Results 51 to 60 of about 3,029 (144)
波形钢腹板钢管混凝土模型拱面内极限承载力试验研究 [PDF]
, 2010 进行了波形钢腹板钢管混凝土模型拱的面内两点非对称和对称加载试验。对模型拱的挠度、钢管应变、波形钢腹板应变、极限承载力等进行了分析。试验结果表明:波形钢腹板钢管混凝土拱是一种受力性能很好的新型组合拱。在这种结构中,波形钢腹板与钢管混凝土弦杆均能发挥其各自的优势。它与钢管混凝土单圆管和哑铃形拱相比,刚度与承载力有了很大提高;与钢管混凝土桁拱相比,避开了节点破坏问题,模型拱呈总体破坏特征,从而使其延性与极限承载力明显提高。有限元分析表明:在承载力分析中应考虑双重非线性的影响 ...
陈宝春, 高婧
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Subsection amplification cyclic deterioration mechanism of creep damaged coal [PDF]
Under the excavation effects of deep coal and rock, obvious creep damage is produced under the action of high stress for a long time and the sudden destabilization of the creep-damaged coal body induces rock burst disaster under the mining action in ...
Baotang SHEN +5 more
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Guangtongxin yanjiu, 2011 用时域有限差分（FDTD）法和快速傅里叶变换（FFT）方法计算了二维正方格子光子晶体的点缺陷的谐振频率,研究了点缺陷的半径和背景材料折射率的变化对谐振频率的影响。研究结果表明,谐振归一化频率随点缺陷的半径或背景材料折射率增大而减小,当点缺陷半径增大到0.45r时,谐振中心归一化频率为0.336,波导微腔传输系数最大为98.02%。
高永锋, 周明
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Jianzhu Gangjiegou Jinzhan, 2021 冷成型钢构件在经历火灾(高温)后,力学性能可能发生衰减,需要关注其承载力的变化并做出准确评估。因此,在现有高强冷成型钢过火后材性与构件测试结果的基础上,通过数值仿真模拟预测构件经历不同温度后的力学行为。通过参数分析,开展开口截面承压构件过火后性能分析,研究高温后的构件长细比、截面形式对承载力和破坏模式的影响,评估常温构件设计方法的适用性。有限元建模和参数分析的结果表明:(1)冷成型钢构件材性的衰减不是影响其过火后性能的唯一因素,在特定温度段须考虑重量折减;(2 ...
张佳慧, 孙梦茹
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Predicting bearing capacity of gently inclined bauxite pillar based on numerical simulation and machine learning [PDF]
Pillar strength is significantly affected by inclination, making accurate prediction of inclined pillar strength crucial for the safety of underground quarries in inclined ore bodies.
Biaobiao YU +3 more
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Jixie chuandong, 1992 在编制滚子链额定功率曲线的过程中,所做的大量疲劳试验是在高频疲劳试验机上进行的,且采用的试样均是以5个链节组成的滚子链链段,链段的两端是内链节。本文应用威布尔分布理论,根据由5个链节组成的链段的疲劳试验数据推算出了链条工作边（40个链节）的疲劳性能折减系数。并对试验数据是否符合威布尔分布进行了相关性检验。
孟祥宾, 王义行
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Sustainable affordable housing for rural migrants in Guangzhou. [PDF]
, 2010 Yiu Kam Po, Vince."Architecture Department, Chinese University of Hong Kong, Master of Architecture Programme 2009-2010, design report.""May 2010."Includes bibliographical references (p.
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, 1994 应用ＷＥＡＰ程序;针对我国海洋工程中常用的桩及施工机器和海区地质情况进行波动理论沉桩分析;得到了各参数变化对沉桩能力影响的关系曲线;绘出了各参数值与实测值的偏差对沉桩能力产生影响的范围值．所有参数中 ...
江礼茂, 谢小鹏
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Stability analysis of expansive soil landslide based on homogenization theory and upper limit analysis [PDF]
Under the forces of expansive soil and landslides, the construction of the tunnel entrance is more likely to cause engineering disasters, such as surface cracking and landslides. The application of micro piles in the tunnel has advantages over anti slide
Dongqing WANG +3 more
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Guangtongxin yanjiu, 1988 本文介绍利用现有MCVD工艺制备大芯径、大数值孔径光纤预制棒的新工艺。在不掺硼的情况下,在预制棒芯层逐层减少SiCl4的流量,解决了为达到较高折射率差△n,在芯层掺锗过多,而引起光纤预制棒在沉积后期和缩棒过程中由材料的热膨胀系数而导致的炸裂问题。并通过改变火焰平移速度,提高了沉积速率,缩短了制棒时间。所拉制的光纤,数值孔径NA高达0.30。
汪庆样, 张穆
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