Results 11 to 20 of about 471,426 (159)
Jianzhu Gangjiegou Jinzhan, 2022 为分析Q690和Q275双排螺栓连接角钢的块剪破坏承载性能，采用ABAQUS软件建立非线性有限元计算模型，结合已有角钢螺栓连接受拉块剪破坏的试验数据，验证了模型的准确性。在此基础上，建立参数化模型分析了钢材强度等级、螺栓端距、螺栓数量和连接形式对角钢承载性能的影响，并基于分析结果对中、美钢结构设计规范和文献提出的块剪破坏计算公式进行了评估。结果表明：Q690高强度双排螺栓连接角钢的延性低于Q275强度角钢的延性，但仍然呈现出明显的延性破坏特性。螺栓端距和数量的增加可以提高角钢块剪破坏时的极限承载力 ...
张茗渊, 柯珂
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Jianzhu Gangjiegou Jinzhan, 2021 以圆钢管混凝土平面K形相贯节点试验数据为基础,以弦杆径厚比γ、腹杆与弦杆管径比β、壁厚比τ和夹角θ为研究参数,建立有限元参数分析模型,进行非线性有限元参数分析,得到该类型节点的典型破坏模式,并建立了节点的极限承载力计算模型。结果表明:圆钢管混凝土K形相贯节点典型破坏模式是腹杆失效和弦杆冲剪破坏,控制指标是腹杆与弦杆的壁厚比τ和夹角θ。在CIDECT建议的空心圆钢管相贯节点基于冲剪破坏的极限承载力计算公式基础上,采用最小二乘法得到圆钢管混凝土K形相贯节点的冲剪承载力计算模型 ...
高春彦, 王佳丽, 郭大伟
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Jianzhu Gangjiegou Jinzhan, 2023 为研究窄翼缘PEC中长柱轴压整体稳定性能，设计制作9根组合长细比介于76~141（正则化长细比介于0.84~1.55）的窄翼缘PEC中长柱，进行轴压整体稳定性能试验。研究窄翼缘PEC中长柱的初始弯曲、长细比、混凝土强度等因素对其破坏模式和轴压整体稳定承载力的影响。试验结果表明，窄翼缘PEC中长柱在轴压荷载下的破坏模式表现为绕弱轴的弯曲失稳，长细比和初始弯曲显著影响试件的破坏模式和极限承载力。当试件的正则化长细比大于1.0，初始弯曲大于L/1 000时，试件的破坏模式表现为整体极值点失稳 ...
张文轩 +5 more
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Functional Ecology, Volume 40, Issue 6, Page 1878-1891, June 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Ecological communities are stressed by rapid and complex anthropogenic changes, threatening the persistence of biotic interactions and ecosystem functioning. Plant–pollinator communities, for instance, undergo structural transformations as a result of land‐use change ...
Erliang Gao +8 more
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Integrative Conservation, Volume 5, Issue 1, Page 86-103, March 2026.Urbanization may alter bird foraging. Austral Parakeets (Enicognathus ferrugineus) in Patagonia rely on introduced plants in urban areas, especially in winter, despite preferring natives in the wild. This seasonal reliance on introduced species highlights urbanization trade‐offs and underscores the need to manage green areas with native plants to ...
Rocío Bahía +2 more
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Emerging Risks and Housing Affordability Policy in Miami High‐Rises
Journal of Critical Infrastructure Policy, Volume 7, Issue 2, Fall/Winter 2026.ABSTRACT Recent advances in satellite‐based remote sensing and building performance measurement have raised critical questions regarding the long‐term settlement behavior of high‐rise structures situated on the complex subsurface of southeastern Florida.
Jean‐Pierre Bardet, Jeffrey Dorfman
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Jianzhu Gangjiegou Jinzhan, 2020 采用有限元方法对自攻螺钉搭接连接薄钢板在高温下的抗剪性能进行了研究。薄钢板厚度分别采用0.42mm,1.20mm,1.90mm;通过改变温度和自攻螺钉的布置方式,研究抗剪连接件的承载力和破坏模式。分析结果表明:自攻螺钉搭接连接薄钢板在剪力作用下,会发生明显的倾斜;自攻螺钉沿受力方向布置时的承载力略高于垂直受力方向布置时的承载力,两者破坏模式相似;节点在高温下的破坏模式与在常温下类似。将模拟结果与冷成型钢设计规范的预测结果进行比较,发现现行规范可以较准确地预测抗剪连接件的破坏模式,而对其承载力的预测 ...
张曼 +4 more
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT The escalating issue of drug‐resistant pathogens, largely driven by the overuse of conventional antibiotics, has become a significant global health threat. Developing alternative therapeutic strategies and fabricating natural biological enzyme materials that mimic the high efficiency, selectivity, and mild‐operating conditions of natural ...
Shuai He +11 more
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Integrative Conservation, Volume 4, Issue 4, Page 686-694, December 2025.The soil fungicide reduces the occurrence of pathogenic fungi in invaded soil and at the same time promotes the recruitment of mycorrhizal fungi and saprophytic fungi by the plants. The addition of biochar to the invaded soil has a negative legacy effect on subsequent invasive plants, while it exerts a positive enhancement effect on native plants ...
Weitao Li +5 more
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Politics &Policy, Volume 53, Issue 3, June 2025.ABSTRACT Deep fakes can be used for political advertising, enabling politicians to change their characteristic features or minimize deficits of their performances. Such a strategy may meet with great interest, which in some circumstances increases participation and might influence deliberation. It was applied in South Korea, and its variations appeared
Mateusz Łabuz, Grażyna Strnad
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