ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3167

Fan Xing

引用次数: 0

Analysis of Monitoring Priorities for Long-Span Suspension Bridges in Complex Environments 复杂环境下大跨度悬索桥监测重点分析

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3241

Zhiqiang Yi, Qi Zhang, Xiaomin Huang, Aihua Xu, Shufen Ning, Qing Shen, Xinglun Ru, Yunlong Liu, Yunpeng Liu

{"title":"Analysis of Monitoring Priorities for Long-Span Suspension Bridges in Complex Environments","authors":"Zhiqiang Yi, Qi Zhang, Xiaomin Huang, Aihua Xu, Shufen Ning, Qing Shen, Xinglun Ru, Yunlong Liu, Yunpeng Liu","doi":"10.1002/cepa.3241","DOIUrl":"https://doi.org/10.1002/cepa.3241","url":null,"abstract":"Structural Health Monitoring (SHM) systems for mega-bridges play a critical role in modal identification, damage detection, and safety assessment, providing essential information for decision-making. Despite significant advancements in SHM technology for mega-bridges, monitoring these structures in highly complex environments still requires continuous improvement. For the Moon Bay Bridge, which exists in a particularly complex environment, two primary monitoring focuses have been identified: real-time GNSS monitoring for the high-intensity canyon suspension bridge and the impact of temperature variations on structural responses and sensor performance. The analysis focuses on structural responses such as the displacement at the top of the pylon, elevation changes, and anchor displacements to obtain comprehensive deformation information. The research results indicate that in the GNSS monitoring data, the displacement at the top of the pylon on the Yunnan side and the displacement of the upstream and downstream anchors on the Yunnan side were relatively stable, while the vertical elevation changes fluctuated significantly. This fluctuation is attributed to the settlement of the tunnel-anchored structure caused by the advance excavation of the tunnel, with minimal disturbance to the anchor plug from subsequent tunneling. Temperature has a minor impact on the horizontal and vertical angles at the beam ends but significantly affects the longitudinal displacement and bearing displacement at the beam ends. Temperature changes greatly influence the cable forces of the end suspender cables, while the impact on other suspender cables is minimal. To minimize the interference of complex environmental factors on monitoring results, enhance data accuracy and reliability, and ensure the stability and safety of the bridge, special attention must be given to the effect of temperature changes on the end suspender cables.","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1563-1579"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis and performance of polycarboxylate superplasticizer with ester monomers 酯类聚羧酸酯型高效减水剂的合成与性能研究

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3101

Wenhong Chen, Lei Deng, Yu Jiang, Bo Zhang, Die Yang

引用次数: 0

Research on the mix proportion design and mechanical properties of C60 hybrid fiber-reinforced high-strength concrete C60混杂纤维增强高强混凝土配合比设计及力学性能研究

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3102

YanChang Zhu, Changlei Bu, Yanmei Zhang

{"title":"Research on the mix proportion design and mechanical properties of C60 hybrid fiber-reinforced high-strength concrete","authors":"YanChang Zhu, Changlei Bu, Yanmei Zhang","doi":"10.1002/cepa.3102","DOIUrl":"https://doi.org/10.1002/cepa.3102","url":null,"abstract":"Based on the actual engineering requirements of a specific metro project, this paper develops a mix proportion design for C60 hybrid fiber-reinforced high-strength concrete. Through compressive strength tests, splitting tensile strength tests, and scanning electron microscopy analysis, the study explores the effects of fiber parameters on the mechanical properties of the concrete and analyzes the underlying mechanisms. Results of the experimental study indicate that the mechanical properties of the C60 hybrid fiber-reinforced high-strength concrete are optimal when the steel fiber dosage is 40 kg/m3, the polypropylene fiber dosage is 1 kg/m3, and the length of the polypropylene fibers is 18 mm. Both types of fibers will reduce the compressive strength of the concrete but enhance its splitting tensile strength. Specifically, the compressive strength of the concrete de-creases gradually with the increase of steel fiber dosage. In contrast, the effect of polypropylene fiber dosage on compressive strength shows an initial increase followed by a decrease. The increase in the dosage of both fibers and the length of the polypropylene fibers enhances the splitting tensile strength of the concrete. Polypropylene fibers make the concrete more “flexible,” and steel fibers do not effectively restrain the lateral deformation of the concrete, leading to a reduction in compressive strength. However, combining both fibers with other admixtures forms a framework that transfers tensile stress, and delays crack propagation and concentration, thereby enhancing the ultimate tensile stress of the composite matrix.","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"66-81"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Field Study on One-time Pile Construction Method of Helix Stiffened Cement Mixing Piles 螺旋加筋水泥搅拌桩一次性施工方法的现场研究

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3215

Xiangjun Lin, Kui Zhang, Hao Chen, Zhenqin Zhang, Hao Qi

{"title":"Field Study on One-time Pile Construction Method of Helix Stiffened Cement Mixing Piles","authors":"Xiangjun Lin, Kui Zhang, Hao Chen, Zhenqin Zhang, Hao Qi","doi":"10.1002/cepa.3215","DOIUrl":"https://doi.org/10.1002/cepa.3215","url":null,"abstract":"The Helix Stiffened Cement Mixing (HSCM) pile is a new type of composite pile. In order to investigate the effects of construction machinery and the one-time pile construction process on the axial bearing performance of HSCM piles, field pile driving tests and axial loading tests were carried out. The pile diameter and bearing deformation characteristics of helical piles, hollow bar micropiles, and HSCM piles were compared and analyzed. The enhancement effect of the one-time pile construction process on the frictional resistance of HSCM piles was discussed. The load transfer mechanism of HSCM piles under different load levels during one-time pile construction was revealed. The test results showed that the one-time pile construction process could form a cement-soil column around the pile core, and an appro-priate increase in the helix plates was beneficial to forming the cement-soil column. When applied in marine soft clay, the bond diameter of HSCM piles could be conservatively estimated to equal the diameter of the helix plates. The axial bearing capacity of HSCM piles is about twice that of helical piles. The one-time pile construction process increased the pile-soil contact area and improved the axial bearing capacity. During loading, the load of HSCM piles was transferred from the helical pile core to the ce-ment-soil and further to the pile-soil contact surface, and its load transfer mechanism was the failure of the pile-soil contact surface.","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1282-1294"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on Fatigue Residual Bearing Capacity of Prestressed Concrete Beams Considering Size Effect 考虑尺寸效应的预应力混凝土梁疲劳剩余承载力研究

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3121

Hongyu Zhou, Shuai Han, Yanan Liu, Haoda Wang

引用次数: 0

Construction Analysis and Monitoring of Complex Prestressed Steel Structure 复杂预应力钢结构施工分析与监测

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3225

Xianrui Song

{"title":"Construction Analysis and Monitoring of Complex Prestressed Steel Structure","authors":"Xianrui Song","doi":"10.1002/cepa.3225","DOIUrl":"https://doi.org/10.1002/cepa.3225","url":null,"abstract":"The emergence of large and complex prestressed structures has become an inevitable trend with the progress of society and technology. However, these structures are susceptible to higher probabilities of safety incidents during construction due to various influencing factors. Hence, structural monitoring is imperative to ensure smooth construction progress and safe structural utilization. This study investigated the construction process of complex prestressed steel structure on the basis of the west watchtower of Yingtian Gate site protection exhibition project. The upper structure of the west watchtower is supported by inclined columns. Under the action of structural dead weight and construction load, a large horizontal thrust is generated at the column foot. Prestressed foundation beams are installed between the pile caps to balance the horizontal component of the upper structure because of the limited horizontal bearing capacity of pile foundation. Construction monitoring of the west watchtower was conducted through numerical analysis to ensure that measured horizontal displacement of pile caps is small, and the pile is in a safe state. The inclined column and the prestressed foundation beam, moreover, are within the limits. The prestressed construction of the west watchtower was successfully completed under rigorous numerical analysis and precise construction monitoring.","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1386-1394"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143645837","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Safety Analysis on External Water Pressure to the Deep Buried Hydraulic Tunnel Lining Based on Coupling Numerical Simulation 基于耦合数值模拟的深埋水工隧洞衬砌外水压安全性分析

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3245

Yang Wang, Ran Xu

引用次数: 0

Weight Correction of Bridge Substructure in Underwater Environment Based on Analytic Hierarchy Process 基于层次分析法的水下桥梁下部结构重量校正

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3244

Bing Wang, Cheng-Long Zhu, Yu-Peng Li, Hong-Hao Li, Yu Zhu, Fei Liu

引用次数: 0

Research on Safety Evaluation of Water Diversion Tunnel Based on the Fusion of Monitoring and Detection Information 基于监测与检测信息融合的引水隧洞安全评价研究

ce/papers Pub Date : 2025-03-18 DOI: 10.1002/cepa.3272

ZhiJian Wei, Qiang Nie, ChangQing He, QianDe Li, Jie Ren, Yuan Wang

{"title":"Research on Safety Evaluation of Water Diversion Tunnel Based on the Fusion of Monitoring and Detection Information","authors":"ZhiJian Wei, Qiang Nie, ChangQing He, QianDe Li, Jie Ren, Yuan Wang","doi":"10.1002/cepa.3272","DOIUrl":"https://doi.org/10.1002/cepa.3272","url":null,"abstract":"The safety evaluation of operating water transfer tunnels lacks sufficient research, particularly in integrating safety monitoring and detection information for a comprehensive assessment. Therefore, this paper proposes a method for safety assessment of water transfer tunnels by integrating monitoring and detection information based on evidence theory. The method involves establishing an evaluation index system for safety monitoring and detection of water transfer tunnels. It utilizes a basic probability assignment construction method based on equal interval numbers and an improved Analytic Hierarchy Process to obtain the basic probability assignments of monitoring and detection information. The weights of the information for water transfer tunnels are determined using the AHP, and the monitoring and detection information from various sources are integrated using the synthesis rule of evidence theory. The fusion results show that the proposed method effectively addresses the uncertainty of safety monitoring and detection information, resulting in more comprehensive safety evaluation outcomes.","PeriodicalId":100223,"journal":{"name":"ce/papers","volume":"8 2","pages":"1873-1898"},"PeriodicalIF":0.0,"publicationDate":"2025-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143646057","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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