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Predicting the maximum load of Reinforced-Concrete Pipe Columns

Tsinghua Science and Technology 2004年第2期9卷 153-159页

作者： Paul Nibasumba 刘西拉 Department of Civil Engineering Tsinghua University Beijing 100084 China Department of Civil Engineering Shanghai Jiao Tong University Shanghai 200030 China

To simplify the calculation of the maximum load at which instability occurs for reinforced-concrete pipe columns under eccentric compression, a method based on the transformed cross-sectional area of the column and the concrete secant modulus of elasticity is proposed, consisting of an iterative process in which a sequence of lateral deflections is at column mid-height. The method assumes the deflected shape of the column as a half cosine wave. Analytical results were compared with experimental values obtained from 16 reinforced-concrete pipe columns. Using deflection at column mid-height recorded during the loading proc-ess, a typical load-deflection curve can be plotted and used to describe column behavior. The experimental results demonstrate that the failure of concrete columns is a process. The starting point is the cracking load point, when cracks are initiated in the concrete of the tensile zone of the critical cross-section of specimens. The maximum load point is the top of the failure process, and then the maximum bending moment occurs. The first point represents instability while the second one corresponds to the strength failure of the columns. The experimental results are close to the analytical values. The method is simple and can be used for stabil-ity analysis of reinforced-concrete pipe columns.

关键词： maximum load reinforced-concrete pipe column

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Impact damage behavior of sandwich composite with aluminum foam core

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 42-46页

作者： Moon Sik HAN Jae Ung CHO Faculty of Mechanical and Automotive Engineering Keimyung University2800 Dalgubeoldaero Dalseo-Gu Daegu 704-701 Korea Division of Mechanical and Automotive Engineering Kongju National University1223-24 Cheonan Daero Seobuk-gu Cheonan-si Chungnam 331-717 Korea

Impact property of the sandwich composite with aluminum foam core was investigated by experiment and simulation analysis. Impact energies of 50, 70 and 100 J were applied to the specimens in impact tests. The results show that the striker penetrates the upper face sheet, causing the core to be damaged at 50 J test but the lower face sheet remains intact with no damage. At 70 J test, the striker penetrates the upper face sheet and the core,and causes the lower face sheet to be damaged. Finally at 100 J test, the striker penetrates both the upper face sheet and the core, and even the lower face sheet. The experimental and simulation results agree with each other. By the confirmation with the experimental results, all these simulation results can be applied on structure study of real sandwich composite with aluminum foam core effectively.

关键词： sandwich composite aluminum foam core impact energy maximum load

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全面推进电力需求侧管理为加快首都建设作贡献

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电力需求侧管理 2002年第Z1期4卷 57-59页

作者：陈铁成金军 Beijing Electric Power Management Office

　　Recently the situation of power supply and demand inBeijing has been experiencing great change with economicdevelopment of the capital, adjustment of industrial struc-ture and improvement of people's living standa... 详细信息

关键词：电力需求侧管理首都 power supply and demand maximum load

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