管道三通塑性极限压力及其影响因素分析

基于极限分析的观点，得到了两个适于工程上采用的焊制三通塑性极限压力估算式，并结合试验数据进行了验证和影响因素分析。结果表明，基于相贯性屈服和等面积补强得到的估算公式是可用的，其中相贯线屈服分析得到的公式最精确，具有推广价值，主管厚径比对三通塑性承载能力有加强作用，而管径比对极限压力的影响规律有待进一步研究。

Plastic Limit Pressures for the Branch Pipe Tee Connection and Effective Factors Analysis

Based on the viewpoint of limit analysis,two equations can be used to evaluate the plastic limit pressures of welded branch pipe tee connection are proposed. The effective factors and the validity of these e-quations are discussed by using the experimental data. The results have shown that the equations derived from the yield of cylinder-cylinder intersection and equal area reinforcement are usable in the engineering design,and more accurate results can be obtained with the equation derived from insersection yield. It has a great value to spread this equation. The plastic limit load of tee connection will increase as the ratio of pipe radius and wall increase. However,the influential law of the parameter d/D and limit pressure need to be studied deeply.