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Actual measurement research on snow load of heated building roof

Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 24-31页

作者： Zhang, Borui Zhang, Qingwen Fan, Feng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

In order to explore the influence of the building thermal environment on the roof snow load, a prefabricated building model for actual measurement was designed based on the requirement of the law of thermal coefficient (Ct) in foreign building load codes (ASCE/SEI 7-10 and ISO 4355:2013). The proposed model can change the heat resistance of roof and indoor temperature. In detail, the actual measurements of apparent density of snow and snow load under natural snow (with low moisture) and artificial snow (with high moisture) conditions in both the snowmelt period (with daily maximum temperature higher than 0℃) and the non-snowmelt period (with daily maximum temperature not higher than 0℃) were completed. The results show that the snow-layer on the building roof in the snowmelt period experiences the stages of the melt of lower surface snow, and then upward movement of melt layer with discharge of the snowmelt water. The apparent density and environmental temperature of snow show a positively correlated relationship while the variation of snow load appears a typical three-stage form, including the melting, the mass-loss and the recrystallization. Besides, the variation of snow-layer on the building roof in the non-snowmelt period is less than that in the snowmelt period, but the trend is highly consistent, where the snow load decreases with the increasing of roof heat loss. Finally, according to GB 50189-2015 and JGJ 134-2010, the thermal coefficient values of all measured conditions were calculated, and the Ct value of the building with the indoor maximum temperature about 0℃ was suggested to be 1.2. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Roofs

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Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 40-47页

作者： Liu, Mengmeng Zhang, Qingwen Qian, Yiwei Mo, Huamei Fan, Feng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

Wind-induced snowdrift phenomenon leads to the unbalanced distribution of snow on the building roofs, which could bring a huge safety hazard to the structure. The wind tunnel test is one of the main methods to study wind-induced snowdrift, and similarity theories are the bases of wind tunnel test. In this paper, the similarity theories of Kind, Iversen and Tabler were firstly summarized. After the classification, the main similarity criteria were then summarized, including Froude, Reynold, time similarity criterion and speed similarity criterion, etc. Making use of the wind-snow combined experiment facility, taking artificial snow as the simulating granular material, as well as considering characteristics of different similarity criteria sufficiently, scale experiments on snow distribution around a 0.5 m cube were conducted according to the selected similarity criterion, with the field observation on snow distribution around a 1m cube by Oikawa as the prototypes. Finally, according to the comparison of the prototypes and scale experiments,and with a full consideration of the characteristics of each similarity criterion, the similarity criterion based on the mass transfer rate of saltation process is proved to be the most reliable for the reappearance of snow distribution, and the experimental results show better agreement with the prototype when using the mean wind speed of the prototype. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Wind tunnels

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Numerical Analysis on the Effect of Vital Design Parameters on the Seismic Performance of Shear Walls with Horizontal Ring Connection

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IOP Conference Series: Earth and Environmental Science 2021年第4期719卷

作者： Jian Zhou Tao Zhang Liming Li Zhipeng Guo Qiancheng Shi China Construction Science & Technology Group Co. Ltd. Beijing 100195 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

Prefabricated shear walls are currently widely applied in mid-to-high-rise structures. As a new type of structural form of assembled shear walls, the ring connection assembled concrete shear wall has clear mechanical mechanism, easy construction and better performance and other significant advantages, which are gradually being applied in actual engineering. However, few systematic studies are carried on this new type of shear wall structure, and a complete theoretical system for guiding the design could not be given, especially in terms of mechanical mechanism and seismic performance, more detailed research work is needed. This paper uses numerical simulation as the main method to study the influence of different design variables such as shear span ratio, buckle size, axial compression ratio on the mechanical properties of the connection area in shear wall and the overall seismic performance of the structure. In this way, the theoretical basis for further optimizing the structural performance of the shear wall connection with ring connection.

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Analysis of measured data of snow loads on roof with parapets based on comparison of foreign codes

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Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 32-39页

作者： Zhang, Guolong Zhang, Qingwen Mo, Huamei Fan, Feng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

In the calculation of the snow load on the roof with parapets, standards of Japan, America, and Europe have given full consideration to the erosion effect on the snow load of the fully exposed roof caused by wind field, the movement of snow induced by wind, the supplementation of upstream snow to snow heaped up around downstream obstruction. In addition, factors such as the indoor heating and the combined effect of rain and snow are introduced to realize an accurate estimation of snow load on building roofs. By contrast, the Chinese code only considers the influence of the parapet height. Therefore, based on the measured snow distribution on an actual parapet roof on ages and the influencing factors in foreign codes introduced above, the snow distribution characteristics on the parapet roof were analyzed. The results show that: more snow is blown downstream towards the parapet;the peak snow depth close to the downstream parapet is proportional to the upstream roof width, and with an increasing wind velocity, the drifting effect is enhanced;the upstream roof width and the ground snow load have a great influence on the peak snow depth at the parapet, and the influence of wind velocity depends on the ground snow load;the larger the ground snow load is, the greater influence the wind velocity has;the ratio of the snowdrift length to the parapet height is around 3.75, and it is suggested to adopt a value of 4.0 in Chinese code. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Roofs

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The Influence of Community Opening on Road Capacity

The Influence of Community Opening on Road Capacity

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International Conference on Construction and Real Estate Management 2019: Innovative Construction Project Management and Construction Industrialization, ICCREM 2019

作者： Chen, Xue Wang, Yaowu Dept. of Construction Management Harbin Institute of Technology Harbin150000 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prev. and Mitigation of Civ. Eng. Disasters of the Min. of Indust. and Info. Technol. Harbin Institute of Technology Harbin150000 China

ISBN: (数字)9780784482308

ISBN: (纸本)9780784482308

With the development of social economy and the improvement of living standards, the drawbacks of closed residential areas have become increasingly prominent. The traditional residential area model has been unable to adapt to the development needs of China's urban core land and the needs of the growing daily life of residents. In February 2016, the "Opinions of the Central Committee of the Communist Party of China and the State Council on Further Strengthening the Management of Urban Planning and Construction" proposed that the new residential buildings in China should promote the block system. In principle, closed residential quarters will no longer be built. The completed residential quarters and unit complexes should be gradually opened. In this context, this paper builds a mathematical model based on dynamic game theory to analyze the impact of opening different types of communities on surrounding roads, and further explore whether the open community can optimize the road network structure, improve road capacity, and traffic conditions. © 2019 American Society of Civil Engineers.

关键词： Roads and streets

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苎麻表面接枝改性及其对苎麻纤维增强环氧复合材料力学性能与界面性能的影响研究（英文）

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2019年第9期20卷 660-674页

作者： Anna DILFI KF Zi-jin CHE Gui-jun XIAN Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China School of Civil Engineering Harbin Institute of TechnologyHarbin150090China

目的:通过在苎麻纤维表面接枝纳米二氧化硅颗粒,改善苎麻纤维与环氧树脂的界面粘结性能,从而提升苎麻纤维增强环氧树脂复合材料的力学性能。创新点:将纳米二氧化硅颗粒接枝到苎麻纤维表面,从而大幅提升苎麻纤维与环氧树脂的界面粘结性... 详细信息

目的:通过在苎麻纤维表面接枝纳米二氧化硅颗粒,改善苎麻纤维与环氧树脂的界面粘结性能,从而提升苎麻纤维增强环氧树脂复合材料的力学性能。创新点:将纳米二氧化硅颗粒接枝到苎麻纤维表面,从而大幅提升苎麻纤维与环氧树脂的界面粘结性能与复合材料的力学性能。方法:利用十二烷基硫酸钠均匀分散二氧化硅纳米粒子,并在硅烷偶联剂作用下,将二氧化硅纳米粒子接枝到苎麻纤维表面。结论:纳米二氧化硅接枝到苎麻纤维表面大幅提升了纤维表面粗糙度,降低了纤维亲水性能,升高了纤维与环氧树脂的界面粘度,从而改善了复合材料的力学性能。

关键词：纳米二氧化硅十二烷基硫酸硅烷偶联剂苎麻纤维力学性能界面性能

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Seismic performance of buckling-restrained braced steel frames subjected to earthquake main shock-aftershock sequences

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Journal of Physics: Conference Series 2022年第1期2230卷 012026页

作者： Chao Gong MingMing Jia XuanHao Cheng Mishel Gritcuk China Metallurgical Construction Research Institute Co. Ltd. Beijing 100088 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 Civil Engineering Harbin Institute of Technology Harbin 150090 China

Recently, there are many papers report the development of some new buckling-restrained braced (BRB) frames and the evaluation of its characteristics. At the same time self-centering buckling-restrained braced (SCBRB) frames are considered as new solutions for the increasing of the structural resilience. In this thesis, the seismic performance of structures is analyzed subjected to earthquake main shock-aftershock sequences. There is comparison of two types of the additional BRB elements, and also there is comparison between them and original steel frame to show the effect of using BRB and SCBRB elements. To compare the seismic performance of BRBF and SCBRBF, the same main shock-aftershock sequences were used in this part. Because of the flag-shaped hysteretic curve of the SCBRB elements, big amount of the energy was dissipated during the motion. Compared to steel frame, smaller seismic responses and residual deformation occurred the structure. BRBF and SCBRBF can control the seismic responses effectively due to the energy dissipation of BRB, and SCBRB can also reduce the structural residual deformation. The earthquake aftershock after earthquake main shock can increase the structural damage and enlarge the structural seismic responses.

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Stereovision measurement of 3D postures of a semi-submersible floating wind turbine model in wave test 9

Stereovision measurement of 3D postures of a semi-submersibl...

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9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019

作者： Shan, Baohua Xiao, Yiqing Li, Chao Liu, Yang Zhou, Shengtao Xue, Zhilin School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Mining of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology Shenzhen Graduate School Harbin Institute of Technology Shenzhen518055 China

To measure 3D postures of a semi-submersible floating wind turbine model in wave test, a stereovision measurement method based on a reference plane established by calibration board is proposed in this paper. The world coordinate system transforms from the left camera system to the surface of the measured structural model through the coordinate transformation. A regular wave test of semi-submersible floating wind turbine model is proceeded with the stereovision measurement system. The displacements and angles of rotation in three direction on the measured model are acquired simultaneously, and the power spectral densities of the model's displacements are calculated. Experimental results indicate that the displacement time-histories measured by the proposed stereovision method agree well with those obtained by the laser displacement meter. This verifies that the proposed stereovision approach is reliable and useful for measuring the 3D postures of multiple points on the model. © 2019 9th International Conference on Structural Health Monitoring of Intelligent Infrastructure: Transferring Research into Practice, SHMII 2019 - Conference Proceedings. All rights reserved.

关键词： Structural health monitoring

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Nanocellulose-Derived Hierarchical Carbon Framework-Supported P-Doped MoO2Nanoparticles for Optimizing Redox Kinetics in Lithium–Sulfur Batteries (Adv. Mater. 22/2025)

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Advanced Materials 2025年第22期37卷

作者： Mengjiao Shi Xue Han Wen Qu Meihui Jiang Qing Li Feng Jiang Xiang Xu Shinsuke Ifuku Chunlei Zhang Chao Wang Junfeng Hu Liansheng Yang Yuanjun Lin Haipeng Yu Shouxin Liu Jian Li Yiqiang Wu Wenshuai Chen Key Laboratory of Bio-Based Material Science and Technology of the Ministry of Education Northeast Forestry University Harbin 150040 P. R. China Sustainable Functional Biomaterials Lab Department of Wood Science University of British Columbia Vancouver BC V6T 1Z4 Canada Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology and Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 P. R. China Research Institute for Sustainable Humanosphere Kyoto University Uji 611-0011 Japan College of Materials Science and Technology Central South University of Forestry and Technology Changsha 410004 P. R. China

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Hysteretic energy prediction method for mainshock-aftershock sequences

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 277-291页

作者： Zhai Changhai Ji Duofa Wen Weiping Li Cuihua Lei Weidong Xie Lili Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHeilongjiangHarbin 150090China School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Shenzhen Graduate School Harbin Institute of Technology Shenzhen 518055China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

structures located in seismically active regions may be subjected to mainshock-aftershock（MSAS）*** study selected two kinds of MSAS sequences,with one aftershock and two aftershocks,*** aftershocksThe MSAS sequence with one aftershock exhibited a 10%to 30%hysteretic energy increase,whereas the MSAS sequence with two aftershocks presented a 20%to 40%hysteretic energy ***,a hysteretic energy prediction equation is proposed as a function of the vibration period,ductility value,and damping ratio to estimate hysteretic energy for mainshockaftershock sequences.

关键词： hysteretic energy mainshock-aftershock sequences SDOF system relative intensity prediction equation

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