Results 21 to 30 of about 4,215 (165)

大型商业建筑的TMD减振控制研究

open access: yesJianzhu Gangjiegou Jinzhan, 2018
大型商业建筑中庭的大悬挑梁和大跨连廊的结构设计往往由人致振动舒适度指标控制,有必要采用有效的减振措施。整理了各国的舒适度评价指标,把大型商场人行激励按照步频分为密集人流慢走和快走6个工况,采用调频质量阻尼器(TMD)系统对实际工程进行减振控制,包含单模态控制TMD、多模态控制MTMD和单模态控制MTMD。对8.678m跨度悬挑梁、26m跨度侧挑1.9m和3.9m钢连廊进行TMD系统减振分析,基本覆盖了大型商业建筑的需求。结果表明安装TMD、MTMD系统后结构的最大竖向加速度幅值明显减小 ...
胡振青, 蔡琪锐
doaj  

大跨度钢结构楼盖振动舒适度分析

open access: yesJianzhu Gangjiegou Jinzhan, 2020
结合实际案例,对某大跨度钢结构单体楼盖的振动舒适度进行分析计算,并复核计算峰值加速度满足人体舒适度的情况;介绍了大跨度钢结构楼盖模态分析、稳态分析、人行激励及人群节奏运动加速度分析的方法;阐述了柔性楼盖舒适度设计的注意要点。
杜侠伟
doaj  

Structural lobbying power? An exploration of patterns in preference attainment at varying levels of lobbying activity

open access: yesPolicy Studies Journal, EarlyView.
Abstract Studies of lobbying typically look at the extent to which interest groups realize political goals on issues they actively lobby for. Little is known, however, about the extent to which interest groups attain their political goals without making an active lobbying effort.
Marcel Hanegraaff   +2 more
wiley   +1 more source

The Inclusion Trade‐Off: Comparing the Design and Functionality of Collaborative Governance Forums

open access: yesPolicy Studies Journal, EarlyView.
ABSTRACT Environmental challenges require collaboration across jurisdictions, often through forums or intermediary spaces for repeated interaction. A persistent forum design question concerns inclusion criteria, or which actors should be included.
Adam Wiechman   +3 more
wiley   +1 more source

Historical Institutionalism and Transnational Influence: Social Policy Responses to the Great Depression in the United States and Canada

open access: yesPolitics &Policy, Volume 54, Issue 2, April 2026.
ABSTRACT The Great Depression was a turning point in the development of social programming in North America. This paper explores the politics of social policy expansion during the Great Depression in the United States and Canada through an analytical lens that combines the insights of historical institutionalism and the analysis of transnational ...
Daniel Béland   +2 more
wiley   +1 more source

截面温度不均匀受约束波纹腹板梁悬链线效应参数分析

open access: yesJianzhu Gangjiegou Jinzhan, 2017
利用经试验验证的有限元模型对均匀温度和不均匀温度分布下轴向约束波纹腹板梁的悬链线效应进行了参数分析,选取荷载比、轴向约束刚度比、跨高比及倾角为主要参数,研究了钢梁的跨中挠度、梁端轴力和悬链线弯矩等随温度的变化规律,并给出了火灾下钢梁的临界温度。由于不均匀温度下产生的热弯曲,钢梁在压力阶段的挠度更大而轴力更小。但均匀温度下钢梁的破坏温度比不均匀温度情况时高。钢梁的悬链线温度和破坏温度都随着荷载比的增大而降低。相同荷载比作用下,不同跨高比钢梁的悬链线温度相同,但其破坏温度随跨高比的增大而升高 ...
陈恒超, 刘昌斌
doaj  

Paradiplomacy and City Diplomacy From the Theoretical Perspectives of Tourism and International Relations: An Analysis of the City of São Paulo, Brazil

open access: yesLatin American Policy, Volume 17, Issue 1, March 2026.
ABSTRACT Tourism and International Relations, as interdisciplinary fields, encompass diverse knowledge, making them complex subjects. This article explores how official international relations bodies at subnational levels influence tourism using paradiplomacy and city diplomacy concepts.
Juliane Santos Lumertz   +3 more
wiley   +1 more source

开口索穹顶结构抗倒塌性能及参数影响研究

open access: yesJianzhu Gangjiegou Jinzhan
开口索穹顶是一种新型索穹顶,其工程应用较少,抗倒塌性能尚未明确。设计了一组大跨度开口索穹顶结构,进行连续倒塌非线性动力分析,研究不同类型单根索杆破断情况下结构的抗倒塌能力,以及初始预应力、开口大小等参数对索穹顶结构连续倒塌性能的影响。计算结果表明:外环索是开口索穹顶结构抗连续倒塌的关键杆件;不同参数的开口索穹顶结构,单根外环索破断,节点的最大竖向位移大多为结构跨度的1/14左右,最大达到结构跨度的1/11,结构发生较大范围的局部倒塌;单根索破坏会引起个别相邻索在内力重分布过程中的应力放大2~4倍 ...
张微敬, 李鹏伟, 李永梅
doaj   +2 more sources

宁波国际会议展览中心大跨度钢结构设计

open access: yesJianzhu Gangjiegou Jinzhan, 2005
宁波国际会议展览中心主展厅大跨度屋盖支承条件复杂,风荷载效应显著。通过风洞试验确定屋盖的风压分布情况,在网壳结构的部分钢管中填充混凝土以平衡部分风吸力。采用抗震球形钢支座克服支座相对位移对屋盖结构产生的影响。小展厅和东、西展厅大跨度屋盖采用了主、次空间管桁架结构体系,在展厅中部设置了四肢钢管组合柱,从而有效地减小了屋盖的跨度与高度。为了适应大跨度屋面温度变形的要求,采用了滑板式聚四氟乙烯橡胶支座。
范重, 王春光, 尤天直
doaj  

考虑电-气-碳综合交易的跨国电网分散式电力调度—以规划的东北亚跨国电网为例 [PDF]

open access: yes全球能源互联网, 2019
为了实现跨国电网的有序发展与协调运行,跨国层面的电力交易、天然气交易和碳交易的有机结合十分关键。为此,以电力系统为核心,考虑天然气交易与碳交易的相关耦合因素,建立了跨国电-气-碳综合交易模型。在上述综合交易的框架下,建立了跨国电网的动态电力调度模型,以实现全局效益的最大化。进一步地,为了保护各个国家的工业信息隐私,提出了分散式的跨国电力调度算法,将全局优化问题转化为各个国家的子问题迭代求解,得到满足给定精度的全局最优解。最后,对东北亚跨国电网仿真算例进行测试,分析讨论在不同电-气 ...
杨青润   +4 more
doaj   +1 more source

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