Results 51 to 60 of about 4,313 (154)
Effect of various primers on the long-term bond strength to zirconia [PDF]
Objective To compare the effects of 10-methacryloyloxydecyl dihydrogen phosphate (10-MDP)- and silane-based primers with those of MDP-based primers on zirconia-resin bonding via multiple levels of aging. Methods Zirconia blocks were divided into 4 groups
ZHAO Li, ZHAO Ke
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Mechanism of bending-sideslip of inclined thick bedding slope: A case study of Qingkou landslide in Wulong, Chongqing [PDF]
The Qingkou landslide in Wulong, Chongqing, has developed on an inclined thick abrupt cliff, with a large area of goaf formed due to hundreds of years of coal mining below.
Junzhi LIN +3 more
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Jianzhu Gangjiegou Jinzhan, 2020 为了研究一种新型装配式梁板集成组合楼盖中双肢拼合热轧槽钢梁的受弯性能,通过有限元软件ABAQUS对拼合梁进行数值分析,考察了螺栓间距、螺栓预紧力、螺栓种类和螺栓布置方式对双肢拼合热轧槽钢梁的破坏模式和极限受弯承载力的影响。结果表明:试件极限受弯承载力低于同截面整梁,且其破坏模式均为弯扭失稳破坏;双肢拼合热轧槽钢梁的极限受弯承载力与单槽钢梁相比具有"1+1≥2"的拼合效应;螺栓间距对双肢拼合热轧槽钢梁的承载力影响较大,而螺栓预紧力、螺栓种类和螺栓布置方式对其影响较小。
郁有升, 张子露
doaj
Mechanical properties and deformation damage characteristics of deep rock under unloading and compensation paths [PDF]
To study the effect of stress compensation on the mechanical properties and deformation damage characteristics of unloading sandstone, a true triaxial perturbation unloading rock testing system was used to carry out unloading experiments on sandstone ...
Chongyan LIU +4 more
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Jianzhu Gangjiegou Jinzhan为研究不锈钢槽式预埋组件在剪力作用下的破坏模式和承载性能，完成了3组9个带混凝土基材的不锈钢槽式预埋组件试件的受剪试验。试验结果表明，平行受剪工况下破坏模式为齿牙剪切破坏，垂直受剪工况下破坏模式为混凝土边缘破坏及槽道卷边受弯破坏。在试验的基础上，通过ABAQUS软件建立了有限元分析模型，并验证了模型的准确性。通过数值分析研究了齿牙尺寸、混凝土强度、边缘距离、锚件中心线间距及预埋槽道有效埋深等参数对极限承载力的影响。结果表明，平行受剪工况下，平齿型槽道的齿牙数量、宽度及厚度的增加均可提高极限承载力 ...
郑勇 +5 more
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Analysis of stability and kinematics of the dangerous rock mass in Zhangjiagou, Baoxing, Sichuan Province [PDF]
After the “6 • 1” Lushan earthquake, unstable rock mass was discovered in Zhangjiagou, posing a severe threat to the safety of the residents and their property below.
Bo ZHONG +5 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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Jianzhu Gangjiegou Jinzhan, 2023 为研究冷弯厚壁卷边槽钢在轴向滞回荷载作用下的抗震性能，选取了9根壁厚分别为3 mm、8 mm、12 mm和16 mm的冷弯卷边槽钢进行轴向滞回加载试验。通过试验得到荷载-位移滞回曲线，研究长细比、宽厚比、钢材强度等因素对构件抗震性能的影响，并讨论了黏滞阻尼系数、延性系数、刚度退化等问题。研究结果表明：宽厚比、长细比会影响构件的破坏模式，而不同破坏模式又影响构件的抗震性能，如宽厚比或长细比较大的构件会出现不同的失稳破坏模式，导致其拉、压区承载力峰值相差较大，滞回曲线不饱满，总体抗震性能较差；反之 ...
付小超, 温东辉, 李元齐
doaj
Jianzhu Gangjiegou Jinzhan, 2023 螺纹锚固单边螺栓锚固于带螺纹的螺栓孔。螺纹锚固单边螺栓无需螺母，能够实现单侧安装，因此非常适用于闭口截面钢构件的连接。了解不同结构在火灾后的受力性能具有重要的工程意义，能够为受火结构的鉴定和修复提供依据。通过试验研究了螺纹锚固单边螺栓连接节点在火灾后的性能，试验中采用全过程的加载方式，模拟了火灾从开始到结束的过程，并考虑了火灾发生时节点承受的荷载大小和火灾温度对于其火灾后残余力学性能的影响。试验结果表明，螺纹锚固单边螺栓连接节点共有两种破坏模式，分别为钢管壁屈服破坏和T形板翼缘屈服伴随螺栓破坏 ...
闵凡文 +5 more
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Shear characteristics and mesoscopic damage mechanism of long time soaking red sandstone under loading and unloading conditions [PDF]
The bank slope rock mass below the flood control restricted water level (145 m) in the Three Gorges Reservoir area has experienced long-term immersion in the process of reservoir water lifting and lowering; the water level changes lead to the rock mass ...
Binghao ZHOU +4 more
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