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Effect of eccentricity in reinforced concrete beam-column-slab connection under cyclic loading

Rooh ULLAH, Amjad NASEER, Muhammad FAHIM, Mohammad ASHRAF, Eid BADSHAH

《结构与土木工程前沿（英文）》 2021年第15卷第2期页码 390-398 doi: 10.1007/s11709-021-0690-3

摘要： Beam–column connections are one of the most critical elements of reinforced concrete structures, especially in seismically active regions, and have been extensively evaluated experimentally and numerically. However, very limited experimental studies about eccentric reinforced concrete connections including the effect of connected slabs are available. This study presents the experimental results of two half-scale eccentric beam-column-slab connections subjected to quasi-static cyclic loading. The horizontal eccentricity ( ) is maintained at 12.5% and 25% of column width ( ) for specimens 1 and 2, respectively. The damage pattern, performance levels, displacement ductility ( ), energy dissipation, and connection strength and stiffness are compared for both specimens, and the effect of eccentricity is evaluated. It is concluded that the eccentricity has no significant effect on the lateral load carrying capacity; however, the overall strength degradation increases with the increase in eccentricity. Similarly, the elastic stiffness of specimen 2 decreased by 14% as the eccentricity increased from 12.5% to 25%; however, the eccentricity had no significant effect on the overall stiffness degradation. decreased by 43%, and the energy dissipation capacity decreased by 40% in specimen 2 with higher eccentricity. The story drifts corresponding to the performance levels of the life safety (LS) and collapse prevention (CP) were found to be 28% lesser in specimen 2 than in specimen 1.

关键词： corner connection eccentricity strength degradation stiffness degradation energy dissipation performance levels

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Detection for transverse corner cracks of steel plates’ surface using wavelet

Qiong ZHOU, Qi AN

《机械工程前沿（英文）》 2009年第4卷第2期页码 224-227 doi: 10.1007/s11465-009-0017-x

摘要： An algorithm is presented for detecting transverse corner cracks at a steel plate surface using wavelet transform. According to characteristics of transverse corner crack images, the wavelet transform is used for the multi-scale analysis of detecting the image edges and disintegrating the image into four directions at the same time. The proper threshold value is chosen to segment the image into vertical components to obtain the final detection result. The experiment shows that transverse corner cracks of steel plates can be more effectively extracted by the proposed method than the other two common methods.

关键词： transverse corner cracks defect detection multi-scales wavelet analysis

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Shadow obstacle model for realistic corner-turning behavior in crowd simulation

Gao-qi HE,Yi JIN,Qi CHEN,Zhen LIU,Wen-hui YUE,Xing-jian LU

《信息与电子工程前沿（英文）》 2016年第17卷第3期页码 200-211 doi: 10.1631/FITEE.1500253

摘要： This paper describes a novel model known as the shadow obstacle model to generate a realistic corner-turning behavior in crowd simulation. The motivation for this model comes from the observation that people tend to choose a safer route rather than a shorter one when turning a corner. To calculate a safer route, an optimization method is proposed to generate the corner-turning rule that maximizes the viewing range for the agents. By combining psychological and physical forces together, a full crowd simulation framework is established to provide a more realistic crowd simulation. We demonstrate that our model produces a more realistic corner-turning behavior by comparison with real data obtained from the experiments. Finally, we perform parameter analysis to show the believability of our model through a series of experiments.

关键词： Corner-turning behavior Crowd simulation Safety awareness Rule-based model

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P60钢轨鱼鳞伤萌生寿命

石嵘,范志毅,何越磊

《中国工程科学》 2008年第10卷第8期页码 65-68

摘要：

上海轨道交通1号线锦江乐园至莘庄路段P60钢轨使用至今已出现不同程度伤损。曲线路段的部分钢轨外轨内侧出现鱼鳞伤，严重的鱼鳞伤甚至向下发展导致核伤。鱼鳞伤在疲劳裂纹的初期发展缓慢，随着疲劳荷载次数增加，裂纹深度扩展速率dh/dN发生转折。定义裂纹深度扩展速率发生转折时对应的疲劳荷载的次数为鱼鳞伤萌生寿命。

关键词：钢轨鱼鳞伤疲劳裂纹裂纹深度扩展速率萌生寿命

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墙角火灾环境下钢构件温度分布及响应行为的实验研究

陈长坤,姚斌,杨昀,蔡昕,张和平,万玉田

《中国工程科学》 2005年第7卷第9期页码 70-75

摘要：

利用ISO9705标准火灾实验系统，模拟墙角火灾环境，以薄壁方管钢梁为研究对象，对钢构件在热、力耦合作用下的行为进行实验研究。对火灾的热释放速率与室内温度场，钢构件及其表面气体的温度、构件在火灾作用下的挠度进行测量，分析真实火灾下钢构件温升及温度分布的特点与火灾发展对构件挠度的影响。研究结果表明钢构件在长向上存在着很大的温差，而构件的挠度变化也并不对称，这说明以往研究中往往假设钢构件在长向上温度一致并不恰当，这种非均匀温度场对构件的行为有着重要影响，它使得构件高温区部分更易发生局部屈服而失效，在相同规模的火灾环境下，与均匀温度场相比，这种墙角火灾所导致的非均匀温度场更不利于钢构件的安全。

关键词： ISO标准火灾实验系统钢构件墙角火温度分布

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Risk evaluation for the task transfer of an aircraft maintenance program based on a multielement connection

《工程管理前沿（英文）》 doi: 10.1007/s42524-023-0282-0

摘要： This paper proposes a framework for evaluating the efficacy and suitability of maintenance programs with a focus on quantitative risk assessment in the domain of aircraft maintenance task transfer. The analysis is anchored in the principles of Maintenance Steering Group-3 (MSG-3) logic decision paradigms. The paper advances a holistic risk assessment index architecture tailored for the task transfer of maintenance programs. Utilizing the analytic network process (ANP), the study quantifies the weight interrelationships among diverse variables, incorporating expert-elicited subjective weighting. A multielement connection number-based evaluative model is employed to characterize decision-specific data, thereby facilitating the quantification of task transfer-associated risk through the appraisal of set-pair potentials. Moreover, the paper conducts a temporal risk trend analysis founded on partial connection numbers of varying orders. This analytical construct serves to streamline the process of risk assessment pertinent to maintenance program task transfer. The empirical component of this research, exemplified through a case study of the Boeing 737NG aircraft maintenance program, corroborates the methodological robustness and pragmatic applicability of the proposed framework in the quantification and analysis of mission transfer risk.

关键词： risk evaluation maintenance steering group analytic network process task transfer maintenance program

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Mouth the mirror of lungs: where does the connection lie?

null

《医学前沿（英文）》 2016年第10卷第4期页码 405-409 doi: 10.1007/s11684-016-0476-5

摘要：

Periodontitis is the chronic destructive disease of the periodontium (Gums) caused by host bacterial interactions. The effect of such host bacterial interactions in oral cavity also evokes a systemic response. Numerous studies have found common mechanisms of destruction for periodontal diseases and other chronic diseases like diabetes mellitus, atherosclerosis, respiratory diseases, and adverse pregnancy outcomes. Oral colonization by respiratory pathogens appears to be a risk factor for development of respiratory diseases and oral interventions aimed at reducing oral bacterial count have resulted in reduced incidence of these reparatory illness. This reflects the importance of oral hygiene among patients with respiratory illness. This review highlights the association between periodontal diseases and respiratory diseases.

关键词： periodontitis respiratory diseases acute pneumonia COPD

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Static behavior of planar intersecting CFST connection in diagrid structure

Ling LI, Xianzhong ZHAO, Ke KE

《结构与土木工程前沿（英文）》 2011年第5卷第3期页码 355-365 doi: 10.1007/s11709-011-0125-7

摘要： Intersecting connection plays an important role in the new diagrid structural system for high-rise buildings. To investigate the static behavior of the intersecting connection of concrete-filled steel tubular (CFST) columns, a typical reduced-scale planner connection specimen is tested under monotonic axial compression. The failure modes, force mechanism and bearing capacity of intersecting CFST connections are analyzed further in the follow-up numerical simulation, considering influences of intersecting angle, elliptical plate and ring plate. Test and simulation results prove that, intersecting connection can develop fully plastic deformation and provide sufficient bearing capacity. Parametric analysis indicates that bearing capacity of planar intersecting CFST connection mainly depends on intersecting angle and thickness of elliptical plate, while the ring plate affects that little. Capacity estimation method for planar intersecting CFST connection is proposed basing on the capacity of the critical section which is located near intersecting center for a distance of steel tube radius, and the design suggestions is provided in the end of this paper.

关键词： diagrid structure concrete-filled steel tube planar intersecting connection experimental research mechanism analysis

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Investigation of fatigue resistance of fillet-welded tube connection details for sign support structures

Hyungjoo CHOI, Husam NAJM

《结构与土木工程前沿（英文）》 2020年第14卷第1期页码 199-214 doi: 10.1007/s11709-019-0592-9

摘要： Stiffened and unstiffened fillet-welded tube-to-transverse plate connection details are widely used for mast-arm and base-plate connections for highway sign structures. However, due to repetitive wind loads, cyclic fatigue stresses are induced and they are the primary source of failure in welded connections at these locations. The resistance of fatigue critical details has been an on-going research topic because of limited experimental results and the variability in existing fatigue testing results. The main objective of this study is to evaluate fatigue resistance of fillet-welded tube connection details by utilizing the advanced fatigue tool in ANSYS Workbench platform. Finite Element (FE) models development and model validation using existing test data was presented. The resulting fatigue resistance from FE analysis was expressed in terms of fatigue life, fatigue damage, and fatigue safety factor to determine the fatigue performance of fillet-welded connections. Existing fatigue test data was grouped to perform a synthetic analysis and then analysis results were provided to determine input data and fatigue limit for the fatigue module. The local stress level at fatigue critical locations was evaluated using a static FE model for different number of stiffeners and boundary conditions. The results of this investigation provides fatigue resistance of fillet-welded connection details in the form of fatigue life, fatigue damage and safety factor for various connection parameters and structural conditions.

关键词： fatigue weld connections base plate fillet welds

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室内装饰材料的标准房间/墙角火实验研究进展

杨昀,张和平,刘激扬

《中国工程科学》 2003年第5卷第4期页码 55-60

摘要：

标准房间/墙角火实验是一种全尺度火灾实验研究方法，主要用来研究室内装饰材料的火灾特性。介绍了ISO 9705房间/墙角火实验方法的原理和实验装置，以及国内外利用该方法对装饰材料火灾特性进行研究的进展情况，包括对材料热释放速率、烟气产生和室内火蔓延方面的研究。分析了其研究成果在室内装饰材料的分类及火灾危险性评估中的实际应用情况，并结合作者目前的工作对未来的研究内容做了一些展望。

关键词：装饰材料全尺度 ISO 9705 房间/墙角火实验

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An innovative model for predicting the displacement and rotation of column-tree moment connection under

Mohammad Ali NAGHSH, Aydin SHISHEGARAN, Behnam KARAMI, Timon RABCZUK, Arshia SHISHEGARAN, Hamed TAGHAVIZADEH, Mehdi MORADI

《结构与土木工程前沿（英文）》 2021年第15卷第1期页码 194-212 doi: 10.1007/s11709-020-0688-2

摘要： In this study, we carried out nonlinear finite element simulations to predict the performance of a column-tree moment connection (CTMC) under fire and static loads. We also conducted a detailed parameter study based on five input variables, including the applied temperature, number of flange bolts, number of web bolts, length of the beam, and applied static loads. The first variable is changed among seven levels, whereas the other variables are changed among three levels. Employing the Taguchi method for variables 2–5 and their levels, 9 samples were designed for the parameter study, where each sample was exposed to 7 different temperatures yielding 63 outputs. The related variables for each output are imported for the training and testing of different surrogate models. These surrogate models include a multiple linear regression (MLR), multiple Ln equation regression (MLnER), an adaptive network-based fuzzy inference system (ANFIS), and gene expression programming (GEP). 44 samples were used for training randomly while the remaining samples were employed for testing. We show that GEP outperforms MLR, MLnER, and ANFIS. The results indicate that the rotation and deflection of the CTMC depend on the temperature. In addition, the fire resistance increases with a decrease in the beam length; thus, a shorter beam can increase the fire resistance of the building. The numbers of flanges and web bolts slightly affect the rotation and displacement of the CTMCs at temperatures of above 400°C.

关键词： column-tree moment connection Finite element model parametric study fire regression models gene expression programming

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Simulation of grid connection and maximum power point tracking control of brushless doubly-fed generator

Hicham SERHOUD, Djilani BENATTOUS

《能源前沿（英文）》 2013年第7卷第3期页码 380-387 doi: 10.1007/s11708-013-0252-z

摘要： In this paper, based on the analysis of the mathematical model in a common synchronous reference frame of the brushless doubly-fed generator (BDFG), the grid connection strategy and maximum energy extraction control were both analyzed. Besides, the transient simulation of no-load model and generation model of the BDFG have been developed on the MATLAB/Simulink platform. The test results during cutting-in grid confirmed the good dynamic performance of grid synchronization and effective power control approach for the BDFG-based variable speed wind turbines.

关键词： brushless doubly-fed generator (BDFG) modeling grid connection control back-to-back pulse-width modulation (PWM) converter wind power generation

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基于智能网联的特种设备智能制造发展思路分析

刘三江,陈祖志,石坤,李光海

《中国工程科学》 2020年第22卷第6期页码 143-150 doi: 10.15302/J-SSCAE-2020.06.019

摘要：

特种设备是国民经济建设和社会生活的重要基础设施，在特种设备领域发展智能制造、实现特种设备制造业的转型升级，是“中国制造 2025”的重要组成部分。本文分析了特种设备的特点及发展现状，梳理了发展特种设备智能制造的需求情况，提出了推动特种设备制造业由大变强的有效手段及发展思路。研究提出，发展特种设备智能制造的指导思想是采用并联式发展道路，并行推进特种设备行业工业 2.0、工业 3.0、工业 4.0 的发展；发展重点是产品可追溯、质量管理智能化、动态风险实时监控。在此基础上，引入智能网联技术思路作为特种设备智能制造的发展路径，分析智能网联的技术内涵，着重从特种设备智联网构建、智能应用开发两方面提出了基于该路径的特种设备智能制造关键任务，以期为特种设备领域推进智能制造提供理论参考。

关键词：特种设备智能制造智能网联并联式发展

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智联计算网络技术发展研究

李丹,胡宇翔,潘恒,张建辉,邬江兴

《中国工程科学》 2023年第25卷第6期页码 39-48 doi: 10.15302/J-SSCAE-2023.06.014

摘要：

算网融合的理念和技术处于发展初期，相应计算任务调度、网络互联也处于“脱节”状态，因而把握智联计算网络技术发展趋势并提出自主创新的战略构想及发展路线成为亟需。本文分析了现有信息网络技术面临的挑战，提炼出网络与计算融合发展的主要趋势；论证形成我国自主创新的智联计算网络核心架构，精准阐明智联计算网络的发展目标与预期效益；深入剖析智联计算网络技术发展路线，涵盖多样化协议支撑、“网 ‒ 算 ‒ 存”一体化控制、服务功能智能编排、内生安全构造等智联计算网络关键技术布局，智慧园区网络场景、垂直行业网络场景、数据中心网络场景等智联计算网络示范应用。研究建议，深入创新智联计算网络技术体系，广泛部署智联计算网络示范应用，加速推动智联计算网络产品落地，以此促进智联计算网络技术的演进与应用。

关键词：智联计算网络；多样化协议；“网 ‒ 算 ‒ 存”一体化；服务功能智能编排；内生安全

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大规模海上风电并网送出策略研究

张占奎,石文辉,屈姬贤,白宏

《中国工程科学》 2021年第23卷第4期页码 182-190 doi: 10.15302/J-SSCAE-2021.04.021

摘要：

海上风电是世界风电未来发展的重要方向，经济高效地解决大规模海上风电并网问题是海上风电建设面临的核心挑战之一。本文总结了世界海上风电的发展现状、我国海上风电发展环境及行业进展，归纳了海上风电的全球性发展趋势；从海上风电场单场典型并网、大规模海上风电集群送出两类典型情景出发，梳理了相关技术特征及其代表性应用。在凝练我国海上风电并网送出面临问题的基础上，提出了我国海上风电并网的整体发展策略，并就两类典型情景的送出方案开展适应性分析和评价。研究建议，摸清资源储量、确定统一规划理念，加强自主创新、突破并网关键技术，完善体制机制、确保高质量发展，加强国际交流、促进国际产业合作，以此谋划和建设一流水平、契合国情的海上风电并网送出工程，更好支撑我国能源转型发展。

关键词：海上风电集群并网送出规划方案适应性分析