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An Integrated Seismic Assessment Method for Urban Buildings and Roads

International Journal of Disaster Risk Science 2024年第6期15卷 935-953页

作者： Siwei Zhang Shuang Li Changhai Zhai Jia Xiao Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

Seismic simulation of urban buildings and roads is significant for regional pre-disaster mitigation and post-disaster *** consider the interrelated influences of buildings and roads,an integrated seismic assessment method for urban buildings and roads is *** seismic damages of buildings were assessed using various methods based on structural characteristics and different degrees of available building *** physical and topological characteristics of the road network are considered in the proposed method to determine post-earthquake road network traffic *** quantitatively evaluate post-earthquake road network traffic capacity,we comprehensively considered the seismic damage to roads,blockages caused by earthquake-induced debris,and the potential risk of falling debris from damaged *** proposed integrated seismic assessment method was applied to a real earthquake event to demonstrate its feasibility and effectiveness,and also applied to a real city,of which information on buildings and roads was based on open-source data and statistical data,to demonstrate its *** proposed method provides a solid prediction on the seismic performance of urban buildings and road networks,serving as a reference for urban earthquake disaster rescue and relief.

关键词： Earthquake-induced debris Integrated seismic assessment Post-earthquake road traffic capacity Seismic structural damage Urban areas

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dynamic shear responses of RC circular columns strengthened with recycled FRPs

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structures 2025年 78卷

作者： Zhi-Wei Yan Yanchen Song Yu-Lei Bai Kun Liu Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang 212013 China State Key Laboratory of Bridge Engineering Safety and Resilience Beijing University of Technology Beijing 100124 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

Increasingly heavy urban traffic exacerbates vehicle impacts on reinforced concrete (RC) bridge columns, possibly leading to shear failure and structural collapse. To enhance the dynamic shear resistance of these columns, fiber reinforced polymers (FRPs) made from recycled polyethylene terephthalate (PET) plastic bottles were used for external strengthening. PET FRPs offer an eco-friendly alternative by repurposing plastic waste, reducing pollution, and promoting circular economy. This study focused on the dynamic shear responses of RC columns strengthened with PET FRPs. The influences of FRP types and number of FRP layers were experimentally revealed in terms of the failure modes, impact force, reaction force, shear force and impact force-displacement relationship. It was found that significant shear damage occurred in RC columns under horizontal impact loads, with carbon FRPs (CFRPs) strengthening unable to alter the failure mode. Nevertheless, the use of PET FRPs transformed the failure mode to a flexural-shear mode, significantly reducing the impact duration, maximum and residual displacements, and energy dissipation. Moreover, a finite element model was validated to describe the impact resistance of PET FRP-strengthened RC columns, as supported by experimental data. A parametric study further investigated the effects of impact velocity, impact mass, number of FRP layers, and reinforcement ratios on the dynamic shear responses. Based on the truss-arch model, a dynamic shear strength model was proposed and can well predict the dynamic shear capacity of FRP-strengthened RC circular columns.

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Chemically bonded multi-nanolayer inorganic aerogel with a record-low thermal conductivity in a vacuum

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National Science Review 2023年第10期10卷 96-105页

作者： Hongxuan Yu Menglin Li Yuanpeng Deng Shubin Fu Jingran Guo Han Zhao Jianing Zhang Shixuan Dang Pengyu Zhang Jian Zhou Dizhou Liu Duola Wang Chuanwei Zhang Menglong Hao Xiang Xu 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 Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast University Key Lab of Aerospace Bearing Technology and Equipment of the Ministry of Industry and Information Technology Harbin Institute of Technology

Inorganic aerogels have exhibited many superior characteristics with extensive applications,but are still plagued by a nearly century-old tradeoff between their mechanical and thermal *** reducing thermal conductivity by ultralow density,inorganic aerogels generally suffer from large fragility due to their brittle nature or weak joint crosslinking,while enhancing the mechanical robustness by material design and structural engineering,they easily sacrifice thermal insulation and ***,we report a chemically bonded multi-nanolayer design and synthesis of a graphene/amorphous boron nitride aerogel to address this typical tradeoff to further enhance mechanical and thermal *** to the chemically bonded interface and coupled toughening effect,our aerogels display a low density of 0.8 mg cm-3with ultrahigh flexibility（elastic compressive strain up to 99% and bending strain up to 90%）,and exceptional thermostability（strength degradation <3% after sharp thermal shocks）,as well as the lowest thermal conductivities in a vacuum(only 1.57 mW m-1K-1at room temperature and 10.39 mW m-1K-1at500℃) among solid materials to *** unique combination of mechanical and thermal properties offers an attractive material system for thermal superinsulation at extreme conditions.

关键词： inorganic aerogels multi-nanolayer mechanical-thermal tradeoff flexibility thermal superinsulation

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Study on the effect of the strength grade on the creep behavior of concrete

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Open Civil Engineering Journal 2015年第1期9卷 881-887页

作者： Wenzhong, Zheng Can, Tang School of Civil Engineering Harbin Institute of Technology Harbin Heilongjiang150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin Heilongjiang150090 China

The internal factors which influenced the concrete creep behavior have been mostly divided by the creep model at home and abroad, but the computing is complex. In order to directly use the creep model in engineering conveniently, it is necessary to consider the effect of concrete strength grade on concrete creep. 302 creep test data with a loading age of 28 d, a lasting age of 360 d, and meet certain environmental conditions were collected. The strength of prism with different aspect ratio and high ratio of cylinder specimen was equivalent to the standard cube strength. The relationship between the creep compliance and creep degree and the cube compressive strength of concrete was fitted, and influence coefficient of the strength grade on the creep degree and creep coefficient were obtained. The influence coefficient can be used to determine creep value, creep coefficient, creep degree of concrete. In this paper, the effect of the strength grade on creep was considered directly, which involves the cube compressive strength of concrete from 15 MPa to 180MPa. The research results can be used in broad scope and has certain practical value.. © 2015, Wenzhong and Can;Licensee Bentham Open.

关键词： Creep

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Comparjsion of seismic performance of rc precast fabricated shear wall with different infillled opening

Comparjsion of seismic performance of rc precast fabricated ...

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2015 fib Symposium: Concrete - Innovation and Design

作者： Zhai, Ximei Hu, Wenbo Key Lab. of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin Heilongjiang150090 China

A new method to infill the opening in the RC precast fabricated concrete shear wall was applied in China. In this paper, three geometrically identical RC precast fabricated shear wall specimens were experimented under constant axial load and quasi-statie cyclic lateral loading. The methods to infill the opening of the wall were respectively integration infill, masonry infill and without infill. Hysteretic curves, skeleton curves, failure process, variation of rebar strain, stiffness, ductility and energy-dissipating capacity were obtained. The results showed that the integration shear wall owns good seismic performance. Its bearing capacity, stiffness, energy-dissipating capacity are excellent while ductility is relatively poor. Masonry infilled wall and wall without infill also own good seismic performance. Meanwhile, numerical simulation of three specimens was conducted by using finite element (FE) software OpenSees. Based on the reasonable modeling and the application of multi-layer shell element, the FE results were verified with the experimental results.

关键词： Shear walls

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Time-dependent reliability prediction analysis of bridge members considering dependence of failure modes and proof modes

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key Engineering Materials 2015年第1期648卷 25-34页

作者： Liu, Yuefei Lu, Dagang Key Laboratory of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

Structural health monitoring systems used in bridges contain sensors providing a large amount of monitored data, such as stress, deflection and ***. In this paper, firstly, based on monitored everyday extreme stress data, time-variant proof load effects of structural members were defined, and based on the time-dependent proof load effects, the time-dependent performance functions of structural member's proof modes were built;and then based on the monitored data, the Bayesian dynamic models(BDMs) of extreme stresses were built, and based on the predicted extreme stress with BDMs, the time-variant performance functions of structural member's failure modes were given;and then based on the time-dependent performance functions of failure modes and proof modes and correlation coefficients between them, with the conditional probability method, the time-dependent reliability indices of structural members were updated and predicted;finally an actual engineering was provided to illustrate the application of the proposed models and methods. © 2015 Trans Tech Publications, Switzerland.

关键词： dynamic models

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Self-powered real-time fault monitoring for drone blades

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Nano Energy 2025年 140卷

作者： Lu, Xiao Zhong, Songyi Zhou, Chenghao Tian, Shiwei Zhou, Wangjie Zheng, Qiwei Li, Long Jin, Tao Zhang, Quan Zhang, Rong Yue, Tao Xie, Shaorong School of Computer Engineering and Science Shanghai University Shanghai200444 China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics School of Mechatronics Engineering and Automation Shanghai University Shanghai200444 China School of Electrical Engineering and Automation Anhui University Hefei230601 China School of Future Technology Shanghai University Shanghai200444 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 of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Shanghai Institute of Intelligent Science and Technology Tongji University Shanghai200092 China Shanghai Key Laboratory of Intelligent Connected Vehicle Cybersecurity Shanghai200444 China

The vigorous development of the low - altitude economy is accompanied by a large number of small-drone being put into the market. The safety issues of drones have become increasingly prominent. In particular, the health condition of drone blades is directly related to the flight stability. Here, we introduce an innovative non-contact approach for monitoring drone blade faults utilizing acoustic signals. This methodology employs triboelectric sensor as acoustic-electric transducers, offering heightened sensitivity in acoustic signal acquisition. Through simulated fault experiments mirroring real flight scenarios, we constructed a triboelectric sensor based fault acoustic dataset. By integrating Convolutional Neural Network (CNN) with Transformer architecture, we effectively extracted intricate time-frequency features from the acoustic signals, achieving precise classification of four prevalent drone blade faults: crack, fracture, foreign object attachment, and edge deformation, with an accuracy rate of up to 95.1 %. Moreover, we developed a real-time monitoring system tailored for drone blade faults, showing its pivotal role in bolstering flight safety. This work constitutes a technological cornerstone for advancing the realm of intelligent, automated, and real-time drone blade fault monitoring. © 2025 Elsevier Ltd

关键词： Acoustic noise

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A mechanics-informed neural network method for structural modal identification: application to closely spaced modes

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Journal of Sound and Vibration 2025年 612卷

作者： Liu, Dawei Bao, Yuequan 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 Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

This paper investigates the mechanics-informed neural network (MINN) method for identifying closely spaced modes. The main contribution of this study lies in clearly illustrating the principle that the MINN method can discern closely spaced modes and validating the method's effectiveness in identifying closely spaced modes. Large structures typically have closely spaced modes, which pose significant challenges for traditional modal parameter identification methods. This study investigates the ability of MINN method for extracting closely spaced modes. The unique aspect of the MINN method lies in utilizing the characteristic that single source point ratios correspond to mode shapes. Besides, embedding of sparsity and independence in the neural network can increase effective redundancy, which is beneficial for accurate identification of model parameters. The time-domain vibration data and time-frequency (TF) domain single-source points (SSPs) are set as inputs to the network. The process then employs sparsity-constrained neural networks and cross-correlation minimization constrained neural networks to cluster SSPs, combined with modal response independence to solve for modal responses and mode shape results. Then, frequencies and damping ratios are calculated using the modal responses. A numerical simulation and an actual large-span spatial structure are employed to illustrate the efficacy of the MINN method. The method achieved a frequency resolution of 0.0148 Hz in the numerical simulation and successfully identified closely spaced modes with a frequency interval above 0.0761 Hz in the real-world structure. Traditional methods can only achieve identification of closely spaced modes with a frequency interval above 0.0508 Hz in the numerical simulation and closely spaced modes with a frequency interval above 0.1622 Hz in the real-world structure. The MINN method outperforms traditional methods by reducing frequency intervals for closely spaced modes from 0.0508 Hz to

关键词： Numerical methods

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Mechanical properties of extrusion-based 3D-printed concrete considering the thickness of the printed layer and printing time interval

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structures 2025年 78卷

作者： Boyang Tang Jiachuan Yan Xiaoyu Han Yini Lin Feng Fan 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

This paper investigated the performance of 3D printed concrete with a focus on the bonding layer, considering the thickness of the printed layers. Through experimental testing and numerical simulation, the mechanical properties and failure mechanisms of the bonding layer were thoroughly analyzed. The results revealed that compressive strength diminishes with thinner layers and longer printing intervals, while anisotropic mechanical properties become increasingly pronounced with reduced layer thickness. The static performance of 3D printed concrete arches was also studied, showing that increased layer thickness enhances the ultimate load bearing capacity. Cohesive elements were used to simulate compressive strength across varying layer thicknesses and printing time intervals. Prediction formulae for compressive strength were developed and validated through experimental data. The study further simulated the static performance of arches using both cohesive elements and anisotropic material properties, confirming the accuracy of the strength prediction formulae and the effectiveness of the simulation methods.

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Mechanical properties of an innovative variable stiffness bonded-type anchorage for CFRP cables

Transactions of Materials Research

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Transactions of Materials Research 2025年第2期1卷

作者： Yanzhao Niu Makeev Aleksander Chen Wang Rui Guo Guijun Xian 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 School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

To address the challenges of anchoring Carbon Fiber Reinforced Polymer (CFRP) cables, this paper presents an innovative variable stiffness bonded-type anchorage, which builds upon traditional anchorage designs and incorporates high-temperature resistant bonding media with variable stiffness, along with bent CFRP cables. To evaluate the anchoring performance of this anchorage, mechanical tests were conducted and compared with traditional bond-type anchorage systems. The results show that when the bending angle of CFRP bars exceeds 4°, the tensile strength will be less than 95 % of ultimate strength. As the amount of additive increases, both the tensile strength and elastic modulus of the high-temperature resistant bonding medium gradually improve. The mechanical properties of the high-temperature resistant bonding medium are similar to those of traditional bonding media, but its glass transition temperature ( T g ) is significantly higher than that of traditional bonding media. Additionally, when the bonding layer thickness exceeds 2 mm, it has no effect on the bonding performance. The average bonding stress gradually decreases as the anchorage length increases and the internal cone angle decreases. Furthermore, the Ф4-7 and Ф4-19 CFRP cables anchored by VB anchorage demonstrate ideal brittle failure modes, with anchorage efficiencies exceeding 95 %, and the average slip amounts are 2.78 mm and 5.44 mm, respectively, and the anchorage demonstrates good stability. In contrast, EP anchorage shows less desirable failure modes, with most anchorage efficiencies falling below 95 %. The average slip amounts are 3.22 mm and 7.62 mm, but the results display greater variability.

关键词： CFRP cable Variable stiffness bonding-type anchorage Tensile test High-temperature resin Anchoring performance

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