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The effect of the cone spacing of a conieal structure on the ice force is studied by model experiments. The ice force reduction coefficient presented in this paper expresses the relationship between the ice force and the arrangement of cones. The experiments prove that the mode of the ice failure before the boundary of upward-downward bending cone (UDBC) is crushing. A conclusion can also be drawn from the experiments that the ice force on the boundary of UDBC is by far less than that on a vertical pile with the same diameter. Moreover, the ice force frequencies on upright and inve-rted cones are obtained under the field condition of the platform JZ20-2, respectively. The results show that the alterna-tion of the ice force on UDBC can hardly induce resonance of platform JZ20-2. 相似文献
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To study ice-induced vibration of a compliant conical structure,a series of model tests were performed from 2004 to 2005.In the tests,the ice sheet before the compliant conical structure was found to fail in two-time breaking.From 2005 to 2006,this type of ice failure was studied through more groups of tests.The tests show that two-time breaking is the typical failure of ice before steep conical structures,and is controlled by other factors at the same time,such as ice speed and the angle of the cone. 相似文献
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For the study on the ice-induced vibration of a compliant mono-cone structure,a series of model tests were performed from 2004 to 2006.In these tests,the ice sheet before the compliant conical structure was found to be failed in two-time breaking.Based on this important finding,model tests study of the ice force on a compliant multi-cone structure were performed from 2006 to 2007.in these tests,the ice sheet broke before each single cone non-simultaneously.The exciting energy of the total ice force was found to be in a wide range of frequencies,and the structure can be easily excited with nonlinear resonance. 相似文献
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论基桩完整性检测技术 总被引：11，自引：4，他引：7
阐述桩的分类,产生缺陷的多重因素及完整性检测的必要性。论述一维杆件中反射波理论依据。激振及接收传感器是检测技术的关键;说明了反射波信号的频率解释和瞬态机械阻抗法的一致性并均以工程实例加以佐证。文中还论述了声波透射法检测基桩完整性的理论及依据,检测的判据,还给出了检测实例。介绍最新声CT技术及检测成果。 相似文献
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The shielding effect of the front pile-row on the ice force acting on the hack pile-row is studied by ice force model tests. In the tests, the front pile-row is designed to model jacket legs and the hack pile-row to model the water resisting pipe-phalanx within the jacket. The shielding factor for ice force corresponding to different conditions are given in this paper. The research indicates that there are many factors, including the longitudinal and lateral spacing between the front and hack pile-row, ice attacking angle and the ratio of pile diameter to ice thickness, that influence the shielding effect on ice force. 相似文献
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1.Introduction Inthedesignofoceanengineeringstructuresforcoldregioncountries,iceloadsarealwaysthe controlloads,andthedesignofice resistingstructuresisoneoftheimportantdesignaspects.Fornat uralseaice,theflexuralstrengthisalwaysonethirdofthecompressivestrength.Soconicalstructures thatcouldinducethebendingfailureoficesheetsarewidelyusedinthedesignsofice resistingstruc tures.Forexample,theplatformKullukintheBeaufortSeaisaninvertedconicalstructure,andan upward downwardbendingconeisusedonplatformJ… 相似文献
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