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根据大型低温LNG储罐的施工技术特点,大型钢筋网片在脉动风荷载等动力荷载作用下易产生大幅振动,极易引起钢筋网片的失稳破坏。采用SAP 2000有限元软件建立了大型LNG低温储罐9-11段钢筋网片的有限元模型,通过模态分析得到了该钢筋网片的自振特性;考虑P-Δ效应,对该LNG储罐钢筋网片进行了风荷载作用下的抗风分析;并采用工字型钢加固处理技术对该钢筋网片进行了加固分析与设计。结果表明:在适当的位置布置工字型钢,能明显减小钢筋网片的风振响应,提高钢筋网片施工的稳定性和安全性。
According to the construction technology of large cryogenic LNG storage tanks, large steel mesh plates tend to vibrate sharply under dynamic loads such as fluctuating wind loads, which can easily lead to the instability of the steel mesh. The finite element model of 9-11 segment reinforced mesh of large LNG cryogenic storage tank was established by finite element software SAP 2000. The natural vibration characteristics of the reinforced mesh were obtained by modal analysis. Considering P-Δ effect, The canned steel mesh was subjected to the wind resistance analysis under wind load. The steel mesh reinforcement was analyzed and designed by using the H-shaped steel reinforcement technology. The results show that the arrangement of H-section steel in proper position can obviously reduce the wind-induced vibration response of steel mesh and improve the stability and safety of steel mesh construction.