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Application of Improved Kalman Filter Approach in Damage Detection of Frame Structure Considering Beam-to-Column Joints Damage [PDF]
, 2013 目前关于框架结构损伤诊断的研究大部分都着眼于框架结构梁柱单元的损伤，而实践证明，在地震荷载、暴风荷载或者长期荷载作用下，框架结构在梁柱连接节点处更容易发生损伤，因此节点损伤识别越发显示其重要性。然而对于复杂结构，其有限元模型存在大量的自由度，因而进行结构损伤识别时相应的计算量也会加大。论文在分析并总结了目前国内外结构节点损伤识别的研究进展基础上，用静力凝聚的方法将考虑梁柱节点作用的有限元模型进行简化，在文章的第一部分将静力凝聚方法同扩展卡尔曼滤波算法相结合，应用于考虑节点损伤的框架结构损伤诊断中 ...
李青
core
Using online reports of seahorse seizures to track their illegal trade
Conservation Biology, Volume 39, Issue 5, October 2025.Abstract Illegal wildlife trade (IWT) is a persistent and extensive threat to global biodiversity. Hundreds of marine fish species are subject to regulation under the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES), but it is unclear how much protection species gain from CITES because information on marine fish ...
Sarah J. Foster +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2021 为了研究部分包裹混凝土组合(PEC)柱(弱轴)与型钢梁对穿高强螺栓端板连接节点的抗震性能,考虑端板厚度、盖板厚度以及节点构造形式3个参数,设计了两种不同构造的梁柱节点,对其进行低周往复荷载试验和有限元模拟,分析了各设计参数对试验节点滞回性能、承载能力、节点刚度、延性和耗能能力等指标的影响。研究结果表明:盖板厚度由14mm增加至16mm时,节点承载力提高了33.91%,初始刚度提高了14.9%,延性降低了18.9%;端板厚度由12mm增加至14mm时,节点承载力提高了19.93%,初始刚度提高了15.1%,
赵根田 +5 more
doaj
, 2011 为了减轻行星齿轮减速器的重量,提高承载效率,取行星齿轮减速器的太阳轮和齿圈的齿数、模数和齿宽为设计变量,以减速器体积最小化为优化目标,利用MATlAb优化工具箱对行星齿轮减速器进行优化设计计算。计算结果表明 ...
侯亮, 邹毅
core
Community perceptions of invasive species and environmental management in a US island territory
Conservation Biology, Volume 38, Issue 6, December 2024.Abstract Environmental managers struggle with communicating accurate and relevant information and with gaining trust from the communities they serve, problems that are especially pronounced in minority and colonized communities. An important step in developing successful management strategies is partnering directly with the communities involved, but ...
Ann Marie Gawel +2 more
wiley +1 more source
An assessment of potential interventions to reduce the totoaba illegal trade market
Conservation Biology, Volume 38, Issue 5, October 2024.Abstract The illegal trade in totoaba (Totoaba macdonaldi) is causing adverse social, ecological, and economic impacts. This illegal activity is accelerating the overexploitation of totoaba and pushing the critically endangered vaquita (Phocoena sinus) closer to extinction.
Rodrigo Oyanedel +3 more
wiley +1 more source
Conservation Biology, Volume 38, Issue 3, June 2024.Abstract Reintroduced populations are typically considered to progress through establishment, growth, and regulatory phases. However, most reintroduction programs do not monitor intensively enough to test this conceptual model. We studied population indices derived from track activity of 4 threatened species (greater bilby [Macrotis lagotis], burrowing
Katherine E. Moseby +3 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2018 铝合金板式节点网壳是一种典型的半刚性节点网壳。采用ANSYS有限元软件对铝合金板式节点网壳弹塑性稳定性能进行了有限元分析。建立了考虑节点刚度的杆件单元模型。采用Combin39单元对节点非线性弯曲刚度进行模拟。分析了节点刚度对网壳失稳模态、应力分布和极限承载力的影响。研究发现,节点的非线性弯曲刚度对网壳整体稳定性能具有削弱作用,其削弱作用随着网壳矢跨比的减小而加大。最后,为了了解节点刚度四折线模型中各参数对网壳稳定性能的影响而进行了参数分析。研究表明,网壳极限承载力随着滑移弯矩和嵌固刚度的减小而降低 ...
熊哲 +4 more
doaj
Jianzhu Gangjiegou Jinzhan, 2022 利用有限元软件ABAQUS模拟混合联肢部分外包组合剪力墙-钢连梁刚接节点在单调加载条件下的受力情况，并进行变参数有限元模拟。基于有限元模拟结果，研究该刚接节点的破坏模式，建立节点极限承载力的理论模型和计算公式。研究表明，混合联肢部分外包组合剪力墙-钢连梁刚接节点的极限承载力主要由以下5部分组成：节点核心区型钢腹板剪切强度、节点核心区翼缘框剪切强度、节点核心区内部混凝土斜压杆抗压强度 ...
陈锘, 石韵, 苏明周, 贺小刚
doaj
Jianzhu Gangjiegou Jinzhan为研究特高压输电钢管塔C型插板连接的典型节点面外抗弯性能，进行了10个足尺K形节点面外抗弯承载力试验，研究了插板厚度、节点板厚度和螺栓颗数对节点面外抗弯性能的影响。在此基础上，建立了节点有限元有效模型并进行了参数分析，考察了插板与节点板厚度、螺栓颗数与螺栓直径、主管径厚比、斜管径厚比以及钢材强度对节点面外抗弯刚度的影响，提出了此类节点面外抗弯刚度的建议计算公式。研究结果表明：（1）在所有试验工况中，插板和节点板厚度引起的节点初始转动刚度值最大增幅为40.28%，螺栓颗数引起的节点初始转动刚度值最大增幅为
陈志辉 +5 more
doaj +2 more sources