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A novel porous shock absorption layer for tunnels: Shock absorption performance and parameter analysis

Earthquake Engineering and Engineering Vibration 2025年第2期24卷 437-450页

作者： Zhou Tonglai Dong Changsong Li Shuang Sun Qiangqiang 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 State Key Laboratory of Green and Long-Life Road Engineering in Extreme Environment CCCC First Highway Consultants Co.Ltd.Xi’an 710075China Institute of Geotechnical Engineering College of Civil Engineering and ArchitectureHebei UniversityBaoding 017002China

A novel porous shock absorption layer is put forward in this study, and the shock absorption performance of the porous shock absorption layer is evaluated based on three-dimensional pseudo-static analysis. The modified reaction acceleration method is adopted and validated in the three-dimensional model. Seven ground motions are selected and the peak ground acceleration is adjusted to 0.2 g, 0.4 g and 0.6 g. The impact of the void ratio and thickness of the porous shock absorption layer is studied, while the surrounding rock grade and tunnel depth are also investigated. The numerical results show that the porous shock absorption layer has good shock absorption performance and can effectively reduce the maximum internal force of the secondary lining, but it cannot reduce the maximum horizontal relative displacement of the secondary lining. The circumferential rubber strip in the porous shock absorption layer will reduce shock absorption performance. The results of parameter analysis indicate that the shock absorption performance of the porous shock absorption layer increases with the increase of the void ratio and thickness, and it has good shock absorption performance under different surrounding rock grades and tunnel depths.

关键词： tunnel porous shock absorption layer shock absorption performance reaction acceleration method parameter analysis

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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： Yan, Zhi-Wei Song, Yanchen Bai, Yu-Lei Liu, Kun Faculty of Civil Engineering and Mechanics Jiangsu University Zhenjiang212013 China State Key Laboratory of Bridge Engineering Safety and Resilience Beijing University of Technology Beijing100124 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 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. © 2025

关键词： Carbon fiber reinforced plastics

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A machine learning based solver for pressure Poisson equations

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Theoretical & Applied Mechanics Letters 2022年第5期12卷 315-321页

作者： Ruilin Chen Xiaowei Jin Hui Li Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Guangdong-Hong Kong-Macao Joint Laboratory for Data-Driven Fluid Mechanics and Engineering Applications Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

When using the projection method(or fractional step method)to solve the incompressible Navier-Stokes equations,the projection step involves solving a large-scale pressure Poisson equation(PPE),which is computationally expensive and *** this study,a machine learning based method is proposed to solve the large-scale *** machine learning(ML)-block is used to completely or partially(if not sufficiently accurate)replace the traditional PPE iterative solver thus accelerating the solution of the incompressible Navier-Stokes *** ML-block is designed as a multi-scale graph neural network(GNN)framework,in which the original high-resolution graph corresponds to the discrete grids of the solution domain,graphs with the same resolution are connected by graph convolution operation,and graphs with different resolutions are connected by down/up prolongation *** well trained MLblock will act as a general-purpose PPE solver for a certain kind of flow *** proposed method is verified via solving two-dimensional Kolmogorov flows(Re=1000 and Re=5000)with different source *** the premise of achieving a specified high precision(ML-block partially replaces the traditional iterative solver),the ML-block provides a better initial iteration value for the traditional iterative solver,which greatly reduces the number of iterations of the traditional iterative solver and speeds up the solution of the *** experiments show that the ML-block has great advantages in accelerating the solving of the Navier-Stokes equations while ensuring high accuracy.

关键词： Pressure Poisson equation Machine learning Projection method Multi-scale GNN

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Experimental investigation on the impingement of synthetic jet vortex rings on a spherical wall

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Physical Review Fluids 2022年第4期7卷 044703-044703页

作者： Changlong Chen Donglai Gao Wen-Li Chen Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Key Laboratory of Structures Dynamic Behavior and Control The Ministry of Education Harbin Institute of Technology Harbin 150090 China

An experimental study was conducted to investigate the influence of sphere diameter and Reynolds number on synthetic jet vortex rings impinging on a spherical wall. Laser-induced fluorescence and two-dimensional particle image velocimetry techniques were applied to visualize flow and measure flow velocity, respectively. In this experiment, the stroke length was kept constant (L=3.6), and different diameters (d/D=1, 6, and 16) and Reynolds numbers (Resj=227 and 682) were analyzed. In addition to flow visualization images and phase-averaged λci fields, the vortex ring trajectories and circulation are presented to reveal the evolution features of the vortex rings. The results demonstrated that the Reynolds number mainly determined the strength and induced ability of the primary vortex ring (PVR) and the sphere-diameter effect was reflected by the expansion distance of the PVR and its separation from the wall boundary layer. It was found that only a secondary vortex ring (SVR) was induced in the case of a small diameter or a low Reynolds number. As the diameter and Reynolds number increased, the PVR expanded continuously along the wall and induced a SVR and tertiary vortex ring. In particular, driven by the curve, the strength of the induced vortex ring decreased with the increase in the sphere diameter.

关键词： Vortex flows Wakes & jets

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Experimental and Numerical Study on dynamic Responses of a Tlp-Type Modular Floating Structure System

SSRN

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SSRN 2024年

作者： Li, Yanwei Ren, Nianxin Cai, Wenyu Liu, Yaqiong Ou, Jinping School of Marine Science and Engineering Hainan University Haikou570228 China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan University Haikou570228 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education China

This paper explores a proposed TLP-type modular floating structure system, incorporating both central TLP modules and peripheral floating artificial reef modules. The outermost floating artificial reef module can function as a floating breakwater, and also serving as a habitat for surrounding marine organisms. Both scale model tests (1:80) and time-domain numerical simulations were performed. The simulations accounted for hydrodynamic interactions among the bodies and the mechanical coupling effects. During the scale model test, a survival strategy has been proposed to prevent collision risks between reef modules and adjacent TLP modules. A preliminary stiffness recommendation was suggested by a trade-off between the pitch of the reef module and the spring force. Numerical and experimental results have been widely compared and discussed. A good agreement has been achieved, although responses are slightly overestimated by numerical simulation due to the neglect of the viscous damping effect. In addition, the responses of the proposed system, connected with and without the outermost floating artificial reef module, have been compared and analyzed. The results suggest that the connection of the reef module can significantly reduce the system's surge response and enhance its survivability under severe sea conditions. © 2024, The Authors. All rights reserved.

关键词： dynamic response

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Research on Local Heating Technology in Extremely Low Temperature Environment Based on Thermal Comfort and CFD 18

Research on Local Heating Technology in Extremely Low Temper...

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18th IBPSA Conference on Building Simulation, BS 2023

作者： Wang, Zhen Zhang, Yuanyuan Gao, Hu Xia, Yun Wu, Yue Liu, Jing School of Architecture Harbin Institute of Technology Heilongjiang Harbin150006 China Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology China Heilongjiang Province Academy of Cold Area Building Research Heilongjiang Harbin150080 China 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 Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

This paper investigated the effect of personal heating technology on human thermal comfort and skin temperature in extremely low temperature environment. Four subjects carried out personal heating experiments in a low temperature laboratory at around -21°C. Personal heating equipment includes heating glove, heating cushion, heating mat and airwarmer. In order to maximize the thermal comfort of personnel, this paper designed an efficient local heating system based on airwarmer and heating mat. At the same time, in order to better evaluate the thermal comfort of personnel in an extremely low temperature environment, an improved one-dimensional stolwijk human thermoregulation model(HTM) was established. By combining it with CFD, the influence of the airwarmer on the thermal comfort of personnel and skin temperature was simulated. This method can be used to assess the overall thermal sensation and thermal comfort of personnel in extremely low temperature environment. © 2023 *** rights reserved.

关键词： Thermal comfort

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Compressive sensing of images for automatic crack segmentation based on generative adversarial network 10

Compressive sensing of images for automatic crack segmentati...

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10th International Conference on structural Health Monitoring of Intelligent Infrastructure, SHMII 2021

作者： Zhang, Haoyu Huang, Yong Wu, Stephen Ministry of Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Eng. Harbin Institute of Technology Heilongjiang Harbin150090 China Research Organization of Information and Systems The Institute of Statistical Mathematics 10-3 Midori-cho Tachikawa Tokyo190-8562 Japan

In a structural health monitoring (SHM) system that uses digital cameras to monitor cracks of structural surfaces, techniques for reliable and effective data compression are essential to ensure a stable and energy-efficient transmission of crack images in wireless sensing platforms such as drones and wall-climbing robots. Compressive sensing (CS) is a powerful signal processing technique, using the sparsity regularization. It allows accurate recovery of a signal from a sampling rate much smaller than the limitation of the Nyquist sampling theorem. Its hardware implementation allows down sampling of signals during the sensing process. Hence, CS methods can achieve significant energy saving for the wireless sensing devices. However, for the reconstruction of traditional CS methods, the strong assumption of the signals being highly sparse under certain bases is relatively hard to guarantee for many structural crack images. Generative adversarial network (GAN) has powerful capability to learn features of targeted images and is able to effectively capture low-dimensional representations of high-dimensional images. By exploiting the dimensionality reduction effect of GAN, we present a new approach of CS that replaces the sparsity regularization with a GAN model. Based on this new CS method, we developed a recovery framework of compressed crack images for automatic crack segmentation, in which crack images are reconstructed by directly optimizing the low dimension representation learned by GAN. In our experiments, taking advantage of the strong capability of GAN to capture the necessary features required for the crack segmentation task in compressed image data, we demonstrated the remarkable reconstruction precision, calculation speed and robustness toward noise of our recovery framework, even though the backgrounds of images are not well reconstructed. © 2021 International Conference on structural Health Monitoring of Intelligent Infrastructure: Transferring Research into

关键词： structural health monitoring

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Ordered mesoporous carbon as an efficient heterogeneous catalyst to activate peroxydisulfate for degradation of sulfadiazine

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Chinese Chemical Letters 2022年第5期33卷 2747-2752页

作者： Zhi-Ling Li Di Cao Hao Cheng Fan Chen Jun Nan Bin Liang Kai Sun Cong Huang Ai-Jie Wang State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China School of Civil&Environmental Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China School of Ecology and Environment Northwestern Polytechnical UniversityXi’an 710129China Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education School of Civil EngineeringHarbin Institute of TechnologyHarbin 150090China National Technology Innovation Center of Synthetic Biology Tianjin Institute of Industrial BiotechnologyChinese Academy of SciencesTianjin 300308China

Catalytic potential of carbon nanomaterials in peroxydisulfate(PDS)advanced oxidation systems for degradation of antibiotics remains poorly *** study revealed ordered mesoporous carbon(type CMK)acted as a superior catalyst for heterogeneous degradation of sulfadiazine(SDZ)in PDS sys-tem,with a first-order reaction kinetic constant(k)and total organic carbon(TOC)mineralization efficiency of 0.06 min^(–1) and 59.67%±3.4%within 60min,*** catalyzed PDS system exhibited high degradation efficiencies of five other sulfonamides and three other types of antibiotics,verifying the broad-degradation capacity of *** neutral pH conditions,the optimal catalytic parameters were an initial SDZ concentration of 44.0mg/L,CMK dosage of 0.07g/L,and PDS dosage of 5.44mmol/L,respectively.X-ray photoelectron spectroscopy and Raman spectrum analysis confirmed that the defect structure at edge of CMK and oxygen-containing functional groups on surface of CMK were major active sites,contributing to the high catalytic *** radical quenching analysis revealed that both SO_(4)•−and•OH were generated and participated in catalytic *** addition,direct electron transfer by CMK to activate PDS also occurred,further promoting catalytic *** of SDZ molecule was optimized using density functional theory,and the possible reaction sites in SDZ molecule were calculated using Fukui *** ultra-high-performance liquid chromatography(UPLC)–mass spectrometry(MS)/MS analysis,three potential degradation pathways were proposed,including the direct removal of SO_(2)molecules,the 14S-17N fracture,and the 19C-20N and 19C-27N cleavage of the SDZ *** study demonstrated that ordered mesoporous carbon could work as a feasible catalytic material for PDS advanced oxidation during removal of antibiotics from wastewater.

关键词： Ordered mesoporous carbon CMK Sulfadiazine Peroxydisulfate Degradation pathway Density functional theory Physicochemical properties

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dynamic Characteristics and Force Analysis of Box Girder Under Tsunami Action Based On Level-Set Method

SSRN

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SSRN 2024年

作者： Niu, Shilei Liu, Zhongxiang Guo, Tong Guo, Anxin Liu, Aimin School of Transportation Southeast University Nanjing210096 China Key Laboratory of Concrete and Prestressed Concrete Structures School of Civil Engineering Southeast University Nanjing210096 China Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology Harbin150090 China China Energy Engineering Group Jiangsu No.1 Electric Power Construction Co. Ltd. Nanjing210001 China

Tsunamis pose significant threats to the safety of sea-crossing bridges. Understanding the dynamics of wave forces and girder responses during tsunami events is crucial for ensuring their safe maintenance. In this research, a 2D numerical flume with solitary waves was utilized to simulate tsunamis. The level-set method was used for the treatment of fluid-solid interface and free surface. The interaction between the tsunami and the bridge girder was replicated through real-time data exchange between the fluid and a spring-mass-damper system. Subsequently, the hydrodynamic behaviors of the fluid surrounding the box girder and the structural responses of the girder under tsunami conditions were examined through parametric analysis. Findings suggest that tsunami with larger wave height interacts with box girder for longer duration. The maximum resistance and moment occur at the instant when the fluid acts on the top plate. Considering fluid-structure interaction and bearing constraints, increasing bearing stiffness results in substantial reductions (79.28%~85.32%) in girder displacement. Additionally, the maximum horizontal displacement of the unsubmerged box girder exceeds that of the submerged state by 2.04mm. Moreover, horizontal forces on the box girder decrease by 19.25%~45.30%, while maximum horizontal compression and tension on the wave-facing side bearing decrease by 10.7%~14.8% and 25.7%~29.9%, respectively. The maximum compression is approximately 2.68~3.34 times the maximum tension. © 2024, The Authors. All rights reserved.

关键词： Numerical methods

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Spatial Correlation of Intensity Measures of Mainshock-Aftershock Ground Motion Sequence Pairs

SSRN

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SSRN 2024年

作者： Ding, Jiawei Lu, Dagang Cao, Zheng-Gang School of Civil Engineering Harbin Institute of Technology Harbin China Key Lab of Structural Dynamic Behaviors and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Key Laboratory of Earthquake Disaster Mitigation The Ministry of Emergency Management Harbin Institute of Technology Harbin150090 China

This manuscript examines spatial correlations among ground motion intensity measures (IMs) for mainshock and aftershock, including spectral acceleration (Sa), peak ground acceleration (PGA), peak ground velocity (PGV), cumulative absolute velocity (CAV), Arias intensity (Ia), significant duration parameters (Ds5-75, Ds5-95), using a suite of 662 mainshock-aftershock ground motion sequence pairs from 13 earthquake sequences in the NGA-West2 ground motion database based on geostatistical tools. Univariate and multivariate normality of intraevent residuals of IMs for the mainshock and aftershock are verified. We proposed Adaptive Weighted Particle Swarm Optimization Algorithm—Inverse Distance Weighting (AWPSO-IDW) fitting method and use the exponential semivariogram model to fit the empirical semivariogram. An improved Monte Carlo random simulation procedure is used to evaluate the stability of the estimation and several fitting methods used in past research. The results show AWPSO-IDW fitting method is more stable and reliable than other methods, and the results show that the spatial correlation range between the mainshock-aftershock ground motions sequence pairs at different periods of spectral acceleration has a similar trend, only have differences in individual spectral acceleration periods, and the model proposed by Jayaram and Baker (2009) has been improved. Finally, this manuscript employs the spatial correlation range between the mainshock and the aftershock to generate an independent regional spatial correlation influence field. It further constructs the conditional generation of the aftershock spatial correlation influence field, considering the known mainshock spatial correlation influence field. This is achieved by adopting multivariate conditional normal characteristics between intensity measures (IMs) for both mainshocks and aftershocks. © 2024, The Authors. All rights reserved.

关键词： Monte Carlo methods

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