Jianzhu Gangjiegou Jinzhan, 2018 为研究椭圆钢管混凝土(ECFST)长柱的偏压性能,利用ABAQUS建立了偏压作用下椭圆钢管混凝土长柱的数值分析模型,考虑了钢管与核心混凝土的复杂接触问题、材料非线性问题和椭圆截面特征的影响,并利用试验结果验证了数值分析模型的准确性。对钢材强度、混凝土强度、偏心距、径厚比、长短轴比和截面面积等参数进行了分析,评价了各参数对偏压作用下椭圆钢管混凝土长柱轴压承载力的影响,揭示了其破坏模式和受力机理。研究结果表明,偏压作用下椭圆钢管混凝土长柱的破坏模式根据偏心距大小可以分为大偏压破坏和小偏压破坏 ...
於忠华, 王静峰, 沈奇罕
doaj
, 2011 以激光辐照对热障涂层面层进行局部加热,模拟超燃冲压发动机燃烧室热障涂层服役的高热流、高温度梯度载荷环境,研究热障涂层的可能破坏模式.首先给出了YAG激光局部加热试验方法、过程和界面破坏的典型形貌;然后,基于理论分析与有限元模型化研究,计算了表面局部受热时热障涂层体系的温度场、变形场和应力场,分析了热障涂层破坏的力学机制.研究结果表明,在这种局部迅速加热的载荷条件下,热障涂层将由于陶瓷层-粘接层的界面分层断裂而失效.参数化模型研究发现热障涂层体系的关键结构参量 ...
吴臣武, 陈光南, 黄晨光
core
Experimental study on progressive failure of anchoring structure under high-frequency and low-energy impact disturbance [PDF]
High-frequency, low-energy impacts consistently inflict damage on the surrounding rock and anchoring structure in deep roadways, leading to ongoing instability. The construction of anchoring support system that can withstand these dynamic impact loads is
Jiaguang KAN +5 more
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Study on macro-and mesoscopic damage characteristics of fractured sandstoneunder cyclic loading and unloading with variable upper limit [PDF]
: In order to study the macro and micro damage characteristics of fractured rock mass under cyclic load, cyclic loading and unloading tests with variable upper limit were carried out to analyze the mechanical properties and macro failure characteristics ...
Guangjian LIU +6 more
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Analysis on factors controlling shallow failures of the cut slopes and its prevention by bio-engineering measures: A case study of the cut slopes along the highway from Shuangcheng to Dajiali [PDF]
Understanding the primary and secondary relations of influencing factors is crucial for predicting deformation and controlling collapse in cutting slopes. Using a cutting slope along the Shuangcheng to Dalijia expressway in Gansu Province as the research
Changgen YAN +4 more
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Mechanism analysis on anisotropic degradation of sandstone in freeze thaw environment based acoustic emission [PDF]
In the freeze-thaw environments, the fracturing of bedding rock poses a significant threat to the stability of the projects in cold regions, leading to potential engineering accidents.
Bing LIU +4 more
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Jianzhu Gangjiegou Jinzhan结合钢筋混凝土结构和钢结构的优势，设计一种型钢-螺栓-后浇混凝土装配式剪力墙型钢混合连接。基于ABAQUS有限元软件建立混合连接的剪力墙模型，探究低周往复荷载作用下该混合连接预制剪力墙的受力性能，主要分析模型的破坏形态、受力机制、变形曲线、特征承载力等，并扩展分析了材料强度、轴压比、连接件数量、型钢截面高度等参数对模型受力性能影响。结果表明：装配式剪力墙破坏形态为压弯破坏，破坏时钢连接件仍保持完整，符合“强连接，弱墙肢”的基本设计理念；装配式剪力墙具有较好的承载力、延性和刚度；轴压比对结构承载力影响显著，
袁玉杰 +3 more
doaj
Jianzhu Gangjiegou Jinzhan, 2008 本文利用LS-DYNA软件对同冲量不同超压峰值不同时间的三种荷载工况下钢-混凝土组合梁的动力响应及破坏模式进行了研究对比,并对梁的变形过程、关键位置点的位移、速度、支座剪力和跨中弯矩进行了详细的分析。结果表明,在爆炸冲击波下,开始阶段混凝土板对钢梁有很好的保护作用,但混凝土易于破碎,钢-混凝土组合梁容易丧失共同工作的能力,剪切破坏是钢-混凝土组合梁的一种重要破坏形式。
杨涛春, 李国强
doaj
一种渗流吸水诱发岩体强度弱化的有限体积数值计算方法 [PDF]
, 2018 传统的渗流数值计算方法难以较真实地描述岩石材料性能劣化和渗透性演化机制。该文提出了一种渗流吸水诱发岩体强度弱化的有限体积数值计算方法。利用高斯散度定理采用有限体积法求解水在岩体中的渗流过程及岩体的变形破坏过程,建立了基质吸水引起岩体模量及强度弱化的理论模型及相应的数学表述。基于考虑吸水弱化算法的各向同性孔隙渗流模型,模拟了低、高两种边界流体压力下某粉砂岩试样的吸水软化过程和不同吸水时间下试样的单轴压缩过程。数值算例表明:边界流体压力越高,试样达到整体饱和状态的时间越快;渗流初期以自由水渗流填充孔隙为主 ...
冯春 +5 more
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Construction of three-dimensional model and stability analysis of dangerous rock mass based on nap-of-the-object photogrammetry and LiDAR technology [PDF]
The collapse of high-steep dangerous rock is a common geological disaster in the mountainous areas of China. However, due to the limitation of objective factors such as traffic difficulties, the efficiency of artificial geological exploration is low and ...
Bolin HUANG +5 more
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