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Experimental study on seismic behavior of interior steel fiber reinforced RPC beam-column joints

Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第3期40卷 161-171页

作者： Wang, Dehong Zheng, Wenzhong Ju, Yanzhong Wei, Chunming Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering and Architecture Northeast Electric Power University Jilin132012 China

In order to investigate the seismic behavior and shear bearing capacity of steel fiber reinforced reactive powder concrete (RPC) beam-column joints, quasi-static tests on eight RPC interior beam-column joints were carried out. The variables considered in test program included strength of reinforcement, stirrup ratio in joint core, and web rebars and vertical rebars across the joint core, and their influences on the failure mode, shear bearing capacity, hysteretic loops, energy dissipation, strength degeneration and rigidity degeneration behavior of the RPC joints were analyzed. The tests results indicate that the HRB600 longitudinal rebars in the beam mitigate the rigidity degeneration and improve the energy dissipating capacity of the specimen. An increase in stirrup ratio improves the strength degeneration and energy dissipating capacity of the specimen during the failure stages. As the transverse reinforcement ratio in joint core increases from 0 to 0.98%, the shear bearing capacity and ductility of the RPC joint increase. Web rebars and vertical rebars across the joint core improve the shear bearing capacity, strength degeneration and energy dissipation capacity of the specimen. Using the formula of GB 50011-2010 to calculate the shear bearing capacity leads to conservative results for RPC joints with a low stirrup ratio, but tends to be unsafe when the area stirrup ratio is greater than 0.98%. The predictions given by ACI 352- 02 are closer to the test result compared to the GB 50011-2010 prediction, with a safety margin of 9%- 46%. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Steel fibers

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Longitudinal shear behavior of composite slabs with recycled coarse and fine aggregate concrete

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Case Studies in Construction Materials 2025年 22卷

作者： Jiongzhuo Bai Yue Geng Yu-Yin Wang Charles K.S. Moy Huan Zhang School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang 150090 China Key Lab of Structures Dynamic Behaviour 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 Guangdong Provincial Key Laboratory of Modern Civil Engineering Technology Guangzhou 510641 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Nanning Guangxi 530004 China Department of Civil Engineering Xi’an Jiaotong-Liverpool University Suzhou 215123 China

Steel-concrete composite slabs, as efficient modern structural components, can incorporate coarse recycled aggregates (CRA) and fine recycled aggregates (FRA) as green alternatives to sand and gravel. However, existing studies have not sufficiently investigated the effects of recycled coarse and fine aggregates as well as loading history on the longitudinal shear capacity of composite slabs, and the applicability of current design methods specified in existing codes for recycled aggregate concrete (RAC) composite slabs has yet to be systematically validated. Therefore, this study systematically investigates recycled aggregates (RAs) composite slabs through experimental testing and numerical modeling. Three full-scale specimens with closed steel decking were tested under varying RAs replacement ratios (coarse/fine aggregates) and sustained load durations (0–500 days). A validated finite element (FE) model incorporating interfacial bond-slip behavior was developed, enabling 136 parametric simulations to assess m-k and partial shear connection ( PSC ) approaches following Eurocode 4. The results show: (1) RAs incorporation reduces initial stiffness and cracking load by 14.3 % and 27.1 %, respectively, but negligibly affects ultimate shear capacity; (2) 500-day sustained loading enhances shear capacity, stiffness, and cracking load by 9.3 %, 26.3 %, and 16.1 % through concrete aging; (3) Both Eurocode 4 methods demonstrate satisfactory applicability for RAs composite slab design. These results provide critical validation for sustainable composite slab engineering using recycled materials.

关键词： Steel-concrete composite slab Recycled aggregate Loading history Longitudinal shear Bearing capacity

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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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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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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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Model update technique based on time domain response sensitivity enhancement method 9

Model update technique based on time domain response sensiti...

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

作者： Liu, K. Nie, G.B. Key Lab of Structures Dynamics Behavior and Control of the Ministry of Education Harbin Institute of Technology China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering Mechanics China Earthquake Administration China

Time domain finite element model update technique, in which the measurement signals are easy to be obtaineed, can provide more equations, and it has no intermediate process error and can be directly applied to the nonlinear dynamic system, which makes the time domain finite element method more applicable. But the measurement noise bring errors in traditional time domain finite model update technique, so the time domian response sensitivity enhancement method is necessary to study. This paper propose an improved time domain response sensitivity enhancement method based on the multiple singular spectrum analysis method (MSSA), and the proposed method can deal with high measurment nosie level. The proposed method was validated by numerical simulation of a two dimensional truss model with 30% measurement noise, and the model update results were compared with those from the traditional time domain sensitivity method. The results show that the proposed method is effective, robust, and steady with high level measurement noise. © 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： Time domain analysis

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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

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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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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Properties of precast prestressed concrete slab-on-ground based on pp-fiber reinforced alkaliactivated composite 7

Properties of precast prestressed concrete slab-on-ground ba...

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7th Asia-Pacific Conference on FRP in structures, APFIS 2019

作者： Jiang, Xiaobo Cong, Xinyu Zhou, Wei School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behaviour and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9780648752899

For providing likelihood to avoid the cracking of slab-on-ground of industrial plants and logistics warehouses, this investigation is on two aspects of materials and structure. In terms of materials, the mechanical properties, shrinkage, tensile strength, fiber distribution and the concrete stress-strain curves of PP-fiber reinforced alkali-activated materials were tested, with particular emphasis on the improvement in toughness after fiber reinforcement. In terms of structure, with using a commercial software package, the entire 3-dimensional finite element models were linear elastic structures. The prestressed structural layer and the surface layer were respectively made of fiber-reinforced and nonfiber- reinforced alkali-activated concrete, the interaction between two layers was considering by inplane shear experiment and the elastic modulus and poisson's ratio obtained from the stress-strain curve are taken as parameters of surface concrete. The sliding layer is used to reduce friction and the foundation is considered to be the Winkler model. The unidirectional and bidirectional mechanical properties and the load transfer efficiency (LTE) of the precast prestressed pavement after assembly were discussed under the complex stress state, including wheel load, stacking load, temperature stress and uneven settlement of foundation. © APFIS 2019. All right reserved.

关键词： Stress-strain curves

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An attribute-based few-shot learning framework for structural damage classification 12

An attribute-based few-shot learning framework for structura...

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12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019

作者： Xu, Yang Bao, Yuequan Li, Hui Key Lab of Structures Dynamics 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 School of Civil Engineering Harbin Institute of Technology Harbin150090 China

ISBN: (纸本)9781605956015

Performances of learning algorithms for structural damage identification in the complicated real-world situations are faced with significant barriers when training a classifier from only a handful of labeled examples. Real structural local damages always contain a variety of different classes in view of material categories, surface roughness situations and structural components where they emerge. However, only limited image collections are formed and annotated with manual labels. Meta-learning can obtain a parameterized model by training with a small labeled training set and its corresponding test set. Inspired by the perceptions of object attributes transferring and few-shot learning, this study proposed an attribute-based few-shot learning approach for structural damage identification with knowledge transfer. The proposed method is expected to achieve good classification performances by few-shot meta learning and avoid underfitting encountered in the conventional supervised learning using only a few training samples. Moreover, the proposed method exploits an attribute-based transfer learning procedure based on prior knowledge extraction from source categories. The proposed framework consists of two loops, which denotes the external few-shot learning paradigm and the internal attribute-based regression NLP model, respectively. Model updating procedures are then established by using samples in support and query sets and iterations of meta-batches. © 2019 by DEStech Publications, Inc. All rights reserved.

关键词： Life cycle

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