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以碟形网箱浮环上的法兰所承受的剪应力来衡量浮环的安全性能。指出了法兰最危险的受剪情况,通过对网箱的力学分析和计算,分别得出单张纲和双张纲连接系统中法兰所受剪应力的理论计算公式。对目前应用的12边形碟形网箱进行了计算,得出法兰两端面所受剪应力在单张纲连接系统中同为5.74×107N/m2,在双张纲连接系统中(γ=45°)则分别为4.82×107N/m2和7.50×106N/m2,相比单张纲连接系统减小了16%和87%,从而说明了双张纲连接方式的优点。讨论结果表明,在双张纲连接系统中,12边形碟形网箱的γ应在0°-60°间选择为宜,且当γ=26°时,浮环的安全性能达到最佳。建议将常用的单张纲连接系统改进为双张纲式,以提高网箱的抗风浪性能。
The safety of the floating ring is measured by the shear stress on the flange on the floating ring of the dish cage. The most dangerous shear situation of the flange is pointed out. Through the mechanical analysis and calculation of the cage, the theoretical formulas of the shear stress of the flange in the single-leaf and the double-leaf system are respectively obtained. The current application of 12-sided cages has been calculated. The results show that the shear stress on both ends of the flange is 5.74 × 107N / m2 in the single connecting system and in the double connecting system (γ = 45 °) were 4.82 × 107N / m2 and 7.50 × 106N / m2 respectively, which were reduced by 16% and 87% compared with the single-gang connection system, which illustrated the advantages of double-gang connection. The results of the discussion show that γ should be selected from 0 ° to 60 ° in the double-gantry cage, and the safety of the floating ring should be optimized when γ = 26 °. It is suggested that the common leaflet connecting system should be improved into a double-leaf type to improve the anti-wind-wave performance of the cage.