采用压电阻抗技术(EMI)对三层钢框架进行了损伤模拟实验,通过拧松钢框架节点的螺栓来模拟损伤,测试了钢框架在不同损伤程度下的电导纳值.并采用均方差(Root Mean Square Deviation,RMSD)、协方差(Covariance)和均方根(Root Mean Square,...采用压电阻抗技术(EMI)对三层钢框架进行了损伤模拟实验,通过拧松钢框架节点的螺栓来模拟损伤,测试了钢框架在不同损伤程度下的电导纳值.并采用均方差(Root Mean Square Deviation,RMSD)、协方差(Covariance)和均方根(Root Mean Square,RMS)作为损伤程度参数指标对实验数据进行了分析,验证了利用压电阻抗技术进行结构健康检测的有效性,表明RMSD指标对反映结构损伤程度更准确可靠.展开更多
在500 k V变电构架的设计中,目前国内人字形构架柱和单钢管悬臂支架柱应用较为成熟,角钢格构式变电构架应用较少。在海外工程中,角钢运输具有较大优势。结合实际工程,以埃塞俄比亚某500 k V变电构架为实例,通过根开的有效组合,对21种不...在500 k V变电构架的设计中,目前国内人字形构架柱和单钢管悬臂支架柱应用较为成熟,角钢格构式变电构架应用较少。在海外工程中,角钢运输具有较大优势。结合实际工程,以埃塞俄比亚某500 k V变电构架为实例,通过根开的有效组合,对21种不同根开的变电构架进行了全面的计算,以用钢量和混凝土用量为依据进行工程造价比较分析,得出了类似工程条件下的最优根开,以指导工程设计。当构架柱高约为30 m时,结合构架所处地理位置气候等条件,最优根开建议值为6.1 m×3.1 m,即长向根开约取为柱高的1/5,短向根开约取为柱高的1/10时,结构整体力学性能较好且最为经济。展开更多
The geocentric coordinates of three mobile sites including Fangshan in Beijing, Urumqi in the Xinjiang Uy-gur Autonomous Region and Lhasa in Tibet are determinedin the ITRF2000 frame by means of both the global SLRdat...The geocentric coordinates of three mobile sites including Fangshan in Beijing, Urumqi in the Xinjiang Uy-gur Autonomous Region and Lhasa in Tibet are determinedin the ITRF2000 frame by means of both the global SLRdata and the mobile (SLR) data obtained by a mobile satel-lite laser ranging (SLR) apparatus from Aug. 2000 to Dec.2001. The results showed that the geometrical performance of Chinese SLR network has been significantly improved.展开更多
文摘采用压电阻抗技术(EMI)对三层钢框架进行了损伤模拟实验,通过拧松钢框架节点的螺栓来模拟损伤,测试了钢框架在不同损伤程度下的电导纳值.并采用均方差(Root Mean Square Deviation,RMSD)、协方差(Covariance)和均方根(Root Mean Square,RMS)作为损伤程度参数指标对实验数据进行了分析,验证了利用压电阻抗技术进行结构健康检测的有效性,表明RMSD指标对反映结构损伤程度更准确可靠.
文摘在500 k V变电构架的设计中,目前国内人字形构架柱和单钢管悬臂支架柱应用较为成熟,角钢格构式变电构架应用较少。在海外工程中,角钢运输具有较大优势。结合实际工程,以埃塞俄比亚某500 k V变电构架为实例,通过根开的有效组合,对21种不同根开的变电构架进行了全面的计算,以用钢量和混凝土用量为依据进行工程造价比较分析,得出了类似工程条件下的最优根开,以指导工程设计。当构架柱高约为30 m时,结合构架所处地理位置气候等条件,最优根开建议值为6.1 m×3.1 m,即长向根开约取为柱高的1/5,短向根开约取为柱高的1/10时,结构整体力学性能较好且最为经济。
基金supported by the Chinese Academy of Sciences(Grant No.KJCX2-SW-T1)the National Natural Science Foundation of China(Grant No.40174008).
文摘The geocentric coordinates of three mobile sites including Fangshan in Beijing, Urumqi in the Xinjiang Uy-gur Autonomous Region and Lhasa in Tibet are determinedin the ITRF2000 frame by means of both the global SLRdata and the mobile (SLR) data obtained by a mobile satel-lite laser ranging (SLR) apparatus from Aug. 2000 to Dec.2001. The results showed that the geometrical performance of Chinese SLR network has been significantly improved.