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Seismic Performance of Concrete Beam-Column Joints Reinforced with Carbon Fiber-Reinforced Polymer (CFRP) Bars and Stirrups 16

Seismic Performance of Concrete Beam-Column Joints Reinforce...

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16th International Symposium on Fiber-Reinforced Polymer (FRP) Reinforcement for Concrete Structures, FRPRCS 2024 at the ACI Spring 2024 Convention

作者： Qi, Ligang Cen, Guohua Liu, Chaoran Zhou, Ying Xu, Guowen Yang, Yan Li, Zhiheng Lu, Yiqiu China Construction Eighth Engineering Division Co. Ltd. Shanghai China The Shanghai Engineering Research Center of CFRP Application Technology in Civil Engineering China The Department of Disaster Mitigation for Structures School of Civil Engineering Tongji University Shanghai China

ISBN: (纸本)9781641952439

Concrete beam-column joints are critical elements in the seismic performance of reinforced concrete (RC) structures. The use of carbon fiber-reinforced polymer (CFRP) reinforcement in these joints has gained attention due to its superior mechanical properties and corrosion resistance. This paper presents a comprehensive study of the seismic performance of CFRP-reinforced concrete beam-column joints, focusing on the development of a suitable formula for estimating the seismic shear capacity. Utilizing a finite element analysis (FEA) that was both developed and validated using pre-existing test data, a comprehensive parametric study was undertaken to explore the impact of several factors. These factors encompassed axial load, longitudinal reinforcement ratio, and transverse reinforcement ratio, and their effects on the seismic performance of CFRP-RC joints were thoroughly investigated. Eventually, a suitable formula was proposed for estimating the seismic shear capacity of CFRP-RC joints. Research results will lead in a better understanding of the seismic behavior of CFRP-reinforced concrete beam-column joints, which will consequently guide the design and analysis of CFRP-reinforced concrete structures for enhanced seismic performance. © 2024 American Concrete Institute. All rights reserved.

关键词： Concrete beams and girders

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Spatiotemporal variations in ecosystem services and their trade-offs and synergies against the background of the gully control and land consolidation project on the Loess Plateau,China

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Journal of Arid Land 2024年第1期16卷 131-145页

作者： WANG Jing WEI Yulu PENG Biao LIU Siqi LI Jianfeng Key Laboratory of Degraded and Unused Land Consolidation Engineering Ministry of Natural and ResourcesXi'an 710075China Institute of Land Engineering and Technology Shaanxi Provincial Land Engineering Construction Group Co.Ltd.Xi'an 710021China School of Human Settlements and Civil Engineering Xi'an Jiaotong UniversityXi'an 710049China Shaanxi Key Laboratory of Land Consolidation Xi'an 710064China

Studying the spatiotemporal variations in ecosystem services and their interrelationships on the Loess Plateau against the background of the gully control and land consolidation(GCLC)project has significant implications for ecological protection and quality development of the Yellow River ***,in this study,we took Yan'an City,Shaanxi Province of China,as the study area,selected four typical ecosystem services,including soil conservation service,water yield service,carbon storage service,and habitat quality service,and quantitatively evaluated the spatiotemporal variation characteristics and trade-offs and synergies of ecosystem services from 2010 to 2018 using the Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)*** also analysed the relationship between the GCLC project and regional ecosystem service changes in various regions(including 1 city,2 districts,and 10 counties)of Yan'an City and proposed a coordinated development strategy between the GCLC project and the ecological *** results showed that,from 2010 to 2018,soil conservation service decreased by 7.76%,while the other three ecosystem services changed relatively little,with water yield service increasing by 0.56% and carbon storage service and habitat quality service decreasing by 0.16% and 0.14%,*** ecological environment of Yan'an City developed in a balanced way between 2010 and 2018,and the four ecosystem services showed synergistic relationships,among which the synergistic relationships between soil conservation service and water yield service and between carbon storage service and habitat quality service were *** GCLC project had a negative impact on the ecosystem services of Yan'an City,and the impact on carbon storage service was more *** study provides a theoretical basis for the scientific evaluation of the ecological benefits of the GCLC project and the realization of a win-win situation between food security and e

关键词： ecosystem services trade-offs and synergies gully control and land consolidation habitat quality Integrated Valuation of Ecosystem Services and Trade-offs(InVEST)model Loess Plateau

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Effect of Alkali Activated Slag and Sugarcane Bagasse Ash on the Properties of Indian Lateritic Soil Subgrades for Pavement Infrastructure 4th

Effect of Alkali Activated Slag and Sugarcane Bagasse Ash on...

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4th International Conference on Sustainable Development in civil, Urban and Transportation engineering, CUTE 2024

作者： Marathe, Shriram Shetty, K. Srinath Bhat, Arun Kumar Department of Materials Engineering and Construction Processes Faculty of Civil Engineering Wroclaw University of Science and Technology: Politechnika Wroclawska 27 Wroclaw50-370 Poland Karnataka574110 India

ISBN: (纸本)9789819793990

This study explores the potential of using alkali activated slag (GGBS) and sugarcane bagasse ash (SCBA) for stabilizing lateritic soil subgrades. Through a series of compaction tests, the optimal dry density was achieved with varying dosages of SCBA while maintaining a constant slag dosage of 10% by weight of the soil. The sodium hydroxide flakes (NaOH) and liquid sodium silicate (Na2SiO3) were used to produce the alkali-activator aqueous solution. The Unconfined compressive strength (UCS) and California Bearing Ratio (CBR) tests were conducted on both unstabilized and stabilized soil mixtures. The experimental investigations indicate that the strength of lateritic subgrade soil increases with the inclusion of SCBA up to a certain level (i.e., 10%), beyond which it reduces, under a constant dosage of slag. This study also proposes a pavement design using stabilized soil based on the Indian Roads Congress (IRC) guidelines for low-volume pavements, demonstrating significant reductions in total pavement thickness. The microstructural analysis is performed to understand the hardening performance upon Alkali-Activated stabilization. Co-relationships between the strength parameters (UCS and CBR) were established, allowing for the development of a simple linear regression model to understand the relationship between the strength parameters of alkali-activator stabilized lateritic soil. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Bagasse

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PFC-CFD Coupling Simulation on the Underwater Packing of Building Blocks

PFC-CFD Coupling Simulation on the Underwater Packing of Bui...

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International Conference on Geotechnics and Hydraulic Structure, GHS 2024

作者： Zhou, Heyou Liu, Guang Wu, Jicheng Zhang, Yuming Gu, Xudong Gu, Yonggen Fang, Yiqiu Anhui Construction Engineering Traffic and Shipping Group Co. Ltd. Hefei230041 China School of Civil Engineering Hefei University of Technology Hefei230009 China

ISBN: (纸本)9783031857867

In the field of water conservancy engineering, especially in projects such as large river interception, flood rescue, and guide dike construction, understanding the underwater packing behavior of building blocks under the action of water flow is of significant importance. This study aims to investigate the effects of different building block shapes (sphere, cube, pyramid, and cylinder), friction coefficients between blocks, and water flow velocities on underwater packing behavior using the coupled PFC-CFD method. The results show that the packing body formed by interlocking pyramidal blocks exhibits the highest packing efficiency and density. As the friction coefficient between blocks increases, the packing density decreases. With increasing water flow velocity, the height of the packing body gradually decreases until the structure collapses to a more stable height. These findings provide theoretical references for the design and construction of underwater engineering projects. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.

关键词： Computational fluid dynamics

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Zero-energy solution for thermal cracking to concrete: High-altitude anti-cracking coating based on radiative cooling

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Science China Technological Sciences 2025年

作者： Fuqiang WANG Jiaxin DU Xiaochuan HU Xiang LI Jintao SONG Chunzhe LI Jinze LI Liang LI Li YANG Zenghui XU School of Energy Science and Engineering Harbin Institute of Technology School of New Energy Harbin Institute of Technology at Weihai The Civil Engineering Group Corporation of China Second Engineering Bureau Ltd. China Construction Power and Environment Engineering Co. Ltd.

Concrete expansion and cracking at high altitudes present persistent challenges in construction, primarily due to extreme solar radiation and low night temperatures. Current mitigation strategies largely overlook energy regulation, relying instead on material modification and subsequent repair. However, these approaches fail to address the root cause of thermal cracking: Excessive temperature gradient within the concrete and constant temperature stress fluctuations. Recognizing that mitigating the excessive solar energy input at high altitudes is the key to solving this problem, this study introduces a highaltitude anti-cracking coating(HAAC) designed to leverage radiative cooling technology. The coating employs an innovative cooling strategy to reduce the temperature gradient and mitigate stress fluctuations in the concrete from the source successfully achieving zero-energy thermal protection for the concrete. Preliminary outdoor cooling tests, high-altitude concrete thermal protection tests, and thermal stress analyses were conducted on these materials. The results show that the application of HAAC to the concrete substrate reduced the maximum temperature by 9.9°C, decreased the day-night temperature differential by 10°C,lowered the surface thermal stress by 1.1 MPa, and limited the maximum thermal stress to only 1.9 MPa. Additionally, HAAC exhibited good weathering resistance, offering long-term thermal protection to concrete. These attributes make HAAC suitable for large-scale construction projects in high-altitude areas.

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Development of Timber-Glass Double-Skin Façade Element: Architectural and Environmental Design Perspective 4th

Development of Timber-Glass Double-Skin Façade Element: Arc...

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4th International civil engineering and Architecture Conference, CEAC 2024

作者： Lešnik Nedelko, Maja Lukić, Iva Žegarac Leskovar, Vesna Faculty of Civil Engineering Transportation Engineering and Architecture University of Maribor Maribor Slovenia Institute of Structural Design Working Group for Sustainable Construction Graz University of Technology Graz Austria

ISBN: (纸本)9789819754762

In the face of climate change, the field of architecture and building design has been focussing on the search for sustainable solutions for several decades. The design of contemporary architectural building elements, including façades, is subject to a wide range of requirements in terms of energy efficiency, building protection and environmental compatibility. Among the various types of façades, the double-skin façade performs particularly well in terms of energy efficiency and sound insulation. This is a special type of transparent building envelope consisting of two layers, in most cases insulating glazing and single glazing, separated by an air space. In contrast to existing examples of such façades, this paper shows in its first part the development of a timber-glass double skin façade element, where the first exception to existing façades is a structural frame made of timber instead of aluminium and the second exception is a load-bearing function of the element, which however is not discussed in detail in this paper. The study provides answers to the questions about the possible applications of such an element and, in the second part, about the advantages of the developed element in terms of environmental performance compared to existing elements on the market. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Sound insulation

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Experimental investigation on the invert stability of operating railway tunnels with different drainage systems using 3D printing technology

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Journal of Rock Mechanics and Geotechnical engineering 2022年第5期14卷 1470-1485页

作者： Linyi Li Junsheng Yang Jinyang Fu Shuying Wang Cong Zhang Maolong Xiang School of Civil Engineering Central South UniversityChangsha410075HunanChina National Engineering Research Center of High-speed Railway Construction Technology Changsha410075China School of Civil Engineering Central South University of Forestry and TechnologyChangsha410004China

In recent years, the invert anomalies of operating railway tunnels in water-rich areas occur frequently,which greatly affect the transportation capacity of the railway lines. Tunnel drainage system is a crucial factor to ensure the invert stability by regulating the external water pressure(EWP). By means of a threedimensional(3D) printing model, this paper experimentally investigates the deformation behavior of the invert for the tunnels with the traditional drainage system(TDS) widely used in China and its optimized drainage system(ODS) with bottom drainage function. Six test groups with a total of 110 test conditions were designed to consider the design factors and environmental factors in engineering practice,including layout of the drainage system, blockage of the drainage system and groundwater level fluctuation. It was found that there are significant differences in the water discharge, EWP and invert stability for the tunnels with the two drainage systems. Even with a dense arrangement of the external blind tubes, TDS was still difficult to eliminate the excessive EWP below the invert, which is the main cause for the invert instability. Blockage of drainage system further increased the invert uplift and aggravated the track irregularity, especially when the blockage degree is more than 50%. However, ODS can prevent these invert anomalies by reasonably controlling the EWP at tunnel bottom. Even when the groundwater level reached 60 m and the blind tubes were fully blocked, the invert stability can still be maintained and the railway track experienced a settlement of only 1.8 mm. Meanwhile, the on-site monitoring under several rainstorms further showed that the average EWP of the invert was controlled within 84 k Pa, while the maximum settlement of the track slab was only 0.92 mm, which also was in good agreement with the results of model test.

关键词： Operating railway tunnels Invert stability Tunnel drainage system Three-dimensional(3D)printing technology Model test

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Influence of Waste Crumb Rubber as a Partial Replacement for Fine Aggregates on Concrete Properties

Influence of Waste Crumb Rubber as a Partial Replacement for...

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AWAM International Conference on civil engineering, AICCE 2022

作者： Che Ani, Che Azrul Asyraaf Mohammed Al-Fasih, Mohammed Yahya Ibrahim, Izni Syahrizal Sarbini, Noor Nabilah Padil, Khairul Hazman Forensic Engineering Centre Institute for Smart Infrastructure and Innovative Construction Faculty of Civil Engineering Universiti Teknologi Malaysia Johor Johor Bahru81310 Malaysia Department of Civil Engineering College of Engineering and Information Technology Onaizah College Onaizah56447 Saudi Arabia

ISBN: (纸本)9789819960170

This study investigated the effect of using waste crumb rubber as a partial replacement for the fine aggregates on the fresh and hardened properties of normal mix concrete. Waste crumb rubber with particles sizes of 2 mm–4 mm was supplanted in the mix design of the concrete as part of the fine aggregates. Three different percentages of waste crumb rubber were considered to replace the fine aggregate which are 5%, 10%, and 15% by volume. The properties of fresh concrete were evaluated through standard slump test, while the hardened properties were examined through compressive, splitting tensile, and flexural strength tests after curing at 7 days and 28 days. Furthermore, ultrasonic pulse velocity (UPV) tests were also carried out to evaluate the integrity and quality of the crumb rubber concrete. The test results revealed that the partial replacement of the fine aggregate with waste crumb rubber significantly decreased the workability and mechanical properties of the concrete. In addition, the concrete workability decreased with the increasing substitution of the waste crumb rubber replacement to that of the fine aggregate. Similarly, by increasing substitution of the waste crumb content, the compressive strength, splitting tensile strength, and flexural strength showed a decreasing trend from the control mixture at 7 days and 28 days. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd 2024.

关键词： Concrete mixtures

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Fracture constitutive study of spring-beam model applied to slurry anchor connection

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International Journal of Wireless and Mobile Computing 2024年第2期26卷 107-114页

作者： Zhou, Wenjun Shao, Shipian Nie, Hongxin Ma, Li School of Civil Engineering Jilin University of Architecture and Technology Jilin Changchun China School of Management Shenyang Jianzhu University Liaoning Shenyang China China State Construction Railway Investment & Engineering Group Co. Ltd. Jilin Changchun China

In order to prove the feasibility of selecting the beam element attributes of the spring-beam model by parameter prediction algorithm, this study proposes a beam elements fracture constitutive model that simulates the fracture of mortar and concrete at the slurry anchor connection. By adjusting the elastic modulus, plastic strain, fracture modulus and section properties of beam elements, the results of literature tests are compared with the finite element calculation and the effects of key parameters in the beam elements fracture constitutive calculation model are analysed. The results show that the calculated slip deformation of the slurry anchor connection is controlled by the plastic strain and fracture modulus of beam elements. The mortar entry to the plasticity calculation stage is controlled by section properties of beam elements. The overall deviation of calculation from experimental results is controlled by the elasticity modulus of beam elements, and the parameter optimal solution has uniqueness. © 2024 Inderscience Enterprises Ltd.

关键词： Mortar

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Predicting torsional capacity of reinforced concrete members by data-driven machine learning models

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Frontiers of Structural and civil engineering 2024年第3期18卷 444-460页

作者： Shenggang CHEN Congcong CHEN Shengyuan LI Junying GUO Quanquan GUO Chaolai LI School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhou 211116China Jiangsu Key Laboratory Environmental Impact and Structural Safety in Engineering China University of Mining and TechnologyXuzhou 211116China China Nuclear Power Design Co.Ltd. Shenzhen 518031China School of transportation and science engineering Beihang UniversityBeijing 100191China China Construction First Group Corporation Limited Beijing 100161China

Due to the complicated three-dimensional behaviors and testing limitations of reinforced concrete(RC)members in torsion,torsional mechanism exploration and torsional performance prediction have always been *** the present paper,several machine learning models were applied to predict the torsional capacity of RC *** results of a total of 287 torsional specimens were collected through an overall literature *** of extreme gradient boosting machine(XGBM),random forest regression,back propagation artificial neural network and support vector machine,were trained and tested by 10-fold cross-validation *** performances of proposed machine learning models were evaluated and compared,both with each other and with the calculated results of existing design codes,i.e.,GB 50010,ACI 318-19,and Eurocode *** results demonstrated that better predictive performance was achieved by machine learning models,whereas GB 50010 slightly overestimated the torsional capacity,and ACI 318-19 and Eurocode 2 underestimated it,especially in the case of ACI *** XGBM model gave the most favorable predictions with R^(2)=0.999,RMSE=1.386,MAE=0.86,andλ=***,strength of concrete was the most sensitive input parameters affecting the reliability of the predictive model,followed by transverse-to-longitudinal reinforcement ratio and total reinforcement ratio.

关键词： RC members torsional capacity machine learning models design codes

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