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

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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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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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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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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Anchorage and fatigue performance of a large-diameter carbon/glass hybrid rod 7

Anchorage and fatigue performance of a large-diameter carbon...

引用

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

作者： Li, Chenggao Xian, Guijun Li, Hui 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

A novel pultruded large diameter glass fiber shell (GFS) and carbon fiber core (CFC) hybrid rod (19 mm) was developed for structural applications. In the present paper, the anchorage performance of hybrid rod was systematically studied and a novel extrusion-bonding compound anchor was proposed. The tension-tension fatigue tests were conducted with three stress levels (41.7%, 33.4% and 25.0%) and a fixed stress ratio of 0.4. It can be found the stress distribution of hybrid rod in the extrusionbonding anchor was uneven. The fatigue life of the hybrid rod conformed to the classic logarithm regression model. The fatigue damage of the hybrid FRP rod was initiated by debonding of GFS/CFC interface, leading more loads to be transferred to GFS. The fatigue failure mode was that GFS split and separate from CFC, while no obvious damage was found on CFC. © APFIS 2019. All right reserved.

关键词： Fatigue testing

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

arXiv

引用

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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Review of research methods in snow engineering for buildings

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Jianzhu Jiegou Xuebao/Journal of Building structures 2019年第6期40卷 1-13页

作者： Fan, Feng Zhang, Borui Zhang, Qingwen Liu, Mengmeng Zhang, Guolong Mo, Huamei 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

Snow engineering for buildings is a new academic discipline, which aims to investigate and forecast the influence of snowfalls on buildings and surroundings as well as the possibility of the disaster such as buildings collapse induced by snow accumulation, based on interdisciplinary researches such as physics, geophysics and catastrophology etc. This paper presents an in-depth review and analysis on the development of three main research methods, namely, field measurement, experimental research and numerical simulation. In terms of the field measurement, the development and theoretical models of several important factors, including snow transport by wind and snow melt by heat transfer, are investigated;the focus of this method in china in the future is also pointed out. Four different research techniques involved in experiments and the establishment of their similarity criterions as well as the selection of relevant parameters are summarized, followed by the necessity of establishing the professional climatic wind tunnel for snow drift research. By reviewing the progress of the computational fluid dynamics (CFD) simulation method, the achievement of existing simulation methods and their potential shortcomings are summarized so as to show the direction of the future improvements in this research method. © 2019, Editorial Office of Journal of Building structures. All right reserved.

关键词： Snow

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引用

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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Actual measurement research on snow load of heated building roof

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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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