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Punching shear strength of reinforced ultra-high performance concrete circular slabs with openings

structures 2025年 79卷

作者： Lanri Lin Dayong Liu Dongliang Zhang Xiangguo Wu Yun Zhang Chengen Wu Hao Wang Ya Lu College of Civil Engineering Fuzhou University Fuzhou 350108 China CGN New Energy Holdings Co. Ltd. China PowerChina Huadong Engineering Corporation Limited Hangzhou 311122 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of the Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Fujian Provincial Key Laboratory on Multi-Disasters Prevention and Mitigation in Civil Engineering Fuzhou University Fuzhou 350116 China

This study investigates the punching shear behavior of reinforced ultra-high performance concrete (RUHPC) circular slabs with openings, focusing on the effects of perforation diameter, steel fiber volume fraction and shear reinforcement ratio on punching shear strength. Experimental results reveal a novel failure mechanism where energy dissipation during punching is partitioned into radial and circumferential yield line contributions, reflecting the combined ductile and brittle failure characteristics of RUHPC. A mechanical model is developed by integrating the yield line method with the rigid body displacement approach, thereby bridging plastic hinge rotations at the slab bottom and brittle fracture at the punching surface. Utilizing this model, the study further investigates the influence of the punching-to-span ratio, slab thickness, localized loading area and reinforcement ratio on the punching shear strength. The findings provide valuable insights into the design and performance optimization of RUHPC circular slabs under punching shear conditions.

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Study on Water Absorptivity and Frost Resistance Performance of Self-ignition Coal Gangue Autoclaved Aerated Concrete

Research Square

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Research Square 2021年

作者： Cong, Xinyu Tan, Yiqiu Lu, Shuang Wang, Zhaojia Huang, Tianyong School of Transportation Science and Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education 9 Harbin Institute of Technology Harbin150090 China State Key Laboratory of Solid Waste Reuse for Building Materials Materials Academy of Science Research Beijing Building 11 Beijing100041 China

Self-ignition coal gangue (SCG) used as one of precursors to fabricate aerated autoclaved concrete (AAC). Aiming at studying water absorptivity and frost resistance performance of self-ignition coal gangue aerated autoclaved concrete (SCGAAC), three-period water absorbing tests and freezing-thawing tests were carried out and the corresponding results were recorded and analyzed. In order to modify the water absorptivity of SCGAAC, foam stabilizer was applied to adjust pore structure while calcium stearate was expected to change hydrophilic feature of CG. It was demonstrated that the compressive strength of SCGAAC containing foam stabilizer or calcium stearate declined at different levels, although the porosity became lower slightly. For water absorptivity, foam stabilizer failed to decrease the water content at any period and even increased water absorbing rates. Calcium stearate controlled water absorbing rate successfully but the ultimate water content hardly reduced. All of the SCGAAC samples exhibited intact appearance after 50 freezing-thawing cycles and showed excellent frost resistance performance. Three models were proposed to predict water absorptivity and frost resistance performance of SCGAAC and the corresponding prediction results matched test resulted ***: Self-ignition coal gangue;AAC;porosity;water absorptivity;frost resistance performance © 2021, CC BY.

关键词： Porosity

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Numerical simulation method and dent-model of circular steel tubes under low-speed impact

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Journal of Constructional Steel Research 2025年 234卷

作者： Rong Zhang Hao-wen Li Xu-dong Zhi Fang-hui Li Ming-shuo Zhao Hang Li 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 College of Civil Engineering Heilongjiang University Harbin 150086 China The College of Architecture and Civil Engineering Beijing University of Technology Beijing 100124 China

This paper presents a study on the numerical simulation methods and dent-model of circular steel tubes under transverse low-velocity impact. The study uses drop-hammer impact tests, numerical simulations, and theoretical analysis to develop a precise simulation method. It looks at how factors like mesh size, material properties, and simplifications in the impactor model affect key mechanical behaviors, such as failure modes, impact force, and displacement. A scientific simulation method of circular steel tube under low velocity transverse impact was proposed. The numerical simulation demonstrates close agreement with experimental observations in characterizing the dynamic response and failure mechanisms of circular steel-tube specimens. Critical parameters including peak impact force and displacement exhibit deviations below 10 %, verified the accuracy of the numerical model. On this foundation, a study was conducted on the cross-sectional dent-model of a circular steel tube at the impact position. In the study, the influence of hammer shape, impact velocity, circular steel pipe span, wall thickness, and diameter on it was explored. A theoretical dent-model of the cross-section at the impact position of the circular steel tube was established. Accurate estimation of the top and bottom concave displacement of the circular steel pipe at the impact position has been achieved, providing theoretical reference for structural safety assessment and accident prevention in practical engineering.

关键词： Tubular steel structures

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Long-term performance of steel-recycled aggregate concrete continuous composite beams considering the influence of installing decorative layers

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Engineering structures 2025年 339卷

作者： Xuepeng Chen Huan Zhang Yu-Yin Wang Hongzhe Dai Lilong Fan Yue Geng 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 China Railway Construction Bridge Engineering Bureau Group Co. Ltd. Tianjin 300000 China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Nanning Guangxi 530004 China

Steel-recycled aggregate concrete composite beams (SRACCBs) are preferred components for the recycled aggregate concrete (RAC) application. Due to their superior spanning ability and load-bearing capacity, steel-concrete composite beams (SCCBs) are typically more slender than traditional beam components, which makes them more sensitive to concrete shrinkage and creep. Furthermore, the incorporation of recycled aggregate (RA) significantly increases the shrinkage and creep deformation of the concrete. Therefore, the long-term properties of RAC significantly affect the application of SRACCBs. In fact, the shrinkage and creep of RAC are closely related to the boundary conditions, and the sealing effect of the steel deck and decorative layer can directly influence the long-term deformation of SCCBs. However, relevant research is currently unavailable. In this context, a 500-day long-term performance test of continuous SRACCB (4 m × 2 spans) was conducted in this paper. The test quantified the effects of incorporating RA and installing decorative layers on the mid-span deflection and end relative slip of the SRACCBs. By considering the cracking, shrinkage, and creep of RAC and long-term slip at the interface, a Direct Stiffness Method Finite Element Model (DSMFEM) for SRACCBs was established. Test results indicate that using 100 % RA can increase the mid-span deflection of the specimen by 27.9 % and the relative slip by 54.8 %; a 90-day installation of the decoration layer can lead to a 16.3 % decrease in the mid-span deflection and an 11.5 % decrease in the relative slip. The verification results of 12 sets of experimental data indicate that the proposed DSMFEM has high computational efficiency and can effectively predict the deflection and relative slip of simply-supported and continuous SCCBs. The maximum error in predicting the final mid-span deflection is 6.8 % for specimens with long-term loads and 18.4 % for specimens without loads.

关键词： Concrete aggregates

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Shaking table test on 1000kV frame by considering coupling effect of transmission lines under longitudinal excitations

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Tumu Gongcheng Xuebao/China Civil Engineering Journal 2020年第3期53卷 51-59页

作者： Gong, Jun Zhi, Xudong Shang, Wennian Fan, Feng Wang, Haoyang Key Lab of Structure 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 Shandong Electric Power Engineering Consulting Institute Co. Ltd. Jinan250013 China

To figure out the influence mechanism of the dynamic coupling effect of transmission lines on seismic responses of the 1000 kV outgoing line frame under longitudinal excitations and discuss the influence of sag-span ratios of transmission lines, shaking table tests were performed on a single-span 1000 kV outgoing line frame by considering the dynamic coupling effect of transmission lines with a scale factor of 1:***, transmission lines were simulated by the massless springs with equivalent dynamic stiffness. Test results indicate that the seismic responses of 1000 kV frame are reduced by the strong dynamic coupling effect of transmission lines;with the decrease in sag-span ratio, the energy dissipated by the suspended system increases and the elastic constraints of transmission lines on the frame enhance, resulting in further reducing the seismic responses of 1000 kV frame. Furthermore, the results of numerical reconstruction analysis of the experiments indicate that the finite element analysis can simulate the dynamic coupling effect between transmission lines and 1000 kV frame very well. © 2020, Editorial Office of China Civil Engineering Journal. All right reserved.

关键词： Electric lines

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Retraction notice to "Study on damage rules on concrete under corrosion of freeze-thaw and saline solution" [Constr. Build. Mater. 304 (2021) 124617] (Construction and Building Materials (2021) 304, (S0950061821023722), (10.1016/***.2021.124617))

引用

Construction and Building Materials 2025年 474卷

作者： Chen, Dingshi Deng, Yuang Shen, Jiyang Sun, Guorui Shi, Jun School of Civil Engineering Central South University Changsha410075 China National Engineering Laboratory for High Speed Railway Construction Changsha China Bridge Design Institute CCCC First Highway Consultants Co. Ltd. Shaanxi Xi'an710075 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Laboratory of Bridge Detection and Reinforcement Technology of Ministry of Transport Chang'an University Shaanxi Xi'an710064 China

This article has been retracted: please see Elsevier Policy on Article Withdrawal (https://***/locate/withdrawalpolicy). This article has been retracted at the request of authors with approval of the Editor-in-Chief. Following correspondence with the corresponding author requesting to retract this paper over an authorship dispute, it was determined that significant content in this paper is based on a 2019 Chang'an University Master's thesis "Study on Damage Rules of Concrete under Corrosion of Freeze-Thaw and Saline Solution" [https://***/KCMS/detail/***?dbname=CMFD202001&filename= ***] submitted by Su Youbiao and supervised by Dr. Hu Dalin. The specimens reported as "schemes 0 through 9" in this paper are taken directly from the Chang'an University Master's thesis. Results for schemes 0 through 9 are fully reported in the Chang'an University Master's thesis (Chapter 3). No indication or acknowledgement of the source of this data is provided. Neither Su Youbiao nor Hu Dalin is credited as a coauthor. The authors agree with the need to retract this paper in order to uphold and maintain the highest standards of academic integrity. © 2025 Elsevier Ltd

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

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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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Experimental and numerical study of the strengthening effects of externally bonded CFRP on defected of pipes 7

Experimental and numerical study of the strengthening effect...

引用

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

作者： Kong, Deao Xian, Guijun Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Heilongjiang 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 School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (纸本)9780648752899

Externally wrapped carbon fiber reinforced polymer (CFRP) composites have been considered to be effectively in strengthening or repairing steel pipes. In the present paper, an unidirectional carbon fiber fabric was used to strengthen steel defective pipes. The strengthening effectiveness of ISO/TS 24817 design methods and the effects of CFRP thickness on the burst pressure, failure mode and stress distribution of the repaired pipes were investigated through burst test and finite element analysis. Comparing with defected pipes, the burst pressure of the pipes enhanced by at least 100% strengthened with ISO/TS 24817 methods. The stress of CFRP decreases linearly from inner layer to outer. A simple finite element analysis method was developed to predict the burst pressure of unidirectional CFRP-wrapped defective steel pipes. © APFIS 2019. All right reserved.

关键词： Finite element method

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NSFnets (Navier-Stokes Flow nets): Physics-informed neural networks for the incompressible navier-stokes equations

arXiv

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arXiv 2020年

作者： Jin, Xiaowei Cai, Shengze Li, Hui Karniadakisc, George Em Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China Division of Applied Mathematics Brown University ProvidenceRI02912 United States

We employ physics-informed neural networks (PINNs) to simulate the incompressible flows ranging from laminar to turbulent flows. We perform PINN simulations by considering two different formulations of the Navier-Stokes equations: the velocity-pressure (VP) formulation and the vorticity-velocity (VV) formulation. We refer to these specific PINNs for the Navier-Stokes flow nets as NSFnets. Analytical solutions and direct numerical simulation (DNS) databases provide proper initial and boundary conditions for the NSFnet simulations. The spatial and temporal coordinates are the inputs of the NSFnets, while the instantaneous velocity and pressure fields are the outputs for the VP-NSFnet, and the instantaneous velocity and vorticity fields are the outputs for the VV-NSFnet. These two different forms of the Navier-Stokes equations together with the initial and boundary conditions are embedded into the loss function of the PINNs. No data is provided for the pressure to the VP-NSFnet, which is a hidden state and is obtained via the incompressibility constraint without splitting the equations. We obtain good accuracy of the NSFnet simulation results upon convergence of the loss function, verifying that NSFnets can effectively simulate complex incompressible flows using either the VP or the VV formulations. For the laminar flow solutions we show that the VV formulation is more accurate than the VP formulation. For the turbulent channel flow we show that NSFnets can sustain turbulence at Reτ ∼ 1, 000 but due to expensive training we only consider part of the channel domain and enforce velocity boundary conditions on the boundaries provided by the DNS data base. We also perform a systematic study on the weights used in the loss function for the data/physics components and investigate a new way of computing the weights dynamically to accelerate training and enhance accuracy. Our results suggest that the accuracy of NSFnets, for both laminar and turbulent flows, can be improved wi

关键词： Turbulence

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Research of snow distribution on lower roof of step roofs with gable-roof on high part

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Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 48-55页

作者： Liu, Boya Zhang, Qingwen Liu, Mengmeng 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

Step roofs are sensitive to snow loads, therefore, snow distribution on lower roof of step roofs with gable-roof on the high part was studied through model experiment. The model experiments were conducted in open air snow-wind combined laboratory developed by the Harbin Institute of Technology, which could simulate the process of natural snowfall. The experiments consisted of four models according to different slopes of the upper gable-roof, and were conducted in different wind velocities and directions. The reliability of the experiment results was verified through comparison of field measurements and experiments on step flat roofs. The results show that the higher the wind velocity, the more significant the unevenness of snow distribution, but the roof snow distribution coefficient does not increase with the wind velocity. The slope of the upper gable-roof has significant influence on snow distribution. For the model which has 60°gable roofs and is under a wind of 3m/s from the windward side, the maximum snow distribution coefficient is 7.9 which is beyond the value in Eurocode. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Roofs

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