Free vibration characteristics of single-layer spherical aluminium alloy-latticed shells with gusset joints

WANG Li,GUO Xiaonong,ZHU Shaojun, LUO Xiaoqun

Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (21) : 1-7.

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (21) : 1-7.

Free vibration characteristics of single-layer spherical aluminium alloy-latticed shells with gusset joints

  • WANG Li,GUO Xiaonong,ZHU Shaojun, LUO Xiaoqun
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Abstract

In order to study free vibration characteristics of K6 and K8 aluminum alloy single-layer spherical latticed shells with gusset joints, large amounts of finite element (FE) analyses were performed using the software ANSYS considering effects of rise-span ratio, span, roof load, span-thickness ratio, grid density and constraint conditions, etc.parameters.Based on the FE simulation analysis results, the formula to estimate the fundamental natural frequency of single-layer spherical latticed shells not considering effects of joint stiffness was derived.Then, by introducing the amplification factor for the fundamental natural frequency, the formula to estimate the fundamental natural frequency of aluminum alloy shells considering effects of their gusset joints’ stiffness was proposed.Finally, the calculated value obtained with the proposed formula was compared with the measured fundamental natural frequency of a certain actual shell with gusset joints in tests.It was shown that both of them agree well each other, so the effectiveness of the proposed formula is verified.
 

Key words

aluminum alloy / gusset joint / single-layer spherical latticed shell / free vibration characteristic;joint stiffness

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WANG Li,GUO Xiaonong,ZHU Shaojun, LUO Xiaoqun. Free vibration characteristics of single-layer spherical aluminium alloy-latticed shells with gusset joints[J]. Journal of Vibration and Shock, 2018, 37(21): 1-7

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