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为了探讨天然气管道带气开孔特殊开孔补强结构受压后的应力情况,利用有限元分析软件对天然气管道带气开孔5种模型进行了有限元建模及应力场分析.5种模型分别为整补、方补、仅焊支管、先焊支管再焊圆形补强圈和先焊支管再焊方形补强片.分析结果显示:整补和方补最大应力位于接管与补强片连接拐角处,其他3种模型最大应力位于主管开孔边缘下表面拐角处;在支管直径与主管直径之比为2/3,管内压力为0.6 MPa时,5种模型的最大应力分别为53.324 MPa、52.878 MPa、59.006 MPa、48.662 MPa和34.806MPa.对于20号钢和Q235材料,补强结构受压后符合强度要求.整补和方补最大应力相差不足1MPa,整补模型的下半瓦片对开孔接管处的补强效果不明显,一般情况下采用方补即可;而先焊支管再焊补强件较整补和方补,最大应力下降较多,补强效果较好;先焊支管再焊方形补强片的补强效果最好,建议在带气开孔中采用此方式.
In order to investigate the stress state of the special open-hole reinforced structure with natural gas pipe opening under pressure, the finite element modeling and stress field analysis of the five kinds of open-hole gas-filled natural gas pipelines were carried out by finite element analysis software.The five models were Rectifier, square fill, only the welding branch pipe, first welding branch pipe and then round reinforcing ring and welded pipe first re-welded square reinforcement.The analysis results show that: , The maximum stress of the other three models is located at the corner of the lower surface of the edge of the opening of the main pipe. The maximum stress of the five models is 53.324 MPa and 52.878 respectively when the ratio of branch pipe diameter to main pipe diameter is 2/3 and pipe pressure is 0.6 MPa MPa, 59.006 MPa, 48.662 MPa and 34.806 MPa. For 20 steel and Q235 material, the reinforced structure complies with the strength requirements after compression, and the difference between the maximum stress of the whole fill and the square fill is less than 1 MPa. Hole take over the reinforcement effect is not obvious, under normal circumstances can be used to complement; and first welded pipe refinish reinforcements than the whole complement and party fill, the maximum stress drop more, better reinforcing effect; first welding branch pipe Re-welding square reinforcement of the reinforcing effect Good recommended in this manner with the gas openings.