中文摘要：

在考虑连接结构承受外弯矩作用和螺栓、法兰及垫片蠕变的基础上，建立高温螺栓法兰连接结构的变形协调分析方程，采用解析方法研究连接结构承受外弯矩和蠕变对连接结构力学行为的影响。结果表明，外弯矩作用下，受拉侧的法兰转角增大，螺栓伸长量减小，垫片应力增大；受压侧的情况则相反。在相同的工作条件下，考虑蠕变时，温度越高，法兰转角、法兰变形量和垫片应力减小幅度越大。外弯矩引起的垫片受拉侧应力下降和元件的蠕变是连接结构密封失效的重要原因。

英文摘要：

Considering the external bending moment and the creep of bolt, flange and gasket, the deformation compatibil- ity equation of the high temperature bolted flanged connections was established. The effect of external bending moment and element creep on mechanical behavior of connections was investigated. The results indicate that flange rotation is decreased and bolt deformation is increased on tension side with the increase of external bending moment, to which the situation is opposite on compression side. Because of the element creep of connections, flange rotation and deformation, gasket stress are decreased and bolt deformation is increased with time. The gasket stress decreasing on tension side caused by external bending moment and element creep is the key parameter that leads to sealing failure of connections.