Influencing factors analyses and matching design of ultimate bearing capacity of external pressure tank

Table 1. Calculation results of different thicknesses of pressure tank shell
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Table 1. Calculation results of different thicknesses of pressure tank shell
液舱壳板厚度相对量（t₁/t^*）第1阶失稳特征值/MPa 极限承载压力/MPa 质量变化/t
1.0 16.436 9.365 0
0.9 13.337 9.068 −3.049
0.8 10.476 8.567 −6.098
0.7 9.096 7.823 −7.775

Table 2. Calculation results of different thicknesses of pressure tank's solid floor
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Table 2. Calculation results of different thicknesses of pressure tank's solid floor
实肋板厚度相对量（t₂/t^*）第1阶失稳特征值/MPa 极限承载压力/MPa 质量变化/t
0.9 16.436 9.365 0
0.8 15.075 8.034 −1.862
0.7 10.315 7.565 −2.886
0.6 7.519 5.957 −4.748

Table 3. Calculation results of different transverse bulkhead thicknesses
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Table 3. Calculation results of different transverse bulkhead thicknesses
横舱壁板厚度相对量（d_t /t^*）第1阶失稳特征值/MPa 极限承载压力/MPa 质量变化/t
1.0 16.436 9.365 0
0.9 16.429 9.362 −0.524
0.8 16.403 9.356 −1.048
0.7 16.377 9.349 −1.337

Table 4. The characteristic stresses of the structure after scheme adjustment

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Table 4. The characteristic stresses of the structure after scheme adjustment

特征部位	特征应力	规范值/MPa	许用值/MPa	强度储备裕度/%
耐压液舱	实肋板跨中纵骨根部壳板内表面周向应力	736.41	977.5	24.7
	板格中心外表面周向应力	635.78	850	25.2
	纵骨自由翼缘上的总应力	394.14	590	33.2
	纵骨跨端腹板剪应力	244.71	354	30.9
耐压船体	相邻肋骨跨中处壳板中面周向应力	582.94	765	23.8
	肋骨跨端处壳板内表面纵向应力	738.42	977.5	24.5
	肋骨应力	348.36	510	31.7

Table 5. Calculation results of different pressure hull thicknesses

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Table 5. Calculation results of different pressure hull thicknesses

耐压船体壳板厚相对量（t/t^*）	第1阶失稳特征值/MPa	耐压船体极限承载压力/MPa	耐压液舱极限承载压力/MPa	质量变化/t
1.825	11.882	6.836	8.920	0
1.9	12.869	7.144	8.920	1.775
2.0	14.238	7.686	8.969	4.141
2.1	15.645	8.204	9.028	6.506
2.2	16.544	8.757	9.104	8.872
2.3	16.545	9.262	9.054	11.238
2.4	16.545	9.998	8.997	13.604

Table 6. The characteristic stresses of the structure at the same ultimate bearing capacity

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Table 6. The characteristic stresses of the structure at the same ultimate bearing capacity

特征部位	特征应力	规范值/MPa	许用值/MPa	强度储备裕度/%
耐压液舱	实肋板跨中纵骨根部壳板内表面周向应力	736.41	977.5	24.7
	板格中心外表面周向应力	635.78	850	25.2
	纵骨自由翼缘上的总应力	394.14	590	33.2
	纵骨跨端腹板剪应力	244.71	354	30.9
耐压船体	相邻肋骨跨中处壳板中面周向应力	481.01	765	37.1
	肋骨跨端处壳板内表面纵向应力	510.57	977.5	47.8
	肋骨应力	308.19	510	39.6

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Dewen TANG, Jun LIU, Yuansheng CHENG. Influencing factors analyses and matching design of ultimate bearing capacity of external pressure tank[J]. Chinese Journal of Ship Research, 2023, 18(4): 251

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