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Performance of circular bimetallic tube confined concrete slender columns under eccentric compression

Gao Shan, Guo Lanhui

Archives of Civil and Mechanical Engineering

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2021

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Vol. 21, no. 2

13--39

EN

This paper aims to investigate the performance of thin-walled circular stainless steel-carbon steel bimetallic tube confined concrete slender columns under eccentric compression. 14 slender columns including bimetallic tube confined concrete (BTCC) with and without rebar, and concrete-filled bimetallic tube (CFBT) were tested. A parametric analysis is conducted based on the validated finite-element model. The results show that the two steel tube layers worked well together and the thin-walled BTCC specimens behaved in a ductile manner. Under the same parameters, the decrease of the diameter–thickness ratio of bimetallic tube improves the bearing capacity and rigidity of the BTCC slender column, but reduces its ductility in the descending stage. The confinement effect of bimetallic tube on the concrete in BTCC columns is stronger than that in CFBT columns. When the yield strength of stainless steel and carbon steel is similar, the stainless steel–total steel ratio has little effect on the capacity of the column. Provided meeting the requirements of corrosion resistance, relatively thinner stainless steel tube is preferred to reduce the cost. The comparison between the simulation and the calculation results shows that the current design method can predict the bearing capacity of the BTCC slender column with large diameter–thickness ratio.

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Projektowanie smukłych słupów żelbetowych według Eurokodu 2

Knauff M., Klempka K.

Inżynieria i Budownictwo

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2009

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R. 65, nr 12

663-665

PL

Rozpatrzono zastosowanie zasad Eurokodu 2 do projektowania budynków jednokondygnacyjnych (hal), w których występują słupy o znacznej smukłości. Stwierdzono, że do projektowania słupów o smukłości większej niż dopuszczona w polskiej normie PN-B-03264:2002 należy stosować teorię II rzędu oraz inne wymagania i ograniczenia przedstawione w artykule.

EN

A one-storey building is analyzed using non-linear analysis (geometric non-linearity) and moment magnification based on nominal stiffness according to Eurocode 2. The results are similar but some discrepancies may be considered as substantial. The design of one-storey buildings, where the columns have a slenderness of more than 100 (maximum slenderness according the Polish Code equals 104), is examined. For very slender columns, the design should be based on second order analysis. Some other restrictions should also be applied.

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Obliczanie smukłych słupów o przekroju kołowym według polskiej normy i metodą uściśloną

Klempka K.

Inżynieria i Budownictwo

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2008

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R. 64, nr 6

329-332

PL

Opisano uściśloną metodę uwzględniania wpływu efektów drugiego rzędu w obliczeniach smukłych słupów żelbetowych o przekroju kołowym. Wyniki obliczeń uzyskanych tą metodą porównano z wynikami wg normy polskiej. Stwierdzono, że zwiększenie mimośrodów obliczonych metodą uściśloną nie jest większe niż uzyskane wg tej normy.

EN

This article describes the improved method of numerical calculation of second order effects of slender RC columns of circular cross-section. The results of the calculations obtained using the improved method were compared with the results calculated according to Polish code. Second order effects according to the improved method are not greater than the ones calculated according to Polish code.

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Piezoelectric Stabilisation of Leipholz Columns

Kurnik W.

Machine Dynamics Problems

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2000

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Vol. 24, No. 1

121-129

EN

The paper is concerned with a concept of flutter suppression in slender columns subjected to tangential follower forces. The mechanism of self-excitation of such systems is more or less recognised what enables a designer to apply proper stabilisation methods including active techniques. Promissing results have been obtained in numerical experiments with distributed piezoelectric actuators contracting column curvature occurring as a disturbance of the strait-line equilibrium position. Piezoelements can also be used in what is called shunting effect to additionally dissipate energy of transverse vibration. The method has been successfully applied in reduction of resonat vibrations of transversely loaded beams and plates. In the present paper the shunting effect is modelled and examined from the point of view of application in a non-conservative self-excited system being the Leipholz column.