Results 41 to 50 of about 4,313 (154)
Jianzhu Gangjiegou Jinzhan, 2021 设计了复式钢管混凝土钢梁半穿心加肋加腋型节点,制作了4个梁柱试件组合体进行低周往复加载试验,并采用ABAQUS有限元软件建立了节点数值分析模型。半穿心节点刚度较大,破坏模式主要为梁端塑性铰破坏,节点试件的滞回曲线呈明显的纺锤形,耗能性能较好,有限元分析结果与试验结果吻合较好。利用有限元模型研究了节点构造、几何参数和材料参数对半穿心节点的破坏模式和承载力的影响。参数分析表明:梁柱线刚度比及轴压比对节点初始刚度影响显著;轴压比和钢梁强度对节点极限承载力影响较大;而节点的变形能力受轴压比影响较大 ...
张玉芬 +3 more
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Analysis of internal load characteristics of damage cabin under near-field underwater explosion [PDF]
ObjectiveThis research aims to investigate the internal load characteristics of damaged cabins under near-field underwater explosion.MethodLoadings including high-speed fragment velocity of damaged outer plates, quasi-static pressure loads caused by ...
Haikun WANG +4 more
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Gaoya dianqi, 2022 特高压直流旁路开关是换流站中的关键设备，为评估某±800 kV特高压旁路开关的抗震性能，文中建立了旁路开关设备的有限元模型，并对其进行了动力特性和地震响应分析，确定设备抗震薄弱位置和关键响应，采用对数正态分布拟合旁路开关不同损伤状态下的易损性曲线。结果表明，旁路开关设备存在两处薄弱点，即支柱绝缘子根部、旁路开关顶部，相应的破坏模式分别为支柱绝缘子根部强度破坏与旁路开关顶部牵拉破坏。PGA大于0.2g时，旁路开关主要破坏模式为绝缘子根部破坏。支架对旁路开关地震响应有显著的放大作用 ...
汤培森, 薛志航, 谢强
doaj
Mechanical properties and permeability characteristics of mudstone-slag-based water barrier material [PDF]
To investigate the influence of mudstone content and curing age on the mechanical properties and permeability characteristics of mudstone-slag-based water barrier materials, using waste sandstone from open pit coal mine stripping was used as aggregate ...
Jiangsen ZHU +6 more
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Jianzhu Gangjiegou Jinzhan, 2020 对武汉天河机场T3航站楼屋盖结构中2个典型内置横向插板加强空间相贯节点的受力性能进行了足尺破坏试验和有限元模拟研究,分析了两节点的破坏模式和应力变形发展过程,试验和有限元结果表明:2个试验节点均具有较高的安全储备,其破坏模式均为受压支管根部局部屈曲破坏。有限元软件可以较好地模拟节点的加载过程,两节点中插板的存在可提高其极限承载力,但对各自主管应力状态的影响不同,JD2试件中插板可有效改善其主管的应力集中现象,JD1试件中插板对其主管应力状态的影响较小。
郭杰 +5 more
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Numerical study on the mechanism of shear performance degradation of thawing glacial debris [PDF]
The sensitivity of the ice-water transition in glacial debris to temperature rise has become a significant concern. In recent years, there has been an increase in reports of ice avalanches caused by the thawing of glacial debris, which can be attributed ...
Da HUANG +4 more
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Jianzhu Gangjiegou Jinzhan, 2019 通过对多层钢框架进行增量动力分析,研究柱脚转动刚度、底层破坏模式以及钢柱宽厚比对多层钢框架抗震性能的影响,具体从结构倒塌储备系数、地震易损性以及结构局部响应考察各影响因素对结构抗震性能的影响。分析结果表明,当破坏模式由钢柱破坏控制时,随着钢柱宽厚比的增大结构抗震性能减弱,考虑柱脚刚度的半刚接柱脚钢框架地震易损性与刚接柱脚钢框架差别较小,当柱脚与柱刚度比为2.0时,框架地震易损性与刚接柱脚钢框架非常接近;当破坏模式由柱脚破坏控制时,可以明显降低钢柱宽厚比的要求。
崔瑶, 刘浩, 王枫智, 山田哲
doaj
Jianzhu Gangjiegou Jinzhan通过10组轴压试验对双剪拼接角钢主材的轴心受力性能进行了研究，探究了不同节点螺栓连接长度（120 mm、180 mm、240 mm）和包钢面积比（1.08、1.22、1.31）对拼接角钢主材轴心受力性能的影响，从试验构件的受压极限破坏模式、极限承载力和荷载-位移曲线三个方面展开了对比分析，研究表明：当角钢主材无拼接节点时，其轴压极限破坏模式表现为跨中截面处发生绕主轴的弯扭屈曲破坏，平面外变形最大，扭转变形小；当角钢主材采用双剪拼接节点时，其轴压极限破坏模式分为两种情况 ...
李杰 +6 more
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Numerical simulation of complete instability process of shield tunnel excavation face based on SPH method [PDF]
Given the limitations of traditional grid-based numerical methods in simulating large deformation problems of geotechnical materials, this paper applies a meshless numerical method—Smoothed Particle Hydrodynamics (SPH)—to a full process simulation of ...
MA Yangchen1 , WENG Xiaolin1, SUN Yufeng1 , YE Fei1, MA Yue2, WONG K K Henry3, PARDOEN Benoît3
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Analysis of the Incipient Failure During Outburst of Coal and Gas [PDF]
, 2008 针对煤矿煤与瓦斯突出动力现象的复杂过程,对突出启动前煤体的初次破坏特征进行了分析。特别是对影响突出发生的煤体初次破坏的几何特征以及层裂拱壳形成的力学原理,通过简化的力学模型做了分析,同时讨论了影响初次破坏特性的主要因素,包括与不同煤体结构相适应的煤体材料不同破坏准则的影响。为进一步认识煤与瓦斯突出的机理,突出的启动、发展演化提供一种思路 ...
张均锋, 韩小波
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