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Using Decision Tree J48 Based Machine Learning Algorithm for Flood Susceptibility Mapping: A Case Study in Quang Binh Province, Vietnam 6th

Using Decision Tree J48 Based Machine Learning Algorithm for...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Chinh Luu Duc-Dam Nguyen Tran Van Phong Prakash, Indra Binh Thai Pham Natl Univ Civil Engn Fac Hydraul Engn Hanoi 100000 Vietnam Univ Transport Technol 54 Trieu Khuc Hanoi 100000 Vietnam Vietnam Acad Sci & Technol VAST Inst Geol Sci Hanoi 100000 Vietnam Geol Survey India Gandhinagar 382010 Guj India

ISBN: (纸本)9789811671609;9789811671593

Flood is a dangerous natural hazard causing loss of life, property, and infrastructure besides affecting the economy and social life of a country. Vietnam is facing flood hazard problem recurrently mainly due to its topography, hydrology and climatic condition;and dense population. Therefore, it is necessary to develop an accurate flood susceptibility map to identify the areas likely to be affected by flooding to minimize potential damages of the flood hazard. This study deals with flood-susceptibility mapping using machine learning based on J48 decision trees algorithm for identifying in advance flood susceptible areas. In this study, we have used ten important flood affecting factors, namely Elevation, Slope, Curvature, River Density, Distance from River, Geomorphology, Land Use, FlowAccumulation, Flow Direction, and Rainfall, for the model development. Flood inventory of 318 locations was used for randomly splitting dataset in 70:30 ratio for model training (70%) and validation (30%). The model performance was evaluated using standard statistical measures. The results indicated that the decision tree (J48) model has high predictive performance (AUC = 0.97). Therefore, this model can be used to develop a reliable and accurate flood susceptibility map of an area for proper planning, flood risk management, and mitigation.

关键词： Machine learning Decision tree Flood susceptibility Quang Binh province Vietnam

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Iron-Based Shape Memory Alloy Strengthening of a 113-Years Steel Bridge 10th

Iron-Based Shape Memory Alloy Strengthening of a 113-Years S...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Vujtech, Jakub Ryjacek, Pavel Matos, Jose Campos Ghafoori, Elyas Czech Tech Univ Fac Civil Engn Thakurova 7 Prague 16629 Czech Republic Univ Minho Dept Civil Engn ISISE P-4800058 Guimaraes Portugal Swiss Fed Labs Mat Sci & Technol Uberlandstr 129 C-8600 Dubendorf Switzerland

ISBN: (纸本)9783030881665;9783030881658

This paper presents an application of iron-based shape memory alloy (Fe-SMA) for the strengthening of metallic girder of a historical roadway bridge in Petrov nad Desnou, Czech Republic. This is, to the best of author's knowledge, the first application of Fe-SMA for strengthening of bridge structure worldwide, as the previous applications were mainly on building structures. The shape memory effect (SME) of Fe-SMA was used for prestressing of the steel girder. The SME is material property of deformed Fe-SMA to return to its original shape upon heating and subsequent cooling. A mechanical anchorage system was developed to apply pre-strained Fe-SMA plates to the steel girders of the 113 years old bridge, which is daily subjected to passengers and heavy vehicles. The SME in the Fe-SMA was then activated by heating to approximately 260 degrees C using heating ceramic pads. The test results showed that achieved recovery stress of the Fe-SMA strips led to a maximum compressive stress of -33 MPa in the lower flange of the steel girder. This compressive stress could significantly increase the yield and fatigue strength of the strengthened girder. Before and after the strengthening, the bridge was loaded with a 45.34-ton crane. Prior to installation of the strengthening to the bridge a static test was performed in the laboratory to examine the efficiency of the proposed strengthening method.

关键词： Shape memory alloy Shape memory effect Strengthening Historical steel bridge

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Influence of Barrier Shapes on Flutter Instability of a Streamlined Steel Box Girder 6th

Influence of Barrier Shapes on Flutter Instability of a Stre...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Van My Nguyen Hoang Nam Phan Quang Son Le Univ Danang Univ Sci & Technol Da Nang 550000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

This paper aims to focus on the flutter instability analysis of a streamlined steel box girder and investigate the influence of the barrier shape on this type of wind-induced instability of the girder. In particular, the steel box girder of the Thuan Phuoc suspension bridge in Da Nang city is selected as a case study. Based on a computational wind engineering approach, aerodynamic flutter derivatives of the girder cross-section are identified that allow calculating the critical flutter wind speed of the girder section. The results are then validated with experimental data available from the literature. Finally, a study on the influence of the barrier shape on flutter instability of the girder cross-section is presented considering three different barrier shapes, i.e., solid rectangular, porous rectangular, and curved shapes. Based on the analysis results, the optimal barrier shape respectively for each type is recommended to increase the aerodynamic stability of the examined box girder.

关键词： Barrier shape Flutter instability Streamlined box girder Flutter derivatives CFD simulation

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Evaluating the Influence of Soil Plasticity on the Vibratory Roller-Soil Interaction for Intelligent Compaction 4th

Evaluating the Influence of Soil Plasticity on the Vibratory...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Bhandari, Sangharsha Fatahi, Behzad Khabbaz, Hadi Lee, Jeffrey Xu, Zhengheng Zhong, Jinjiang Univ Technol Sydney UTS 15 Broadway Ultimo NSW 2007 Australia Australian Rd Res Board ARRB Brisbane Qld 4006 Australia Logan City Council Logan Cent Qld 4114 Australia

ISBN: (纸本)9783030772383;9783030772376

Use of intelligent compaction (IC) is a growing technique for compaction in the field of construction. It provides an efficient way of evaluating the soil compaction level with a higher degree of certainty than traditional quality control methods. IC involves the interpretation of measured values received through the accelerometer and other sensors attached to the roller. The key objective of this paper is to analyse the dynamic roller-soil interaction via a three-dimensional nonlinear finite element model, capturing soil nonlinear response and damping in both small and large strain ranges as a result of dynamic load applied via the vibratory roller. In particular, the impact of soil plasticity index (PI) on the response of a typical vibratory roller is assessed. Indeed, the soil plasticity impacts stiffness degradation with shear strain influencing the soil stiffness during compaction and the roller response. The numerical predictions exhibit that the soil plasticity can significantly influence the response of the roller and the ground settlement level;hence, practising engineers can consider the soil plasticity index as an influencing factor to interpret the intelligent compaction results and optimize the compaction process.

关键词： Intelligent compaction Soil plasticity Vibratory roller Finite element modelling Modulus degradation

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Attenuation Characteristics of Plane Waves by Metabarriers with Negative Parameters 4th

Attenuation Characteristics of Plane Waves by Metabarriers w...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Zhou, Jiahua Pu, Xingbo Shi, Zhifei Beijing Jiaotong Univ Sch Civil Engn Beijing 100044 Peoples R China Univ Bologna Dept Civil Chem Environm & Mat Engn DICAM I-40136 Bologna Italy

ISBN: (纸本)9783030772383;9783030772376

Metamaterials have come to the fore in the fields of electromagnetics and acoustics due to their superior performance in targeted frequency ranges. However, the related application such as in vibration mitigation in civil engineering is rare. In this paper, the dispersion relation of a new kind of metabarriers is obtained according to the theory of periodic structure in solid mechanics. The dispersion of the metabarriers is generated by local resonance. A simplified model is established to explain the mechanism of bandgaps. The effective mass density, effective shear modulus and effective bulk modulus of the metabarriers are calculated by finite element method. It is found that the resonance of the oscillator produces a negative effective mass density, which prevents the wave propagating in soil, thus creating bandgaps. At this point, the effective shear modulus and effective bulk modulus of the metabarriers are both positive. The findings of this paper are beneficial for the design of periodic pile barriers to isolate elastic waves propagating in soil.

关键词： Metabarriers Bandgap Effective parameters Vibration isolation

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Design and Mechanical Experiments on GFRP Frame Join by Bolted Connections 6th

Design and Mechanical Experiments on GFRP Frame Join by Bolt...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Helson, Olivier Ferrara, Guiseppe Michel, Laurent Ferrier, Emmanuel Univ Claude Bernard Lyon 1 Lab Mat Composites Construct LMC2 82 Bd Niels Bohr F-69622 Villeurbanne France

ISBN: (纸本)9789811671609;9789811671593

This research is part of MOOVABAT project aimed at designing a new technological building. In this context, experiments were carried out to assess the feasibility of using Fiber Reinforced Polymer (FRP) for moment-resisting frames. Research focuses on the mechanical behaviour of beam-to-column connections under monotonic and cyclic loading. Specifically highlighted was the need to better understand the mechanical behavior of bolted and screwed connections. Full-scale tests conducted in the laboratory was particularly focused on the beam-to-column connection. Both tested configurations include two T-shaped connections and one portal frame. Cyclic and monotonic tests are performed in order to assess the strength, the stiffness and the energy dissipated. The experimental results allowed to accurately characterize the semi-rigid connections measuring the real deformed shape of the structural frame. In addition, a deformed shape analysis explains why the failure occurs by brittle shearing of self-drilling screws. Finally, the test campaign allow the validation of engineering designs and it seems possible to consider optimization during the entire industrial production phase.

关键词： GFRP structure Sustainable structure Modular construction

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Numerical Validation of Hydrodynamic Responses and Mooring Top Tension of a Turret Moored FPSO Using Simulation and Experimental Results 5th

Numerical Validation of Hydrodynamic Responses and Mooring T...

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5th International Conference on Architecture and civil engineering 2021 (ICACE)

作者： Ja'e, I. A. Ali, M. O. A. Yenduri, A. Univ Teknol PETRONAS Dept Civil Engn Bandar Seri Iskandar 32610 Perak Malaysia TechnipFMC Global Engn Ctr Subsea Engn Chennai 600032 Tamil Nadu India

ISBN: (纸本)9789811686672;9789811686665

Numerically validated models are frequently used in the analysis of hydrodynamic responses and mooring line tensions of offshore floating platforms. This approach is very useful especially where access to laboratory facility is a challenge, or the limitation of available wave tank dimensions poses a great constraint to allow for proportionate scaling down of water depth. Thus, the numerical validation of a turret moored FPSO operating in a water depth of 1829 m is presented in this paper. The numerical model was developed in MAXSURF and perfected in Design-Modeler. Time-domain coupled analysis was conducted in ANSYS AQWA over a simulation period of 12000 sec using a time step of 0.02 sec. All AQWA model analysis results including static offset, free decay, platform response and line tensions compared reasonably well with the published simulation (WINPOST) and experimental (OTRC) results. The variation recorded in AQWA results might be due to non-uniformity in FPSO hull geometry, possible mismatch in the prediction of wind and current coefficients, and the non-inclusion of hull viscous effect in the numerical simulation. The mooring tension spectrum generally compares very well. The close agreement of the validated model with published results indicated proper modelling of the referenced FPSO platform. Hence, the validated model can be used as a benchmark for further studies concerning hydrodynamic responses, mooring line tension, and restoring behavior of a turret mooring system.

关键词： Turret FPSO Numerical models Validation Hydrodynamic responses Mooring line tension

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Seismic Response of Two-Bay Steel Multi-Tiered Concentrically Braced Frames 10th

Seismic Response of Two-Bay Steel Multi-Tiered Concentricall...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Comeau, Christophe Cano, Pablo Tremblay, Robert Imanpour, Ali Polytech Montreal Dept Civil Geol & Min Engn Struct Res Grp Montreal PQ Canada Univ Alberta Dept Civil & Environm Engn Edmonton AB Canada

ISBN: (纸本)9783031038136;9783031038112;9783031038105

This paper investigates the possibility of using multi-tiered concentrically braced frames in two adjacent column bays to resist seismic loads. Three prototype frames part of a single-storey building were chosen and designed using current knowledge of multi-tiered behaviour. The columns were selected to resist in-plane bending and axial loads arising from tensile yielding and compression buckling of braces in critical tiers. The lateral response of the frame was then examined using the nonlinear response history analyses under ground motion accelerations. The analyses confirmed that all frames exhibited nonuniform brace tensile yielding between tiers, which resulted in the concentration of inelastic drifts in the uppermost tiers. Peak storey drift values remained under 2.5%, although higher than the design predictions, which influenced the prediction of column in-plane bending.

关键词： Multi-tiered Multi-bay Steel Braced frame Seismic response

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BIM in Construction and Maintenance of Infrastructure Projects

BIM in Construction and Maintenance of Infrastructure Projec...

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International Conference on Advances in Construction Materials and Management (ACMM)

作者： Alasskar, Albaraa Jagannathan, P. SRM Inst Sci & Technol Chengalpattu 603203 Tamil Nadu India SRM Inst Sci & Technol Dept Civil Engn Chengalpattu 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

BIM is the latest technique, tool, methodology, and workflows in construction projects. Initially, the construction industry was using the BIM technology only for the construction of buildings, on knowing the advantages of this technology the Architecture, engineering, Construction, Operator and Owner (AECOO) industry around the world has started using it for vertical and horizontal projects. This paper discusses the adoption of BIM in the vertical building and the horizontal projects in construction and asset management in the life cycle of the structure. Usage of BIM helps the stakeholders from the planning stage to completion and during maintenance of the structure by providing high clarity to everyone involved in the project. The requirement of time as 4D and money as 5D for each stage of construction can be incorporated while modeling the structure. The specification of each item of the work in the structure can be incorporated in the model to refine the same in the future. The conditions of the structure in later time can be marked in the model to arrive at the suitable remedial measure and also BIM modeling helps to know the time periodical maintenance.

关键词： Building information modeling (BIM) 4D-BIM BIM in infrastructure Bridge information management Operation and maintenance

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Parametric Study of Slender Columns Retrofitted with NSM CFRP Rods 10th

Parametric Study of Slender Columns Retrofitted with NSM CFR...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Salgado, Rafael A. Parvin, Azadeh Univ Toledo 2801 W Bancroft St Toledo OH 43606 USA

ISBN: (纸本)9783030881665;9783030881658

Corrosion of steel bars in reinforced concrete (RC) due to environmental exposure results in service life and durability reduction and subsequent premature failure of structures. Columns are considered as critical components of a structure. Partial or full loss of columns' steel reinforcement due to corrosion can potentially lead to the collapse of the entire structure. An effective retrofit procedure is required to restore the performance of these damaged columns. The present numerical study investigates the use of near-surface mounted (NSM) CFRP rods as a retrofit technique for eccentrically loaded slender columns that partially or fully have lost their internal steel reinforcement due to corrosive environment. The proposed numerical model is corroborated with experimental results available in the literature. A parametric study was conducted to study the effectiveness of the NSM CFRP rods retrofitting to structurally compensate for the lost corroded steel reinforcement of as-built columns for ten different scenarios. The performance of retrofitted columns was assessed through axial load versus moment response plots. The results indicate that the NSM CFRP rods were able to regain the reduction in strength caused by the loss of internal steel reinforcement of damaged columns. Whereas in some scenarios, axial load and moment carrying capacities were increased.

关键词： FEA modelling FRP strengthening Eccentric loading Near-surface mounting Slender column

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