Results 11 to 20 of about 15,531 (185)
Dizhen xuebao, 2022 目前城市核心区交叠紧邻的隧道群大量涌现，其抗震安全性问题日益突出，但近邻隧道之间以及与地层的动力相互作用机制尚不清晰。本文针对饱和地层浅埋平行隧道，基于Biot两相介质理论，采用边界积分方程法分别建立了饱和地层水平和竖向双线隧道动力作用分析模型，并与典型算例精确解对比验证了本模型的有效性；在此基础上，研究了SV波入射频率变化和双线隧道间距变化对隧道结构及周围地层孔隙水压力的影响机制，并以单条隧道分析结果为参照进行对比分析。结果表明：相比单条隧道，相邻隧道的存在改变了既有隧道的动力响应特征 ...
Haitao Yu +3 more
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基于数值子结构方法的防屈曲支撑高层钢结构地震动力分析 [PDF]
, 2018 近年来,高层建筑结构地震动力响应分析成为一个热点问题。防屈曲支撑构件(BRB)承载力高,延性与滞能性高,在强震作用下具有良好的耗能性能,正日益普及并用于高层建筑结构。高层建筑结构在地震作用下的失效往往是由部分关键构件损坏引起,而其他大部分构件仍处于弹性或小变形状态。采用常规的整体建模分析和Newton-Raphson迭代方法(NR)效率较低,而数值子结构方法将结构中进入强非线性状态或者发生严重损伤的构件进行隔离并精细化模拟,使大规模的非线性计算转化为主结构的线弹性分析和子结构的非线性分析 ...
古泉, 林纯
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Analytical solution for dynamic interaction of end-bearing pile groups subjected to horizontal dynamic loads [PDF]
An analytical model for the "pile-soil-pile" horizontal interaction in pile groups that accounts for the scattering effect of the receiver pile is presented in this study based on the plane strain model, to modify the calculating theory for closely ...
ZHENG Changjie1, 2 , CUI Yiqin1, 2, DING Xuanming3, LUAN Lubao4
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Dizhen xuebao, 2018 基于曲线网格有限差分方法研究了垂直走滑断层在不同山体地形情况下的动力学破裂传播，分析并讨论了局部山体地形对断层破裂过程及相应地面地震动的影响，得到了各模型断层面的动力学破裂过程及相应的地表峰值速度特征。研究结果表明，山体地形尺度（山体高度及底部延展距离等）对断层动力学破裂过程影响较大，进而影响到相应的地面地震动分布。当山体地形处于自由地表上亚剪切向超剪切转换的位置附近时，山体地形会阻碍断层面上自由地表超剪切的产生。一般而言，对于具有一定埋深的断层，当山体地形底部延展距离一定时，山体高度越高 ...
Mingfeng Wang +3 more
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The Research on Wind-induced Vibration Control of Large Span Roof Structures with Different Damping Systems and Optimization of MTMD Damping System [PDF]
, 2016 近年来，随着国内经济实力的增强和社会发展的需要，大跨空间结构在我国得到迅速发展，且跨度越来越大。由于大跨空间结构具有质量轻、阻尼小、柔性大、自振频率低等特点，因而对风荷载的作用很敏感。在风荷载的作用下，结构会产生较大的变形，严重降低结构的安全性和舒适性。为抑制结构的动力响应，学者们提出在结构适当位置处安装控制装置的概念。目前，高层建筑在风荷载作用下的振动控制研究已取得丰硕成果，并有大量的工程应用实例。然而，国内外学者对大跨空间结构的风振控制研究相对较少，因此有必要开展大跨空间结构的风振控制研究 ...
邵辉
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Study on dynamic response characteristics of ground fissure sites in Songzhuang, Beijing [PDF]
Ground fissure disasters pose significant threats to the safety of residential areas and urban-rural planning in localized areas of Beijing. To analyze the impact of ground fissure activity on the dynamic response characteristics, patterns, and scope of ...
Chao LI +9 more
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People and Nature, EarlyView.Abstract Currently, scholarship on education to foster connectedness with nature primarily focuses on children. As adults likewise face the disconnection from nature and play a key role in influencing children, it is important to understand how they perceive, engage in, and benefit from relevant programmes.
Xiaoxue Chen, Zuyi Lyu, Junxi Qian
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Analysis on the response of the dip slope with weak layer to earthquake [PDF]
Taking the down-slope with weak strata in the south of Fushun west open-pit mine as the reference prototype, numerical simulations of the down-slope with weak strata were conducted through FLAC3D software, which included the simulation of actual ground ...
Laigui WANG +3 more
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Dynamic Analysis of a High-rise-Building Structure during an Earthquake Considering Soil-Structure-Interaction [PDF]
, 2017 土－结构体系有限元模拟计算分析的复杂性与计算成本，在一定程度上限制了土与结构相互作用分析在高层建筑结构设计中的应用。上部结构数值解与土解析解耦合的土－结构相互作用计算方法，为高层建筑结构提供了有效途径。利用作者提出的耦合算法，对一个钢框架-混凝土核心筒高层结构进行地震作用下的非线性动力分析,讨论了不同强度地震和不同种类地基土对结构地震反应的影响，得出了对实际工程具有指导性意义的结论。The conventional coupling analysis based on a comprehensive ...
卢佳盛, 孙宝印, 李勇
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Rare Metals, EarlyView.ABSTRACT Porous NiTi alloys are widely used in biomedical and engineering fields. Using the PBF‐LB technique, the TPMS and Voronoi porous parts with a porosity of ∼67% and a minimum feature size of 0.15 ± 0.02 mm were fabricated. Although the bulk sample fabricated with the same parameters is defect‐free, μ‐CT reconstruction on the porous sample ...
Wen‐Hao Zeng +7 more
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