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

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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A nonlinear dynamic macro-element for demand assessment of bridge substructures subjected to ship collision

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第11期12卷 826-836页

作者： Wei FAN Wan-cheng YUAN Mi ZHOU IState Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China 2Department of Civil Engineering Purdue University West Lafayette 47907 USA Key Laboratory for Old Bridge Detection and Reinforcement Technology of Ministry of Transportation Chang＇an University Xi ＇an 710064 China

For the dynamic demand assessment of bridge structures under ship impact loading,it may be prudent to adopt analytical models which permit rapid analysis with reasonable ***,a nonlinear dynamic macro-element is proposed and implemented to quantify the demand of bridge substructures subjected to ship *** the proposed nonlinear macro-element,a combination of an elastic-plastic spring and a dashpot in parallel is employed to describe the mechanical behavior of ship-bows with strain rate *** on the analytical model using the proposed macro-element,a typical substructure under 5000 deadweight tonnage(DWT) ship collision is *** analyses indicate that the responses of the structure using the nonlinear macro-element agree with the results from the high resolution model,but the efficiency and feasibility of the proposed method increase significantly in practical ***,comparisons between some current design codes(AASHTO,JTGD60-2004,and TB10002.1-2005) and the developed dynamic analysis method suggest that these design codes may be improved,at least to consider the effect of dynamic amplification on structural demand.

关键词： Nonlinear macro-element Ship-bridge collision P-a curve Dynamic demand design codes

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State-of-the-art on resistance of bearing-type bolted connections in high strength steel

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 569-585页

作者： Guoqiang LI Yifan LYU Yanbo WANG State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China College of Civil Engineering Tongji UniversityShanghai 200092China

With the recent development of material science,high strength steel(HSS)has become a practical solution for landmark buildings and major *** current codes for design of bearing-type bolted connections of steel constructions were established based on the research of conventional *** the mechanical properties of HSS are different from those of conventional steels,more works should be done to develop the appropriate approach for the design of bearing-type bolted connections in HSS.A review of the research carried out on bearing-type bolted connections fabricated from conventional steel and HSS is *** up-to-date tests conducted at Tongji University on four connection types fabricated from three grades of HSS with nominal yield strengths of 550,690,and 890 MPa are *** previous research on failure modes,bearing resistance and the design with consideration of bolt hole elongation are *** is found that the behavior of bolted connections in HSS have no drastic difference compared to that of conventional steel *** the ductility is reduced,plastic deformation capacity of HSS is sufficient to ensure the load redistribution between different bolts with normal construction *** is also found that behavior of each bolt of multi-bolt connections arranged in perpendicular to load direction is almost identical to that of a single-bolt connection with the same end *** connections with bolts arranged in parallel to load direction,the deformation capacity of the whole connection depends on the minimum value between the end distance and the spacing distances in load *** comparison with existing design codes shows that Eurocode3 and Chinese GB50017-2017 are conservative for the design of bolted connections in HSS while AISC 360-16 may overestimate the bearing resistance of bolted connections.

关键词： High strength steel bolted connection bearing behavior design codes

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A review of CPT based axial pile design in the Netherlands

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Underground Space 2021年第1期6卷 85-99页

作者： Kenneth Gavin Meho Sasa Kovacevic David Igoe TU Delft Geo-Engineering SectionFaculty of Civil Engineering and GeosciencesDelft University of TechnologyBuilding 23Stevinweg 1PO-Box 50482628 CN Delft/2600 GA DelftNetherlands University of Zagreb Croatia Trinity College Dublin Ireland

Because of the deltaic nature of the Netherlands,deep soft soil deposits are *** to the population density exploitation of underground space is vital for commercial developments and transport *** are used as primary support elements in deep excavations,cut and cover tunnels,quay walls,flood defences and to provide uplift resistance to the base of tunnels and *** paper examines empirical correlations linking the Cone Penetration Test(CPT)end resistance qc and the resistance of deep foundations in *** is found that correlations between qc and pile end resistance are independent of pile ***,the impact of installation method,residual load,plugging and sand creep should be *** the case of shaft resistance,constant correlation factors between qc and average shaft resistance are possible for non-displacement *** the case of displacement piles,correlations that include the effects of friction fatigue and pile plugging during installation are recommended.

关键词： Piles Sand CPT based methods design codes

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Mitigation Measures of Debris Flow for Disaster Control

Mitigation Measures of Debris Flow for Disaster Control

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2014全国工程勘察学术大会

作者： DU Fengbin ZHANG Lizhou Chongqing Survey Institute Chongqing Research Institute of Geotechnical Engineering

Because of the hilly terrain,redundant rainfall and geological factors,debris flow is likely to be triggered in Southwestern China which is also exacerbated by human *** the shortage of easily developed level land,excessive excavation has to be conducted which strikes the balance of slopes,leading to the landslide problems then to the debris flow with the boosting of other *** this paper,mitigation measures against debris flow and current research methodologies for the study of debris flow dynamics will be ***,the comparison for the design of debris flow barriers will be conducted based on the design codes of China’s mainland and Hong *** merits and demerits of each code will be respectively identified which make a great contribution to the design debris-resisting barriers for highway Engineering.

关键词： Mitigation Measures Dynamic characteristics design codes

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