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Pilgrimage walk optimization: Folk culture-inspired algorithm for identification of bridge deterioration

Automation in construction 2023年第1期155卷

作者： Chou, Jui-Sheng Liu, Chi-Yun Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan

A discernible correlation emerged between global bridge disasters and bridge deterioration in recent years. To assist bridge inspectors in conducting deterioration identification, this paper presents a Pilgrimage Walk Optimization (PWO) algorithm inspired by Taiwan's unique Matsu bobee custom. The search behavior of the PWO algorithm simulates the gathering of devotees following Matsu's palanquin and their collective movements based on folk belief activities, including divination block casting, pilgrimage, the leisure ceremony, crawling beneath the palanquin, palanquin robbing, and the return palanquin ceremony. Analysis results show that the PWO outperformed contemporary metaheuristic algorithms on various multidimensional benchmark functions and was effectively applied to image segmentation for multiple types of bridge deterioration collected by an unmanned aerial vehicle. In the increasing number of engineering problems requiring edge computing to process big data, the proposed PWO algorithm is a low-cost and robust method with fault tolerance. © 2023

关键词： Optimization

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Study on Mechanical Properties of Steel Frame Structure with PEC Columns

Study on Mechanical Properties of Steel Frame Structure with...

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2023 International Conference on Applied Mathematics, Modelling and Statistics Application, AMMSA 2023

作者： Mao, Yongsheng Zhang, Zhuanna Yin, Zhanzhong Lanzhou Urban Construction Design and Research Institute Co. Gansu Lanzhou730000 China School of Civil Engineering Lanzhou University of Technology Gansu Lanzhou730050 China

PEC column has a wide prospect for strengthening existing steel structure buildings because of their high strength, stiffness, and bearing capacity. The seismic performance of the original steel structure could be significantly improved by filling the trough of section steel with concrete to form a partially encased composite column. Especially for multi-story buildings, the PEC column is an ideal edge restriction structural element, so it is of great significance to study its seismic performance. PEC column was introduced into steel frame structure, and six models of 8-story steel frame structures with PEC columns were established by using OpenSees finite element software. The displacement load curve, the maximum axial force in the column, the maximum bending moment at the column base, and the maximum inter-story shear force were obtained by Pushover analysis. The influence of concrete grade and the width-thickness ratio of the steel sheet of the PEC column on the mechanical properties of the whole structure was studied. Results show that lateral stiffness, ductility, and shear load-bearing capacity of the structure are improved with the addition of concrete in section steel, but ductility of the structure decreases with an increase of concrete strength grade. The influence of variation of PEC column parameters on the bottom of the structure is better than that on top. The width-thickness ratio of the section steel flange plays a major role in controlling the mechanical properties of the structure. The elastic stiffness of the structure, axial force of the column, and bending moment of the column base increase with the increase of flange thickness as section height is the same. An increase of the width-thickness ratio of the flange can improve the shear force of the story, and the lower the number of stories, the more significant the effect is. © 2023 Institute of Physics Publishing. All rights reserved.

关键词： Bearing capacity

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Evolution of cracks in the shear bands of granite residual soil

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Journal of Rock Mechanics and Geotechnical engineering 2022年第6期14卷 1956-1966页

作者： Chengsheng Li Lingwei Kong Ran An Department of Civil and Environmental Engineering Shantou UniversityShantou515063China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China College of Urban Construction Wuhan University of Science and TechnologyWuhan430065China

The evolution of shear bands and cracks plays an important role in ***,there is no systematic method for classification of the cracks,which can be used to analyze the evolution of cracks in shear *** this study,X-ray computed tomography(CT)is used to observe the behavior of granite residual soil during a triaxial shear *** on the digital volume correlation(DVC)method,a crack classification method is established according to the connectivity characteristics of cracks before and after *** are then divided into six classes:obsolete,brand-new,isolated,split,combined,and *** evolution of the shear bands,a large number of brand-new cracks accelerate the damages of materials at the mesoscale,resulting in a sharp decrease in *** volume of brandnew cracks increases rapidly with increasing axial strain,and their volume is greater than 50%when the strain reaches 12%,while the volume of compound cracks decreases from 54%to 21%.As cracks are the weakest areas in a material,brand-new cracks accelerate the development of shear ***,the coupling effect of shear bands and cracks destroys the soil strength.

关键词： Shear band Crack classification method Digital volume correlation(DVC) X-ray computed tomography(CT) Granite residual soil

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Investigation on Rectangular Tunnel Mechanical Response Under Groundwater Level Fluctuation Based on Model Test and Numerical Simulation 18th

Investigation on Rectangular Tunnel Mechanical Response Unde...

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18th Conference of the Associated Research Centers for the Urban Underground Space, ACUUS 2023

作者： Sun, Weixin Liu, Hanlong Zhang, Wengang Li, Yongqin Liu, Songlin School of Civil Engineering Chongqing University Chongqing400045 China Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University Chongqing400045 China National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas Chongqing University Chongqing400045 China

ISBN: (纸本)9789819712564

Groundwater is a critical determinant significantly affecting the stability of underground tunnels. Despite its importance, research remains limited on the influence of groundwater level fluctuations on the behavior of rectangular tunnels. This paper addresses this knowledge gap by thoroughly examining the response mechanism of rectangular tunnels subjected to groundwater level fluctuations, utilizing a combination of scale model tests and numerical simulations. The study emphasizes the analysis of the effects of varying buried depth ratios and speeds of groundwater level fluctuations on the performance of rectangular tunnels. Findings indicate that changes in groundwater levels result in the vertical displacement of the tunnel and instigate deformations in the surrounding soil. Moreover, alterations in hydraulic conditions considerably shift the stress and strain distribution within the tunnel, with stress concentration becoming increasingly evident as the tunnel’s buried depth ratio and the speed of groundwater level fluctuations increase. The insights derived from this study offer valuable contributions for future research efforts and engineering design in the domain of rectangular tunnel stability under fluctuating groundwater conditions. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Stress concentration

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Research progress and application of deep in-situ condition preserved coring and testing

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International Journal of Mining Science and technology 2023年第11期33卷 1319-1337页

作者： Heping Xie Yunqi Hu Mingzhong Gao Ling Chen Ru Zhang Tao Liu Feng Gao Hongwei Zhou Xiaobo Peng Xiongjun Li Jianbo Zhu Cunbao Li Ruidong Peng Yanan Gao Cong Li Jianan Li Zhiqiang He State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Health Operation and Maintenance of Deep Earth Engineering Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and UtilizationInstitute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065China Frontier Science Research Center for Fluidized Mining of Deep Underground Resources China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China

With the depletion of shallow resources,the exploration of deep earth resources has become a global *** study of the different patterns in the physical mechanical properties of rocks at different occurrence depths is the basis for exploring deep into the earth,with the core and premise being the acquisition and testing of deep in-situ core *** on the original idea of deep in-situ condition preserved coring(ICP-Coring)and testing,combined with theoretical modeling,numerical analysis,test platform development,indoor testing and engineering application,the principles and technologies of deep ICP-Coring are *** principle and technology consists of five parts:in-situ pressurepreserved coring(IPP-Coring),in-situ substance-preserved coring(ISP-Coring),in-situ temperaturepreserved coring(ITP-Coring),in-situ light-preserved coring(ILP-Coring),and in-situ moisturepreserved coring(IMP-Coring).The theory and technology of temperature and pressure reconstruction at different occurrence depths and in different environments are proposed,and prototype trial production was completed by following the principle of displacement and tests based on the in-situ reconstructed *** notable advances are as follows:(1)Deep in-situ coring system:A pressure-preserved controller with an ultimate bearing capacity greater than 140 MPa,highperformance(temperature-resistant,pressure-resistant,and low thermally conductive)temperaturepreserved materials,an active temperature control system,and high-barrier quality-preserved membrane materials were developed;a deep ICP-Coring capacity calibration platform was independently developed,a deep in-situ coring technology system was developed,and the acquisition of deep in-situ cores was realized.(2)In-situ storage displacement system:Following the dual-circuit hydraulic design idea,a single-drive source push-pull composite grabbing mechanism was designed;the design of the overall structure for the deep in-situ displ

关键词： Deep mining Deep in-situ Coring Displacement Test

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The Influence of Buried Depth on the Stress Mode of Independent Foundation in Rock Foundation 6th

The Influence of Buried Depth on the Stress Mode of Independ...

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6th International Conference on civil engineering, ICOCE 2022

作者： Dong, Yunpeng Ke, Yin College of Civil Engineering Chongqing University Chongqing400045 China Key Laboratory of New Technology for Construction of Cities in Mountain Area of Ministry of Education Chongqing University Chongqing China

ISBN: (纸本)9789811939822

Reinforced concrete independent foundation has the advantages of simple structure, low economic cost and convenient design. In order to study the influence of buried depth on the stress mode of independent foundation in rock foundation, the stress and deformation characteristics of independent foundation in rock foundation under buried depth are analyzed through theoretical discussion and numerical simulation, and the differences of reaction force and internal stress field of foundation under different constraints are compared. The results show that the independent foundation is actually a stress model between the deep beam and the compression member under the constraints of the bottom and side walls;In addition, when the independent foundation is under different constraints, the mechanical properties are different, so the influence of various constraints on the independent foundation should be considered in the design. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Foundations

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Combined Effect of External Aggressive Factors on Road Concrete Properties

Combined Effect of External Aggressive Factors on Road Concr...

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2022 International Conference on engineering Management of Communication and technology, EMCTECH 2022

作者： Kovaleva, Anna Sidorova, Anastasia Pukharenko, Yuriy Aubakirova, Irina Saint Petersburg State University of Architecture and Civil Engineering Department of Technology of Construction Materials and Metrology Saint Petersburg Russia

ISBN: (数字)9798350397680

ISBN: (纸本)9798350397680

The durability of pavements in real operation is characterized by their resistance to various kinds of external aggressive influences. At the same time, the approach to assessing the properties of operational reliability using standard methods, in accordance with which tests are carried out not in a complex, but separately, is fundamentally wrong. The results obtained will be veiled and will not reflect the actual dynamics of the processes of destruction of the roadway in real operating conditions. Based on this, an experiment was set up in the work, the purpose of which is to study the cumulative effect of temperature fluctuations, humidity, as well as freeze and thaw cycles on the main properties of road concrete operated in the cold maritime climatic conditions. It has been established that the impact of alternating drying and moistening on cement concrete samples at an early age significantly reduces the indicators of frost resistance, abrasion, water absorption and bending strength, which ultimately will lead to the destruction of the roadway and a significant reduction in the intermaintenance period. The results obtained indicate the need to change approaches to assessing the properties of cement concrete, taking into account operating conditions © 2022 IEEE.

关键词： Durability

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Super broadband absorbing hierarchical CoFe alloy/porous carbon@carbon nanotubes nanocomposites derived from metal-organic frameworks

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Journal of Materials Science & technology 2022年第23期118卷 218-228页

作者： Siyao Guo Yunfeng Bao Ying Li Hailong Guan Dongyi Lei Tiejun Zhao Baomin Zhong Zhihong Li School of Civil Engineering Qingdao University of TechnologyQingdao 266033China Postdoctoral Workstation Guangdong Dongpeng Holding Company LimitedGuangdong 528031China Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone Qingdao University of TechnologyQingdao 266033China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in special Environments Harbin Institute of TechnologyHarbin 150080China

The exploitation of electromagnetic wave absorption(EMA) materials has attracted ever-increasing attention,not only because electromagnetic wave(EMW) originated from overuse of electronic products has threatened human' health seriously,but also because EMA materials can effectively protect radar stealth from being ***,it is still a challenge to obtain broadband and efficient EMA materials to satisfy practical *** this work,we developed a series of hierarchical CoFe alloy/porous carbon@carbon nanotubes(CoFe/PC@CNTs) nanocomposites through revising the proportion of Fe^(2+) in the metal-organic frameworks(MOFs)(CoFe-ZIF) precursor and one-step simple pyrolysis *** cross deposition between CoFe alloy,carbon nanotubes(CNTs),and porous carbon(PC) formed a double conductive network,favoring for achieving excellent EMA ***,when the filler mass ratio is only 10 wt%,the optimized CoFe/PC@CNTs nanocomposites display the best EMA capability,whose minimum reflection loss(RL_(min)) value is-68.94 dB at 13.69 GHz and the effective absorption band(EAB,<-10 dB) reaches up 9.14 GHz with a matching thickness of 2.63 *** addition,the largest EAB can achieve up to 11 GHz(3.35-14.35 GHz) during all matching *** splendid EMA performance benefits the favorable dielectric loss provided by the double conductive network,the good magnetic loss benefited from the evenly distributed CoFe alloy,the excellent impedance matching,rich transmission paths,and multiple ***,such EMA materials with super broadband absorbing provide desirable candidates for lightweight and high-efficient microwave absorbers.

关键词： Electromagnetic wave absorption CoFe alloy/porous carbon@carbon nanotubes nanocomposites Broadband absorbing Metal-organic frameworks

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Optimal design of urban drainage system based on GIS and machine learning 2

Optimal design of urban drainage system based on GIS and mac...

引用

2nd IEEE International Conference on Electrical, Automation and Computer engineering, ICEACE 2024

作者： Meng, Di Zhang, Yunfeng East University of Heilongjiang College of Civil Engineering and Architecture Harbin150000 China Harbin Water Development and Construction Group Emergency Rescue and Non-Excavation Technology Application Center in Cold Regions Harbin150000 China

ISBN: (纸本)9798350368208

How to optimize multi-objective drainage efficiently and accurately is a key problem in urban drainage. In response to this problem, in this paper, a novel method combining geographic information System (GIS), Random Forest Regression (RFR) and Multi-Objective Optimization is proposed. Multi-Objective Forest Regression (MOFR) method provides detailed spatial data and terrain information through GIS, and RFR realizes high-precision prediction of urban drainage system performance, and uses MOO for multi-objective optimization, so as to ensure high prediction accuracy and improve the comprehensive performance of the system. Ultimately, experimental results, obtained through comparative experiments and analysis with traditional machine learning methods, demonstrate that the MOFR method exhibits notable advantages in enhancing prediction accuracy, minimizing function errors, and optimizing water quantity testing. Especially in complex multi-objective optimization scenarios, MOFR method can more accurately find the optimal design scheme and reduce the uncertainty in the decision-making process. This fully verifies the reliability and effectiveness of the architecture in urban drainage system optimization design. © 2024 IEEE.

关键词： Adversarial machine learning

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Stress State and Several Problems of Estimating the Actual Operation of Effective Bridge Superstructures 5th

Stress State and Several Problems of Estimating the Actual O...

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5th International Scientific Conference on Environmental Challenges in civil engineering, ECCE 2022

作者： Shymanovskyi, Oleksandr Shalinskyi, Valerij Shymanovska, Maryna Baran, Wieslaw V. Shymanovskyi Ukrainian Institute of Steel Construction Kyiv Ukraine Faculty of Civil Engineering and Architecture Opole University of Technology Katowicka 48 Opole45-061 Poland

ISBN: (纸本)9783031268786

The paper presents the results of investigating the under-load behaviour and some estimates of the mutual influence of the stress state of structural elements during the actual operation of effective bridge superstructures with orthotropic deck plates. A brief description of the design solution of orthotropic deck plates is presented. It is stated that, from a structural point of view, significant saving of steel in the case of orthotropic deck plates is due to the fact that the longitudinal stiffeners and decking of such plate are included in joint work with the main girders and, thus, are included in the upper flange cross section. Therefore, the normal stresses in the plate near the webs are always greater than at any distance from them. Estimating this irregularity is very important for determining the actual operating conditions of the orthotropic deck as a whole and is carried out in each case by performing calculations of the superstructure. The results of calculating the real bridge deck of the carriageway at the Dnieper Hydroelectric Power Station dam in Zaporozhye are described. Relevant recommendations are provided. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Bridge decks

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