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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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Studyon failure modeof husk mortar energy-saving wallboards 9th

Studyon failure modeof husk mortar energy-saving wallboards

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9th International Structural Engineering and Construction Conference: Resilient structures and Sustainable Construction, ISEC 2017

作者： Zhang, Yu Zhang, Qingwen Zhao, Jian Zhou, Guangchun Key Lab of Structures Dynamic Behavior and Control of Ministry of Education Harbin China Key Lab of Smart Prev. and Mitigation of Civ. Eng Disasters of the Min. of Indust. and Info. Technol Harbin China School of Civil Engineering Harbin Institute of Technology Harbin China

ISBN: (纸本)9780996043748

This paper focuses on husk mortar wallboard, which is a new type of energy-saving composite wallboard with new materials and complex working mechanism. There are eight total different dimensioned panels tested. Six of them are openings (window or door), with different opening rates;the other two are full panels with same dimensions. Based on the experimental data, they are analyzed under both horizontal and vertical direction loading, combined with the finite element analysis to reveal the working characteristics. The finite element model of husk mortar energy-saving wallboards is established by ANSYS software. Finally, the finite element results are compared with the experimental results from three aspects: ultimate load, failure mode and load displacement curve, which verifies the correctness of the finite element model. Copyright © 2017 ISEC Press.

关键词： Mortar

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Axial compression performances of concrete filled flax-basalt hybrid fibers reinforced FRP tubes 12

Axial compression performances of concrete filled flax-basal...

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Joint Conference of the 12th International Symposium on Fiber Reinforced Polymers for Reinforced Concrete structures, FRPRCS 2015 and the 5th Asia-Pacific Conference on Fiber Reinforced Polymers in structures, APFIS 2015

作者： Xia, Yuanyuan Xian, Guijun Li, Hui Key Lab. of Structural Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

Flax fiber reinforced polymer (FFRP) composites could be used in civil engineering as structural materials. To improve the mechanical properties and durability of FFRP, flax-basalt hybrid fiber reinforced polymer (HFRP) composite was developed. In the present study, unidirectional HFRP tubes were prepared with a winding process, and the compression performances of the concrete filled HFRP tubes were investigated. HFRP coupon was prepared and tested in tensile properties. The tensile results of the HFRP plate coupons shows linear in stress-strain, and hybrid with basalt fiber enhances the elongation at break remarkably. The tensile strength and modulus of the HFRP follow the rule of mixture. The concrete filled HFRP tubes exhibited much improved ultimate strength and ductility compared to those with the flax fiber tubes. The axial compression stress-strain curves were analyzed with the existing models. The coefficients of confinement of HFRP were higher than those of glass or carbon fiber based FRPs. © APFIS 2015. All rights reserved.

关键词： Fiber reinforced plastics

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CCD deflection monitoring system for Songjiazhuang cloverleaf junction 24th

CCD deflection monitoring system for Songjiazhuang cloverlea...

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24th Australasian Conference on the Mechanics of structures and Materials, ACMSM 2016

作者： Shan, Baohua Wang, Lei Huo, Xiaoyang Yuan, Wenting Xue, Zhilin Ou, Jinping 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 College of Civil Engineering and Architecture University of Jinan Jinan China

ISBN: (纸本)9781138029934

For long-term monitoring of the deflection of Songjiazhuang cloverleaf junction on 309 national roads in Zibo, this paper proposed a CCD-based bridge deflection monitoring method. Based on DIC principle, the bridge deflection is measured by tracking of targets’ position change in the FOV of CCD. The deflection monitoring software is compiled by MATlab, and the deflection monitoring system for Songjiazhuang cloverleaf junction is integrated in this paper. This deflection monitoring system has functions such as 4-channel CCD cameras image preview, simultaneous acquisition, camera calibration, deflection display and data storage. Deflection curves obtained in the field show a consistent trend, this testifies that the proposed method is reliable and can meet the long-term monitoring requirements of bridge deflection. © 2017 Taylor & Francis Group, London.

关键词： CCD cameras

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Revision of bolt connection design formulae for standard GB 50005-2017 and a comparison of the lateral resistance between national design codes

Revision of bolt connection design formulae for standard GB ...

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2018 World Conference on Timber Engineering, WCTE 2018

作者： Niu, Shuang Wang, Xiaoting Zhu, Enchun Key Lab. of Structures Dynamic Behaviour and Control Harbin Institute of Technology Ministry of Education Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China

The current China national standard Code for design of timber structures GB50005-2003 has not been revised for over a decade, and features incapability and shortcomings for the current design practice. To facilitate the revision of the code, theoretical and experimental studies were carried out on lateral resistance of bolt connections. Formulae for the coefficient of effective dowel bearing length were derived employing European Yield Modes (EYM). Test results reveal the applicability of the formulae derived, and the fact that plasticity of the bolts is not fully developed. The resistance partial factors for design were derived so as to obtain equivalent reliability level with current design code. In terms of reliability level, a concise comparison was made between the proposed design formulae for Standard GB 50005-2017 and the European and American codes. © WCTE 2018 Committee.

关键词： Bolts

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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...

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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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Strain sensor made by thick-film resistors on substrates of glass ceramic 11

Strain sensor made by thick-film resistors on substrates of ...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Guan, Xinchun Wen, Ming Li, Hui Ou, Jinping Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology 73 Huanghe Road Nangang District Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology 73 Huanghe Road Nangang District Harbin150090 China

ISBN: (纸本)9781605953304

Thick film resistors (TFRs) were screen printed and fired on fluorophlogopite glass ceramic (FGC) substrates with low elasticity modulus. The mechanical property of FGC and piezoresistivity of TFRs were studied. Test results show the sensor has favorable performance parameters including a sensitivity of 7.888, linearity of 0.716%, repeatability of 0.764% and hysteresis of 0.982% when its input is in the range from 0-3043μϵ. The strain sensors made with TFRs on FGC substrate is possible to be used in SHM of civil engineering.

关键词： Glass ceramics

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Probabilistic Seismic Safety Assessment of Chinese RC Frame structures Using Fragility Curves 2

Probabilistic Seismic Safety Assessment of Chinese RC Frame ...

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2nd International Conference on Vulnerability and Risk Analysis and Management, ICVRAM 2014 and the 6th International Symposium on Uncertainty Modeling and Analysis, ISUMA 2014

作者： Yu, Xiaohui Lu, Dagang Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education P.O. Box 2546 Harbin150090 China School of Civil Engineering Harbin Institute of Technology P.O. Box 2546 Harbin150090 China

ISBN: (纸本)9780784413609

A simulation-based procedure was adopted to generate fragility curves for five Chinese code-conforming reinforced concrete (RC) frame structures with increasing design-based earthquake (DBE) intensities. Two important elements, namely probabilistic seismic demand analysis (PSDA) and probabilistic seismic capacity analysis (PSCA), were involved in the procedure. In PSDA, 100 real ground motion records were selected to perform nonlinear time history analyses for representing the influence of earthquake uncertainties on structural demands. In PSCA, a group of ten structural parameters were considered as random, and then the conventional (deterministic) pushover analysis was extended by introducing 100 building samples according to the principle of the Latin hypercube sampling technique. From the derived pushover curves, the thresholds corresponding to the limit states -namely, "slight damage", "moderate damage", "extensive damage" and "complete damage" -were obtained for statistics. Finally, fragility curves were generated through combining the results of PSDA and PSCA, and the exceeding probabilities of the example frames conditioned on the three mostly concerned earthquake levels, i.e. frequent earthquake (FE), DBE and maximum considered earthquake (MCE), were consequently calculated. The results show that the increase of fortification earthquake intensity cannot correspondingly promote the probabilistic safety level. © 2014 American Society of Civil Engineers.

关键词： Uncertainty analysis

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Damage evaluation method for high-speed railway girder based on ultra-weak fiber Bragg grating sensing technology 8

Damage evaluation method for high-speed railway girder based...

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8th Symposium on Novel Photoelectronic Detection Technology and Applications

作者： Liu, Weikang Zhang, Xiulin Zhou, Wensong Key Lab of Structures Dynamic Behavior 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 School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

ISBN: (数字)9781510653122

ISBN: (纸本)9781510653115

Ultra-weak fiber Bragg grating (UWFBG) sensing technology has considerable multiplexing capacity on one fiber. Therefore, UWFBG have the potential of distributed monitoring, and its monitoring accuracy is higher than that of distributed optical fiber sensing technology. In this work, a novel deformation monitoring method based on UWFBG for high-speed railway girders was proposed, and the deformation of a real high-speed railway girder was monitored by UWFBG. In the test, an UWFBG array was pasted on the bottom of a real high-speed railway beam by epoxy resin, and a vibrating wire strain gauge was pasted in the middle of the span for comparison. The beam was loaded step by step through a reaction frame. During the loading process, the deformation of the beam at different positions was recorded by the UWFBG array. The results show that this method can effectively monitor the deformation of high-speed railway girder, and provide safety guarantee for the normal operation of high-speed railway. © 2022 SPIE

关键词： Deformation

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Research on a Technical Framework in Smart Construction Based on Big Data

Research on a Technical Framework in Smart Construction Base...

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2018 International Conference on Construction and Real Estate Management: Innovative Technology and Intelligent Construction, ICCREM 2018

作者： Han, Zixin Wang, Yaowu Dept. of Construction Management School of Civil Engineering Harbin Institute of Technology Harbin150000 China Dept. of Construction Management Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (数字)9780784481721

ISBN: (纸本)9780784481721

Smart construction is an important technology in the process of building a smart city. In recent years, big data has become a hot topic in the whole world. The application of big data technology in smart construction plays a significant role in promoting the construction of new urbanization. The concept and development of smart construction are introduced in this paper. The relationship between big data and smart construction is discussed based on the current development of Chinese construction industry and the difficulties encountered while applying big data technology in smart construction. Finally, the technical framework of big data technology in smart construction is also presented in this paper. © 2018 American Society of Civil Engineers.

关键词： Big data

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