mechanism. There are eight total different dimensioned panels tested. Six of them are openings (window or door), with different opening rates;the other two are full panels with same dimensions. Based on the experimental data, they are analyzed under both horizontal and vertical direction loading, combined with the finite element analysis to reveal the working characteristics. The finite element model of husk mortar energy-saving wallboards is established by ANSYS software. Finally, the finite element results are compared with the experimental results from three aspects: ultimate load, failure mode and load displacement curve, which verifies the correctness of the finite element model. Copyright © 2017 ISEC Press.

关键词： Mortar

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Data science and engineering for structural health monitoring 8

Data science and engineering for structural health monitorin...

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8th International Conference on Structural Health Monitoring of Intelligent Infrastructure, SHMII 2017

作者： Li, H. Bao, Y.Q. Li, S.L. Ou, J.P. Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Intelligent Disaster Mitigation of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781925553055

Structural health monitoring (SHM) technology study the damage or even characteristics of disaster evolving of structures by various types of sensors installed on structures and provide scientific support for the structural design, construction, maintenance and operation safety. The significant scientific issues of SHM can be concluded as 'sensing' and 'data'. According to the widely application of SHM on civil infrastructures and accumulation of huge quantities of data, it is well-recognized that data sciences and engineering for SHM is increasingly becoming a world-wide research focus. The issue of 'data' is core target of SHM which includes the data acquisition, transmission and management, data analysis and mining, structural damage identification and structural safety assessment and so on. This paper reviews the recent research development of data sciences and engineering on our research group which includes data acquisition by compressive sensing based on group sparse optimization, computer vison and deep learning methods for data anomaly detection and structure condition assessment, the identification and modeling of spatio-temporal distribution of vehicle loads, and corrosion damage and crack identification by computer vision ***, the artificial intelligence in civil engineering is the extension of SHM technique, and will make the civil structure have ability of "see", "sensing", "thinking","talking", "action and "adapation" (2S+2T+2A). © 2017 International Society for Structural Health Monitoring of Intelligent Infrastrucure. All rights reserved.

关键词： Structural health monitoring

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Review and analysis on spalling critical temperature of concrete and fibers dosage to prevent spalling at elevated temperatures

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Jianzhu Jiegou Xuebao/Journal of Building structures 2017年第1期38卷 161-170页

作者： Chen, Mingyang Hou, Xiaomeng Zheng, Wenzhong Wu, Bo Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China State Key Laboratory of Subtropical Building Science South China University of Technology Guangzhou510640 China

The principle of fire safety design is to ensure that concrete structures will not collapse or spall during fire and can be repaired after fire. There is important significance to research the spalling critical temperature of concrete without fibers or with lower fibers and rational fibers dosage to prevent spalling at elevated temperatures. The test results on fire-induced concrete spalling were analyzed. The relationship of spalling critical temperature and concrete cube compressive strength was obtained. Results show that the spalling critical temperature decreases with the increase of concrete compressive *** relationship of volume dosage of polypropylene (PP) fibers and steel fibers to prevent spalling and concrete compressive strength was obtained. The dosage of PP fibers increases linearly with the increase of concrete compressive strength, while the dosage of steel fibers increases with the increase of concrete compressive strength and the relationship can be expressed as an exponent *** is not safe to apply the recommendation in EN 1992-1-2: 2004 'Design of concrete structures: part 1-2: general rules: structural fire design' that the volume dosage 0.22% of PP fibers in concrete to prevent spalling. The proposed formula for fibers dosage will reduce the fire-induced spalling of concrete effectively. © 2017, Editorial Office of Journal of Building structures. All right reserved.

关键词： Steel fibers

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

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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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