| Regression Formulations for the Stress at Hot Spot of Multiplanar Tubular DT Joints |
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| 作者单位： | Chen Tieyun Zhang Huiyuan Professor，Shanghai Jiao Tong University，Shanghai 200030 Doctor of Engineering，Shenzhen Shipbuilding Trading Co. LTD. |
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| 摘 要： | - Stress concentration analysis of multiplanar tubular DT joints plays an important role in the fatigue design of offshore platforms. A semi-analytic method for stress analysis under the condition of any loads is briefly introduced in the paper. Nineteen multiplanar tubular DT joints with one of two braces of the same dimension subjected to axial loads and out- of- plane bending moments are computed for parametric stress analysis by using the present method. The influence of geometrical parameters on the stresses of multiplanar tubular DT joints is discussed and compared with corresponding uniplanar T joints. The regression formulae for the stress at hot spot of multiplanar DT joints are found by modification of SCF of corresponding uniplanar T joints. The parametric formulae for the maximum stress by superposition. Finally, the influences of stiffening effect and load-interaction effect on the maximum stress of DT joints are discussed.
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Regression Formulations for the Stress at Hot Spot of Multiplanar Tubular DT Joints |
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| Chen Tieyun Zhang Huiyuan Professor,Shanghai Jiao Tong University,Shanghai Doctor of Engineering,Shenzhen Shipbuilding Trading Co. LTD.. Regression Formulations for the Stress at Hot Spot of Multiplanar Tubular DT Joints[J]. China Ocean Engineering, 1993, 0(1) |
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| Authors: | Chen Tieyun Zhang Huiyuan Professor Shanghai Jiao Tong University Shanghai Doctor of Engineering Shenzhen Shipbuilding Trading Co. LTD. |
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| Affiliation: | Chen Tieyun Zhang Huiyuan Professor,Shanghai Jiao Tong University,Shanghai 200030 Doctor of Engineering,Shenzhen Shipbuilding Trading Co. LTD. |
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| Abstract: | - Stress concentration analysis of multiplanar tubular DT joints plays an important role in the fatigue design of offshore platforms. A semi-analytic method for stress analysis under the condition of any loads is briefly introduced in the paper. Nineteen multiplanar tubular DT joints with one of two braces of the same dimension subjected to axial loads and out- of- plane bending moments are computed for parametric stress analysis by using the present method. The influence of geometrical parameters on the stresses of multiplanar tubular DT joints is discussed and compared with corresponding uniplanar T joints. The regression formulae for the stress at hot spot of multiplanar DT joints are found by modification of SCF of corresponding uniplanar T joints. The parametric formulae for the maximum stress by superposition. Finally, the influences of stiffening effect and load-interaction effect on the maximum stress of DT joints are discussed. |
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| Keywords: | multiplanar tubular DT joints stress concentration factors parametric stress analysis stiffening effect load-interaction effect |
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