Results 11 to 20 of about 19,072 (129)
Jianzhu Gangjiegou Jinzhan, 2023 为了适应装配式自复位空间钢框架的节点开口和框架整体膨胀效应，提出一种带滑动次梁构造的装配式自复位空间钢框架。采用ABAQUS软件对装配式自复位空间钢框架进行有限元数值模拟对比分析，并在数值模拟基础上完成了新型滑动次梁的可行性分析。结果表明：数值模拟结果在节点开口、滞回曲线、索力变化和应变等方面均与试验结果吻合良好，验证了采用有限元方法研究的可行性；新型滑动次梁的设计有效地放松了楼板对装配式自复位空间钢框架的约束作用，达到了新型滑动次梁与自复位节点同步开口的目标，顺利实现了开口-闭合机制。
张艳霞 +3 more
doaj
, 2023 综合形状记忆合金（shape memory alloy，SMA）材料和摩擦机制的优点，提出了一种具有耗能时序的变摩擦自复位阻尼器（self-centering variable friction damper with energy-dissipation sequences，SVFDES）。首先说明了SVFDES的构造设计及变形模式，开展了SMA棒的循环拉伸试验研究以确定材料的力学参数。之后利用经试验验证的数值模拟方法建立了SVFDES的精细化有限元模型 ...
刘思佳, 刘艳芝, 张萍, 柯珂
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Research on the comprehensive control technology system of large-scale debris flows in the area affected by strong earthquake in Longmenshan, Sichuan Province [PDF]
In response to the challenges posed by frequent, widespread, long-lasting, large-scale, severe, and difficult-to-control debris flows in strong earthquake areas, this study, based on the results of the National Key R&D Program, investigates dozens of ...
Bin YU +4 more
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Evaluating the Performance of Python-Based Machine Learning in Earthquake-Resistant Building Design [PDF]
This study investigates the feasibility of applying artificial intelligence (AI)-based machine learning techniques, specifically a Multiple Linear Regression (MLR) model implemented in Python, for earthquake-resistant building design.
Guntur Nugroho, Sameh Fuqaha
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Jianzhu Gangjiegou Jinzhan, 2022 考虑部分包裹混凝土（partial encased concrete，PEC）柱截面形式和辅助耗能元件类型两个设计参数，设计制作了3榀PEC柱-钢梁通长预拉杆自复位连接组合框架中间层子结构1∶2缩尺试件并进行水平往复荷载试验。通过试验现象和实测数据整理，从滞回特性、抗侧刚度、复位能力与耗能性能等方面进行分析。结果显示：合理设计T形件上长圆孔尺寸可实现“中震作用下利用辅助耗能元件提供耗能，而大震作用下连接转换为承压型传力模式而进一步发挥主体构件力学性能”的性能化部分自复位连接设计理念 ...
方有珍, 赵子凡, 陈军, 沈文聪
doaj
Pseudo static test for pre-cast segmental bridge columns with dry joints [PDF]
, 2011 为了比较节段拼装桥墩与整体现浇桥墩之间抗震性能的差异,以是否存在预应力钢筋、不同施工方法、预应力筋的位置和粘结状态、是否存在耗能钢筋等为试验参数,设计了一个包含五种不同构造类型混凝土桥墩的试验方案。采用拟静力试验方法比较分析了这五种不同构造类型混凝土桥墩的破坏形态、易损部位、荷载位移滞回曲线、节段拼装桥墩接缝的开展、拟静力残余位移、曲率分布、耗能能力、粘滞阻尼比等,得到了三种节段拼装桥墩、整体现浇钢筋混凝土桥墩和预应力混凝土桥墩之间拟静力行为的异同。试验结果表明 ...
林铁良, 葛继平, 高婧
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Seismic Response Analysis of Small Modular Reactor Containment Based on LRB and FPS Isolation Strategies [PDF]
Small modular reactor (SMR) refers to a new generation of reactors with a unit power output of less than 300 MW. These reactors utilize innovative technologies for modular design and rapid on-site assembly.
JI Xiaoyu1, CHEN Nanyu1, CHEN Mufeng2, ZHANG Shuaijun1, HOU Gangling1, CAI Xuesong1
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Conservation Biology, EarlyView.Abstract Human development is a driver of global change and a major threat to biodiversity. Protected areas maintain and support biodiversity, but outside stressors, such as climate change and land use change, can negatively influence natural resources within protected areas.
Leah J. Rudge +2 more
wiley +1 more source
, 2018 基于机器人与互联网的智能化新时代背景,针对传统针织圆纬机编织过程中断纱必须依靠人工操作接纱而一直无法用机器替代的问题,研发一种用于针织圆纬机的圆柱坐标机器人,以实现智能检测纱疵、自动清纱接纱以及多模态除絮工作。介绍圆柱坐标机器人的基本结构、工作原理、控制系统及应用优势。使用该圆柱坐标机器人可以自动清纱并复接,代替人工接纱操作和除絮步骤,有效降低运营成本,大幅度提高生产效率及织物品质,提升圆纬机智能化程度,推动圆纬机装备行业向智能化技术转型升级,为实现智能工厂 ...
刘德滨 +5 more
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Conservation Biology, EarlyView.Abstract Although significant biodiversity has been safeguarded by protected areas (PAs), biodiversity trends continue downward. Within the frameworks of the EU Biodiversity Strategy for 2030 and the new EU Restoration Regulation (2024), conserving critical biodiversity areas is essential.
George Kefalas +14 more
wiley +1 more source