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复杂岩溶地层考虑压曲效应的桩基竖向承载力研究 被引量:1
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作者 曹化锦 《工程建设与设计》 2023年第9期39-43,共5页
以杭州轨道交通16号线上泉车辆基地桩基为工程背景,采用数值模拟和静载试验相结合的方法,对覆盖性岩溶地层下的桩基竖向承载力进行研究。采用ANSYS建立桩、土、溶洞耦合的三维有限元模型,对岩溶地层下的钻孔灌注桩的基桩承载力进行了数... 以杭州轨道交通16号线上泉车辆基地桩基为工程背景,采用数值模拟和静载试验相结合的方法,对覆盖性岩溶地层下的桩基竖向承载力进行研究。采用ANSYS建立桩、土、溶洞耦合的三维有限元模型,对岩溶地层下的钻孔灌注桩的基桩承载力进行了数值分析,得出桩身范围内溶洞的存在降低了土体对桩身的约束而产生了压曲效应,降低了桩身实际抗压承载力,并且溶洞越大压曲效应越明显,桩基竖向承载力的消弱越多。同时,结合桩基静载试验对数值分析的结果进行验证,保证了结果的有效性。 展开更多
关键词 岩溶地层 压曲效应 桩基竖向承载力 静载试验
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Effects of bending on heat transfer performance of axial micro-grooved heat pipe 被引量:5
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作者 蒋乐伦 汤勇 潘敏强 《Journal of Central South University》 SCIE EI CAS 2011年第2期580-586,共7页
Heat pipe is always bent in the typical application of electronic heat dissipation at high heat flux,which greatly affects its heat transfer performance. The capillary limit of heat transport in the bent micro-grooved... Heat pipe is always bent in the typical application of electronic heat dissipation at high heat flux,which greatly affects its heat transfer performance. The capillary limit of heat transport in the bent micro-grooved heat pipes was analyzed in the vapor pressure drop,the liquid pressure drop and the interaction of the vapor with wick fluid. The bent heat pipes were fabricated and tested from the bending angle,the bending position and the bending radius. The results show that temperature difference and thermal resistance increase while the heat transfer capacity of the heat pipe decreases,with the increase of the bending angles and the bending position closer to the vapor section. However,the effects of bending radius can be ignored. The result agrees well with the predicted equations. 展开更多
关键词 electronics cooling system axial micro-grooved heat pipe BENDING heat transfer performance
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Static Pull-In Analysis of a Composite Laminated Nano-beam with Flexoelectric Effect
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作者 WANG Yiming WANG Ke ZHENG Shijie 《Transactions of Nanjing University of Aeronautics and Astronautics》 EI CSCD 2021年第S01期84-92,共9页
Based on the new modified couple stress theory and considering the flexoelectric effect of the piezoelectric layers,the Euler Bernoulli nano-beam model of composite laminated materials driven by electrostatically fixe... Based on the new modified couple stress theory and considering the flexoelectric effect of the piezoelectric layers,the Euler Bernoulli nano-beam model of composite laminated materials driven by electrostatically fixed supports at both ends is established. The nonlinear differential governing equations and boundary conditions are derived by the Hamilton principle. The generalized differential quadrature method(GDQM) and the Newton Raphson method are used to numerically solve the differential governing equations. The influence of flexoelectric effect on the static and the dynamic pull-in characteristics of laminated nano-beams is analyzed. The results of the numerical calculation are in a good agreement with those in the literature when the model degenerated into a nanobeam model without flexoelectric effect. The stacking sequence,length scale parameter l and piezoelectric layer applied voltage V_(p) of the composite will affect the pull-in voltage,frequency and time-domain response of the structure. Given that the flexoelectric effect will reduce the pull-in voltage and dimensionless natural frequency of the structure,the maximum dimensionless displacement at the midpoint of the beam and the period of time-domain response should be increased. 展开更多
关键词 flexoelectric effect piezoelectric effect PULL-IN generalized differential quadrature method(GDQM)
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