組合せ荷重を受けるパイプの最終強度 : その3 : 曲げ,外圧および軸力を受ける海底パイプラインの座屈強度の検討

概要

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An inelastic bifurcation analysis method is proposed to investigate collapse behavior of submarine pipelines under the combined loads. Computer program "PCOLAS" is developed by combining this method with simplified analytical method developed in the first report where limit load types of collapse were considered. Four-point bending tests are carried out on aluminium alloy and stainless steel pipes. Theoretical results are evaluated from the test results and also from available test results for combined bending and external pressure ; the theoretical values agree with test results. Main results are : -PCOLAS enable us to investigate the complicated collapse behavior of submarine pipeline subjected to combined loads in a few CPU-seconds (HITAC M-280 H). -For pure bending load, and combined bending and external pressure, bifurcation occures before limit load type of collapse occures. -Axial tensile force increases the bifurcation curvature ; however, this axial force decreases the moment carrying capacities.
社団法人日本船舶海洋工学会の論文