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Experimental Study on Characteristics of Filter Cake Formation in Slurry Shield Tunnelling Based on “Cutter-Soil” Interaction 基于 "刀具-土壤 "相互作用的泥浆护盾掘进中滤饼形成特征的实验研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-07 DOI: 10.1007/s12205-024-0189-2
Yang Bai, Yapeng Li, Lei Li

In recent years, more and more river-crossing and sea-crossing underwater tunnels have become the first choice for the construction of large channels in regions with developed river system. Relying on its superior pressure control mode and high security, Slurry Pressure Balance shield (SPB) is widely used in the construction of underwater tunnels with large cross-sections. The filter cake is an important medium to guarantee the stability of the excavation in SPB tunnelling. However, the mechanism of cutter on soil and filter cake (the interaction of “cutter-soil”) are still unclear. In this study, a self-made test apparatus based on the interaction of “cutter-soil” is presented. The experiment results revealed that “cutter-soil” interaction, compared to cases without the interaction, reduced the impermeability and effective stress conversion rate of filter cake, which is unfavorable to guarantee the stability of the tunnel face. To overcome this problem, two methods were proposed: continuous injection of slurry with different densities and increasing the coarse particles of slurry. It is shown that the methods have improved filter the impermeability of cake formation, which contributes to the stability of the shield excavation face.

近年来,越来越多的过江、过海水下隧道成为河流水系发达地区大型渠道建设的首选。泥浆压力平衡盾构机(SPB)凭借其优越的压力控制方式和较高的安全性,在大断面水下隧道施工中得到了广泛应用。滤饼是保证 SPB 隧道开挖稳定性的重要介质。然而,铣挖机对土壤和滤饼的作用机理("铣挖机-土壤 "相互作用)尚不清楚。本研究提出了一种基于 "铣挖机-土 "相互作用的自制试验装置。试验结果表明,"刀-土 "相互作用与无相互作用的情况相比,降低了滤饼的抗渗性和有效应力转换率,不利于保证隧道工作面的稳定性。为克服这一问题,提出了两种方法:连续注入不同密度的泥浆和增加泥浆的粗颗粒。结果表明,这两种方法都改善了滤饼形成的抗渗性,有助于盾构开挖面的稳定性。
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引用次数: 0
Automated Geotechnical Information Extraction from Construction Boring Logs Using Keyword Groups 使用关键字组从施工钻孔记录中自动提取岩土工程信息
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-07 DOI: 10.1007/s12205-024-0605-7
Byeong-Soo Yoo, Jin-Tae Han, Eomzi Yang

Geotechnical survey data is essential for the construction of civil engineering and architectural structures, with high utilization rates. However, variations in the forms used across different entities such as host organizations, contractors, and structures necessitate manual input tasks during the database creation process, leading to significant consumption of human and time resources. To address this challenge, both standard and distributed boring logs were collected and subjected to comprehensive feature analysis. Based on this analysis, an algorithm capable of automatically extracting the desired geotechnical information from boring logs was developed. This algorithm is versatile, applicable across various formats, and has demonstrated a staggering improvement in information processing speed compared to manual input.

岩土工程勘测数据对土木工程和建筑结构的建设至关重要,其利用率很高。然而,由于主机组织、承包商和结构等不同实体所使用的表格存在差异,因此在数据库创建过程中必须进行手动输入,从而导致大量人力和时间资源的消耗。为了应对这一挑战,我们收集了标准和分布式枯燥日志,并对其进行了全面的特征分析。在此分析的基础上,开发了一种能够从钻孔记录中自动提取所需岩土工程信息的算法。该算法用途广泛,适用于各种格式,与人工输入相比,信息处理速度有了惊人的提高。
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引用次数: 0
Effect of Origin on Chemical Extractability of Fluorine in Soil and Its Consequence on Human Health Risk 产地对土壤中氟的化学萃取性的影响及其对人类健康风险的影响
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-07 DOI: 10.1007/s12205-024-0454-4
Changwon Chae, Soobean Park, Sang-Gyu Yoon, Jinsung An

Exposure to fluorine (F) in soil increases the risks of dental and skeletal fluorosis and osteoporosis. Therefore, it is important to accurately determine the soil F concentration, and quantitatively evaluate the factors that affect the human health risk of soil F. Differences in soil F concentrations were investigated based on source type (anthropogenically contaminated or naturally enriched) and determination method (perchloric acid extraction-distillation (PAED) or alkali fusion-filtration). A soil sample without contamination history (background F concentration = 208 mg·kg−1) was collected and injected with sodium fluoride (NaF) to prepare anthropogenically F-contaminated soil. Mica gravel (> 2 mm) was ground and mixed with quartz powder to mimic soil components of natural F origin. The F concentration in anthropogenically contaminated soil did not significantly differ between methods (slope = 0.959, p > 0.05). The concentration in the naturally F-enriched soil analyzed using alkali fusion-filtration was approximately twice that of the sample analyzed using PAED (slope = 0.548, p < 0.05). This significant difference was ascribed to the abundance of chemically stable F. Non-carcinogenic hazard quotients for children differed between methods in naturally F-enriched soil, at 1.335 (alkali fusion-filtration) and 0.641 (PAED). These findings offer valuable insights for assessing, managing, and remediating soils contaminated or enriched with F.

接触土壤中的氟(F)会增加罹患氟斑牙、氟骨症和骨质疏松症的风险。因此,准确测定土壤中氟的浓度并定量评估影响土壤氟对人体健康风险的因素非常重要。研究人员根据来源类型(人为污染或天然富集)和测定方法(高氯酸萃取-蒸馏(PAED)或碱熔-过滤)调查了土壤中氟浓度的差异。采集无污染历史的土壤样本(本底 F 浓度 = 208 mg-kg-1)并注入氟化钠 (NaF),制备人为 F 污染土壤。云母砾石(> 2 毫米)经研磨后与石英粉混合,以模拟天然氟来源的土壤成分。人为污染土壤中的 F 浓度在不同方法之间没有显著差异(斜率 = 0.959,p > 0.05)。采用碱熔过滤法分析的天然富钙质土壤中的钙浓度约为采用 PAED 分析的样本的两倍(斜率 = 0.548,p <0.05)。在富含膳食纤维的天然土壤中,不同方法得出的儿童非致癌危害商数也不同,分别为 1.335(碱熔过滤法)和 0.641(PAED)。这些发现为评估、管理和修复受 F 污染或富集的土壤提供了宝贵的见解。
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引用次数: 0
Static Load Testing with Elastic Cushion Layer: A Case Study in Foshan Highway Project 带弹性缓冲层的静载荷测试:佛山高速公路项目案例研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-07 DOI: 10.1007/s12205-024-0159-8
Yunlong Yao, Xin Liu, Fenqiang Xu, Zhiwei Shao, Guisen Wang, Baoning Hong

To address limitations in conventional static load tests for composite foundations, a method utilizing an elastic cushion layer is proposed to accurately simulate subgrade behavior, focusing on a highway project in Guangdong Province. Initial finite element calculations justify the elastic cushion layer introduction. Functional correlations are established between the stab deformation of the piles and the thickness, modulus and the pile-soil stress ratio. The reasonable value of the elastic modulus is taken as 4–10 MPa when the elastic cushion layer thickness is 60 mm. Lab and field tests of cement fly-ash gravel (CFG) pile composite foundations assess settlement variations and pile-soil stress ratios from the proposed improvements. Results reveal the superior performance of the elastic cushion layer over the sand cushion layer, effectively mimicking embankment subgrade layers and reducing rigid constraints on the loading plate. The elastic cushion layer exhibits a significant stress-regulating effect, allowing the transition from the original “100–150 mm sand cushion layer + loading plate” to “less than 100 mm sand cushion layer + 60 mm elastic cushion layer (8 MPa) + loading plate”. This adjustment enhances the practical role of the subgrade in the composite foundation, improving the accuracy and feasibility of static load testing methods.

针对复合地基传统静载荷试验的局限性,我们提出了一种利用弹性垫层来精确模拟路基行为的方法,并将重点放在广东省的一个高速公路项目上。初步的有限元计算证明了引入弹性缓冲层的合理性。建立了桩的稳定变形与厚度、模量和桩土应力比之间的函数关系。当弹性垫层厚度为 60 毫米时,弹性模量的合理值为 4-10 兆帕。对水泥粉煤灰砾石(CFG)桩复合地基进行的实验室和现场测试评估了建议改进后的沉降变化和桩土应力比。结果表明,弹性垫层的性能优于砂垫层,能有效模拟路堤基层,减少对加载板的刚性约束。弹性垫层具有显著的应力调节作用,可从原来的 "100-150 毫米砂垫层+加载板 "过渡到 "小于 100 毫米砂垫层+60 毫米弹性垫层(8 兆帕)+加载板"。这一调整增强了基层在复合地基中的实际作用,提高了静载荷试验方法的准确性和可行性。
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引用次数: 0
Predicting Hydrological Drought Conditions of Boryeong Dam Inflow Using Climate Variability in South Korea 利用气候变异性预测韩国宝岭大坝下泄流量的水文干旱状况
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-07 DOI: 10.1007/s12205-024-0160-2
Seonhui Noh, Micah Lourdes Felix, Seungchan Oh, Kwansue Jung

When a hydrological drought occurs due to a decrease in water storage, there is no choice but to supply limited water. Because this has a devastating impact on the community, it is necessary to identify causes and make predictions for emergency planning. The state of change in dam inflow can be used to confirm hydrological drought conditions using the Standardized Runoff Index (SRI), and meteorological drought and climate variability are used to identify causal relationships. Multiple Linear Regression (MLR) and Generalized Additive Model (GAM) models are developed to predict accumulated hydrological drought for 6, 12, and 24 months in the Boryeong Dam basin, and the Nash-Sutcliffe model efficiency coefficient (NSE) exceeded 0.4, satisfying the suitability criteria. The estimation ability is highest when predicting a 12-month annual drought, and reliability can be further increased by reflecting some climate fluctuations in a non-linear form. The droughts of 6 month and 24 month cumulative scales are significantly influenced by the Western Hemisphere Warm Pool (WHWP) extending from the eastern North Pacific to the North Atlantic and by the Nino 3.4 region in the tropical Pacific. Furthermore, it is anticipated that the drought conditions of the inflow volume to the Boryeong Dam will worsen with increasing sea surface temperatures in both regions.

当蓄水量减少导致水文干旱时,别无选择,只能有限供水。由于这会对社区造成破坏性影响,因此有必要查明原因并进行预测,以便制定应急计划。可利用标准化径流指数 (SRI) 来确认水文干旱状况,并利用气象干旱和气候多变性来确定因果关系。建立了多元线性回归 (MLR) 模型和广义加性模型 (GAM) 模型来预测宝岭坝流域 6、12 和 24 个月的累积水文干旱,纳什-苏特克利夫模型效率系数 (NSE) 超过 0.4,满足适宜性标准。在预测 12 个月的年度干旱时,估算能力最高,通过以非线性形式反映某些气候波动,可靠性可进一步提高。6 个月和 24 个月累积尺度的干旱受到从北太平洋东部延伸到北大西洋的西半球暖池(WHWP)和热带太平洋尼诺 3.4 区域的显著影响。此外,随着这两个区域海面温度的上升,预计宝岭大坝入流水量的干旱状况将进一步恶化。
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引用次数: 0
Research on Adaptability of CS and BT Hobs to Break Soft and Hard Rock CS 和 BT 滚刀破碎软硬岩石的适应性研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-06 DOI: 10.1007/s12205-024-2753-1
Xuhui Zhang, Kang Long, TaoTan, Yashi Liao, Jianfang Li, Jingping Liao

To study the breaking differences between CS hob and BT hob under hard rock (rust rock) and soft rock (red sandstone), and reveal their adaptability in the two rock formations, the vertical breaking experiments of two hobs are conducted. Then, the rock breaking load, rock breaking difficulty coefficient, and rock breaking efficiency of the two hobs in different hob spacings are analyzed and discussed. The result denotes that the CS hob has a greater rock breaking load and rock breaking difficulty compared to the BT hob. Meanwhile, when the breaking object changes from hard rock (rust rock) to soft rock (red sandstone), both types of hobs’ rock breaking loads decrease, but the CS hob’s decrease is significantly greater than the BT hob’s. Meanwhile, the optimal hob spacing for the CS hob increases from 40 mm to 50 mm, whereas for the BT hob, it remains at 30 mm. Considering the rock breaking load and rock breaking efficiency of the hobs together, the CS hob is found to be more suitable for soft rock formation, while the BT hob is more suitable for hard rock formation.

为了研究 CS 滚刀和 BT 滚刀在硬岩(铁锈岩)和软岩(红砂岩)下的破岩差异,揭示其在两种岩层中的适应性,进行了两种滚刀的垂直破岩实验。然后,对不同滚刀间距下两种滚刀的破岩载荷、破岩难度系数和破岩效率进行了分析和讨论。结果表明,与 BT 滚刀相比,CS 滚刀具有更大的破岩载荷和破岩难度。同时,当破碎对象从硬岩(锈岩)变为软岩(红砂岩)时,两种滚刀的破岩负荷都会下降,但 CS 滚刀的下降幅度明显大于 BT 滚刀。同时,CS 滚刀的最佳滚刀间距从 40 毫米增加到 50 毫米,而 BT 滚刀的最佳滚刀间距仍为 30 毫米。综合考虑滚刀的破岩载荷和破岩效率,CS 滚刀更适用于软岩地层,而 BT 滚刀更适用于硬岩地层。
{"title":"Research on Adaptability of CS and BT Hobs to Break Soft and Hard Rock","authors":"Xuhui Zhang, Kang Long, TaoTan, Yashi Liao, Jianfang Li, Jingping Liao","doi":"10.1007/s12205-024-2753-1","DOIUrl":"https://doi.org/10.1007/s12205-024-2753-1","url":null,"abstract":"<p>To study the breaking differences between CS hob and BT hob under hard rock (rust rock) and soft rock (red sandstone), and reveal their adaptability in the two rock formations, the vertical breaking experiments of two hobs are conducted. Then, the rock breaking load, rock breaking difficulty coefficient, and rock breaking efficiency of the two hobs in different hob spacings are analyzed and discussed. The result denotes that the CS hob has a greater rock breaking load and rock breaking difficulty compared to the BT hob. Meanwhile, when the breaking object changes from hard rock (rust rock) to soft rock (red sandstone), both types of hobs’ rock breaking loads decrease, but the CS hob’s decrease is significantly greater than the BT hob’s. Meanwhile, the optimal hob spacing for the CS hob increases from 40 mm to 50 mm, whereas for the BT hob, it remains at 30 mm. Considering the rock breaking load and rock breaking efficiency of the hobs together, the CS hob is found to be more suitable for soft rock formation, while the BT hob is more suitable for hard rock formation.</p>","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":"21 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141938933","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Why Do Drivers Decide to Violate Traffic Rules while Driving Through Road Tunnels? An Application of the Theory of Planned Behavior 为什么驾驶员决定在通过公路隧道时违反交通规则?计划行为理论的应用
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-06 DOI: 10.1007/s12205-024-1717-9
Guanfeng Yan, Yanjie Li, Mingnian Wang, Tao Yan

Few studies focus on exploring the relationship between psychological factors and drivers’ violation intention in the tunnel sections which feature several adverse characteristics like poor lighting and a monotonous driving environment. In this study, hierarchical multiple regression is adopted to test the predictive effect of the demographic parameters, standard theory of planned behavior (TPB) constructs, and three additional constructs of moral norms, past behavior, and perceived stress to account for intentions to violate traffic rules while driving through road tunnels. In this study, three typical violations while driving inside tunnels including changing the lane, overtaking, and speeding are selected. A sample of drivers (N = 384; 50.3% are men and 49.7% women) were surveyed through a self-report questionnaire. Hierarchical multiple regression analyses show that age appears to be the only significant predictor of violation intention among demographic parameters, and theory of planned behavior (TPB) components account for the majority of the variance in violation intention. In addition, moral norms show a negative significant relationship with violation intention while perceived stress is positively associated with violation intention. The findings could provide an important reference for the development of corresponding interventions.

隧道路段具有照明条件差、驾驶环境单调等不利特点,很少有研究集中探讨心理因素与驾驶员违章意向之间的关系。本研究采用分层多元回归法来检验人口学参数、标准计划行为理论(TPB)建构以及道德规范、过往行为和感知压力三个附加建构对驾驶者在隧道内驾驶时违反交通规则的意向的预测效果。本研究选择了在隧道内行驶时的三种典型违规行为,包括变更车道、超车和超速。通过自我报告问卷调查了驾驶员样本(N = 384;50.3% 为男性,49.7% 为女性)。层次多元回归分析表明,在人口统计学参数中,年龄似乎是唯一能显著预测违规意向的因素,而计划行为理论(TPB)成分则占违规意向变异的大部分。此外,道德规范与违规意向呈负相关,而感知压力与违规意向呈正相关。研究结果可为制定相应的干预措施提供重要参考。
{"title":"Why Do Drivers Decide to Violate Traffic Rules while Driving Through Road Tunnels? An Application of the Theory of Planned Behavior","authors":"Guanfeng Yan, Yanjie Li, Mingnian Wang, Tao Yan","doi":"10.1007/s12205-024-1717-9","DOIUrl":"https://doi.org/10.1007/s12205-024-1717-9","url":null,"abstract":"<p>Few studies focus on exploring the relationship between psychological factors and drivers’ violation intention in the tunnel sections which feature several adverse characteristics like poor lighting and a monotonous driving environment. In this study, hierarchical multiple regression is adopted to test the predictive effect of the demographic parameters, standard theory of planned behavior (TPB) constructs, and three additional constructs of moral norms, past behavior, and perceived stress to account for intentions to violate traffic rules while driving through road tunnels. In this study, three typical violations while driving inside tunnels including changing the lane, overtaking, and speeding are selected. A sample of drivers (N = 384; 50.3% are men and 49.7% women) were surveyed through a self-report questionnaire. Hierarchical multiple regression analyses show that age appears to be the only significant predictor of violation intention among demographic parameters, and theory of planned behavior (TPB) components account for the majority of the variance in violation intention. In addition, moral norms show a negative significant relationship with violation intention while perceived stress is positively associated with violation intention. The findings could provide an important reference for the development of corresponding interventions.</p>","PeriodicalId":17897,"journal":{"name":"KSCE Journal of Civil Engineering","volume":"32 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141938938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental and Theoretical Study on the Shear Performance of Single-Box Double-Compartment Segmental Box Girder 单箱双室节段箱梁剪切性能的实验和理论研究
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-06 DOI: 10.1007/s12205-024-2082-4
XiangYan Fan, FangWen Wu, LaiJun Liu, Meng Du, LiGuo Zhao, JinCheng Cao, Song Lei

In this study, the failure mode and mechanism of single-box two-compartment segmental box girders under flexural shear coupling were experimentally studied. Loading tests were conducted on five scaled girders, and the effects of the design parameters on the shear performance were analyzed. The test variables included the loading methods, ratio of internal to external prestressing tendons, and key joint types (vertical and horizontal keys). The test results indicated that different loading methods produce different stress characteristics and damage modes; however, the difference in the ultimate load capacity was negligible. The greater the number of internal prestressing tendons, the greater the bearing capacity. The stress increment of the internal bottom prestress reinforcement was great than the external prestressing tendons. Monolithic box girders could maintain approximately 1.8 times as much pressure as segmental box girders. With the increase of shear span ratio, the load carrying capacity of the segmental beam decreases. Vertical key teeth had a slightly higher bearing capacity than horizontal key teeth. Vertical keys are recommended for segmental box girders owing to their excellent structural properties and ease of construction. and the structure. AASHTO can better predict the shear capacity of segmental beams, while the Chinese code is applicable to segmental beams with appropriate hoop ratio.

本研究通过实验研究了单箱双室节段箱梁在挠剪耦合作用下的破坏模式和机理。对五片按比例缩放的箱梁进行了加载试验,分析了设计参数对箱梁抗剪性能的影响。试验变量包括加载方法、内外预应力筋的比例以及键连接类型(垂直键和水平键)。试验结果表明,不同的加载方法会产生不同的应力特性和破坏模式,但极限承载能力的差异可以忽略不计。内部预应力筋的数量越多,承载能力就越大。内部底部预应力筋的应力增量大于外部预应力筋。整体箱梁可承受的压力约为分段箱梁的 1.8 倍。随着剪跨比的增加,节段梁的承载能力也随之降低。垂直键齿的承载能力略高于水平键齿。由于垂直键具有出色的结构特性,且易于施工,因此建议将其用于节段箱梁。AASHTO 可以更好地预测节段梁的抗剪承载力,而中国规范适用于具有适当箍筋比的节段梁。
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引用次数: 0
Interpretable Capacity Prediction of RC Bridges Based on Genetic Algorithm-enhanced Support Vector Machine Learning 基于遗传算法增强型支持向量机学习的钢筋混凝土桥梁可解释承载力预测
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-06 DOI: 10.1007/s12205-024-1975-6
Shuming Zhou, Donghuang Yan, Yu He

Existing reinforced concrete (RC) bridges are subjected to environmental erosion and vehicle loads. It is becoming an urgent problem to evaluate the safety condition of bridge structures combining inspection data with artificial intelligence methods. This paper proposes a data-driven capacity assessment framework for existing RC bridges. The load capacity limit state (LCLS) and serviceability limit state (SLS) prediction model are established based on the proposed information fusion machine learning model. The genetic algorithm (GA) optimized support vector machine (SVM) learner is established to capture the relationship between the feature variables and the LSLS or SLS. Forty-five samples are obtained by static and dynamic simulation of the ANSYS models. Five-dimensional parameters are adopted as the key input parameters of the model, including the maximum dynamic deflection, crack opening ratio, and crack normal damage ratio at midspan, 1/4 span, and 3/4 span. The Shapley additive explanations method is proposed to conduct parameters sensitivity analysis. The results show that the GA-SVM regression algorithm in LCLS and SLS reduction factor prediction is better than the artificial neural network (ANN) model. The crack opening ratio is the most critical parameter that can considerably affect the outcomes of the LCLS and SLS prediction.

现有的钢筋混凝土(RC)桥梁受到环境侵蚀和车辆荷载的影响。如何结合检测数据和人工智能方法来评估桥梁结构的安全状况已成为一个亟待解决的问题。本文提出了一种数据驱动的现有 RC 桥梁承载能力评估框架。基于提出的信息融合机器学习模型,建立了承载能力极限状态(LCLS)和适用性极限状态(SLS)预测模型。建立了遗传算法(GA)优化支持向量机(SVM)学习器,以捕捉特征变量与 LSLS 或 SLS 之间的关系。通过 ANSYS 模型的静态和动态仿真获得了 45 个样本。采用五维参数作为模型的关键输入参数,包括中跨度、1/4 跨度和 3/4 跨度处的最大动态挠度、裂纹开裂率和裂纹法向破坏率。提出了 Shapley 相加解释法来进行参数敏感性分析。结果表明,GA-SVM 回归算法在 LCLS 和 SLS 降低系数预测中的效果优于人工神经网络(ANN)模型。裂缝开裂率是影响 LCLS 和 SLS 预测结果的最关键参数。
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引用次数: 0
A Method to Analyze the Formation of Plastic Hinges in RC Structures under Fire Conditions 分析火灾条件下钢筋混凝土结构塑性铰链形成的方法
IF 2.2 4区 工程技术 Q3 ENGINEERING, CIVIL Pub Date : 2024-08-06 DOI: 10.1007/s12205-024-0055-2
Weiyi Kong, Chuanguo Fu, Zhen Wang

RC structures are usually large, and it is arduous to use test methods to accurately analyse the redistribution of internal forces and development of plastic hinges during fires. This paper proposes a method for judging the formation and development of plastic hinges in the cross-sections of reinforced concrete structures under thermo-mechanical coupling effects. Using this method, the damage patterns of reinforced concrete structures under high temperatures are preliminarily studied. For reinforced concrete structures, the most severely damaged components during a fire may not necessarily be those on the floors exposed to the fire. For structural components on other floors, even if they remain at ambient temperature during the fire, the internal forces within them may undergo drastic changes due to the redistribution of internal forces throughout the structure. This can lead to reaching the yield limit or even the ultimate limit state, severely impacting the overall structural safety.

钢筋混凝土结构通常体积较大,使用测试方法准确分析火灾时内力的重新分布和塑性铰的发展非常困难。本文提出了一种在热机械耦合效应下判断钢筋混凝土结构截面塑性铰形成和发展的方法。利用这种方法,初步研究了高温下钢筋混凝土结构的破坏模式。对于钢筋混凝土结构而言,火灾中受损最严重的构件不一定是位于受火灾影响楼层的构件。对于其他楼层的结构构件,即使在火灾期间保持常温,由于整个结构的内力重新分布,其内部的内力也可能发生急剧变化。这可能导致达到屈服极限甚至极限状态,严重影响整体结构安全。
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引用次数: 0
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KSCE Journal of Civil Engineering
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