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建筑工程与管理我国当前正处于社会经济飞速发展的阶段，社会条件不断改善，城市化进程不断深化。但与此同时我国也是一个幅员辽阔、人口众多的国家，城市的发展让交通建设的工作量越来越大。交通建设工程涉及到很多方面的内容，市政桥梁作为其中之一，是一项比较关键的内容，起到了连接不同城市和地域的作用。结合现如今市政桥梁工程的建设和发展，能够发现预应力技术的应用比较普遍，这与预应力技术的作用和优势是分不开的，该技术能够在较大程度上控制和减少混凝土的裂缝问题。基于此，本文便阐述了预应力技术在市政桥梁工程中的具体应用 ...
宝杰 郑
semanticscholar +2 more sources
Jianzhu Gangjiegou Jinzhan, 2015 对铰接半刚性结构找形、找力分析,提出一种精确的非线性有限元方法.分两步建立找形与找力分析迭代公式。第1步:基于荷载态节点坐标、预应力态节点坐标及预应力态单元预应力,建立荷载态结构非线性平衡方程,根据矩阵微分理论、Newton切线法概念和边界条件求解荷载态结构非线性平衡方程,从而得到预应力态节点坐标迭代公式;第2步:基于预应力态节点坐标、零态节点坐标和预应力态单元预应力,建立预应力态结构非线性平衡方程,同样根据上述理论和概念以及边界条件求解预应力态结构非线性平衡方程,从而得到零态节点坐标迭代公式 ...
刘树堂
doaj
Functional Ecology, EarlyView.Read the free Plain Language Summary for this article on the Journal blog. Abstract Decomposition is the transformation of dead organic matter into its inorganic constituents. In most biomes, decomposition rates can be accurately predicted with simple mathematical models, but these models have long under‐predicted decomposition in globally extensive ...
Heather L. Throop +8 more
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Setting goals for pollinator gardens
Conservation Biology, EarlyView.Abstract In recent years, declines in animal pollinators have stimulated tremendous interest in pollinator‐friendly gardening. There is a widespread notion that pollinator gardens are beneficial, but the specific capacity of pollinator gardens to improve biodiversity conservation and societal well‐being remains unclear.
Nicholas N. Dorian +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2022 张弦结构由上弦刚体、下弦柔性拉杆及其之间的刚性撑杆构成。异形张弦梁钢拉杆非张拉建立预应力施工技术，即在张弦梁安装阶段对上弦刚体进行预变形处理，并调节钢拉杆的长度，再通过卸载临时支撑，上弦刚体回弹，在撑杆的作用下钢拉杆被动受拉，从而为张弦梁建立预应力，临时支撑的卸载过程即为张弦梁的加载过程。实施该方法之前先进行全过程施工模拟计算，施工过程中进行应力-应变监测，施工完成后对钢拉杆进行内力检测。结果表明，该施工技术的力学原理成立，操作简便，内力转换高效，精度满足要求，对类似工程具有参考意义。
周国军 +3 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT E‐books, powered by multimedia and interactive features, are widely used to support young children's language and literacy development. This study examines the relations of e‐book narration and bilingual parent–child talk to children's learning during shared reading. Data from 121 English learners in China and their parents were analyzed using
Dandan Yang +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2018 预应力部分外包组合结构是预应力钢-混凝土组合结构的一种特殊形式,有自重轻、跨度大、截面尺寸小和节约材料等特性,能够很好地提高构件的承载力。对8根部分外包组合简支梁进行了承载力试验研究,其中包括6根预应力和2根普通部分外包组合简支梁。研究表明:横截面面积越大预应力部分外包钢的抗弯承载力越高;而且预应力部分外包组合简支梁相对与普通部分外包组合简支梁,抗弯承载力和变形能力有很大的提高。在试验研究的基础上,提出了预应力部分外包组合简支梁承载力建议计算公式 ...
邓宇, 张鹏, 张祥宁, 和真理
doaj
International Journal of Applied Linguistics, EarlyView.ABSTRACT Despite artificial intelligence (AI) emerging as a key driver of innovation and transformation in language education, how to enhance language teachers’ AI literacy and understand their emotional experiences in AI‐mediated teaching remains largely unexplored.
Xiao Xie +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2016 作为一种新型弦支结构体系,弦支网架由上部刚性网架和下部柔性索通过支杆相连而成。通过预应力张拉可将拉索预应力引入弦支网架中,从而改善结构受力性能,因此预应力张拉施工至关重要。以天津北塘文体中心弦支网架为研究对象,使用ANSYS有限元软件,采用单元生死技术和多时间步连续分析方法对弦支网架预应力张拉施工过程进行模拟,确定了施工过程中各拉索的张拉控制值,并分析了在施工过程中拉索内力、结构位移和杆件应力的变化规律,为该工程预应力张拉施工提供了依据。可为其它弦支网架工程的预应力张拉施工模拟提供参考。
陈志华 +4 more
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Public Administration, EarlyView.ABSTRACT A “whole community” strategy is central to disaster management and community resilience in the United States. However, the specific means by which community‐level stakeholders in the private and nonprofit sectors function as partners with government agencies in providing key disaster‐related services are currently underexamined.
Suyang Yu, Brian J. Gerber
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