Results 11 to 20 of about 288 (80)
Jianzhu Gangjiegou Jinzhan, 2010 结构整体和构件的初始几何缺陷是结构产生非线性行为的影响因素之一,在目前的高等分析中常按最不利的缺陷分布来考虑它们的影响。采用蒙特卡罗法可以考虑初始几何缺陷的随机遇合问题,能更加合理地确定初始缺陷的分布规律。通过统计分析得到柱顶侧移和梁跨中挠度的概率密度函数,可由此确定框架可能的最大变形。某一六层单跨框架的计算结果表明:当按缺陷的最不利分布来施加不同的初始几何缺陷时,对框架的极限承载力影响不大,但对框架的侧向变形影响较大:初始几何缺陷越大,框架的最终变形也越大。但按蒙特卡罗法考虑不同的初始缺陷时 ...
金路, 张耀春, 赵金友, 邵永松
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Jianzhu Gangjiegou Jinzhan, 2003 <正> 本文研究了由连续弹簧支撑的有几何缺陷的单层方网状平扁球形壳体的非线性屈曲特性。壳结构上施加了均匀的竖向荷载,壳体的横向位移假设有同样模式的缺陷,但是没有假设特定的模式。用反复渐进方法,基于作者提出的理论模式提出了一个解析方法。外部荷载和中心横向绕度的无量纲结果可方便的用于分析结构的非线性特性和通过变化参数（如:弹簧刚度、缺陷系数和边界情况等）来估计屈曲特性,并将范例数据和有效的结果进行比较,得出了几个系数的作用效果。
方明霁
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Jianzhu Gangjiegou Jinzhan高大施工支架是大跨度复杂桥梁工程中常用的钢结构支撑系统。实际工程中由于受到高大施工支架加工安装误差、超限受力或不均匀受力等因素影响，因此钢结构施工支架存在节点连接不牢固、杆件弯曲变形等初始缺陷。为明确初始缺陷对桥梁高大施工支架整体稳定性能的影响规律，首先开展了桥梁高大施工支架的线性屈曲分析，进而探讨了节点半刚性、杆件初弯曲等初始缺陷对桥梁高大施工支架极限承载力的影响规律。为提高桥梁高大施工支架极限承载力的求解精度，引入刚度系数来衡量节点半刚性，综合考虑节点体对杆件计算长度的影响 ...
唐永 +5 more
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Jianzhu Gangjiegou Jinzhan, 2009 本文先建立四个有初始几何缺陷的框架结构,通过有限元分析分别得到这四个框架的竖向极限荷载Pcr和水平极限荷载Hcr;再对与这四个框架几何及截面相同但没有初始缺陷的框架,用之前计算得到竖向和水平极限荷载分别按一阶弹性分析和二阶弹性分析得到其内力,用我国现行《钢结构设计规范》(GB50017)中压弯杆件极限承载力验算式计算其名义应力,并与实际结果比较。结果证明,进行钢框架压弯杆件平面内稳定验算时,对框架采用二阶弹性分析,并将柱的计算长度取为实际柱长,所得验算结果较对框架采用一阶弹性分析 ...
王翼, 李国强
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Quality control and safety management of oil and gas pipelines during its whole life cycle [PDF]
, 2023 The development history and technical change of oil and gas pipeline quality management in China were reviewed focusing on pipeline quality control in the whole life cycle, on the basis of quality improvement of oil and gas pipelines in the construction ...
Changliang JIANG
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Application advances of artificial intelligence algorithms in dynamics simulation of railway vehicle [PDF]
, 2021 The application examples and domestic and foreign literatures using artificial intelligence algorithm for railway vehicle system dynamics simulation were reviewed.
Deng, R +5 more
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Process design based on active residual stress control of H-beams during a straightening process [PDF]
, 2016 Aiming at the active residual stress control of H-beams during a roller straightening process,an analysis model of stress evolution during the straightening process is constructed based on the elastic-plastic theory.
GUAN Ben +4 more
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Bearing performance of wallboards in an electrostatic precipitator casing in consideration of stressed skin effect [PDF]
, 2016 For a wallboard in an electrostatic precipitator casing playing stressed skin effect under vertical uniform pressure on the top, the failure mode and bearing capacity were investigated by nonlinear finite element method.
PAN Li-cheng +5 more
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Developmental Medicine &Child Neurology, Volume 61, Issue 3, Page E1-E35, March 2019., 2019 目的 本国际临床指南由欧洲残疾儿童学会（the European Academy of Childhood Disability，EACD）牵头制定，旨在解决发育性协调障碍（developmental coordination disorder，DCD）的定义、诊断、评估、干预以及与社会心理方面的临床应用关键问题。 方法 本指南针对五个领域的关键问题，通过文献综述和专家团队的正式讨论达成共识。为保证指南的循证基础，以“机制”、“评估”和“干预”为检索词, 对2012年更新以来提出的最新建议以及新增的“社会心理问题”和“青少年/成人”为检索词进行检索。根据牛津大学循证医学中心证据等级 (证据水平 [level of evidence, LOE]1–4) 将结果进行分类，最终转化为指南建议。并由国际 ...
Jing Hua +6 more
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Distributed dislocation-residual stress model of cold rolled strips based on the complex variable function method of plane elasticity [PDF]
, 2016 In order to reveal the formation mechanism of the manifested waves of cold rolled strips,the distributed dislocation was calculated by using measured residual stress,and a distributed dislocation-residual stress model was proposed. The stress field of an
CHU Yu-gang +5 more
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