横力弯矩作用下周向裂纹管的塑性极限载荷

Plastic collapse load analysis of circumferentially cracked pipes under side force

目前对承受弯矩的裂纹管道的塑性极限载荷的研究一般都只限于纯弯矩 ,而工程实际中承受弯矩载荷的管道大部分是横力弯矩 ,截面上同时存在正应力和剪应力 ,尤其是管道的跨度较短 ,所受的横向力较大时 ,剪应力对管道的极限承载能力有较大的影响。基于以上考虑 ,建立了含周向裂纹管道在横力弯矩组合载荷作用下的塑性极限分析模型 ,推导了包含埋藏裂纹、内表面裂纹、外表面裂纹和穿透裂纹等不同裂纹形式在拉力、横向力及内压作用下的极限载荷计算公式 。

Shearing strength has great effect on the limit bearing capacity of circumferentially cracked pipes under side force. Therefore a mechanical model of plastic collapse load analysis of the pipe is established. And equations are derived to calculate the collapse load of the pipe with various cracks under tensile force and side force and inner pressure, which can be used for the evaluation of the safety of the circumferentially cracked pipes under various loads.