The properties of steel material become dependent on the temperature and duration of heating during a fire event. Thermal creep strain is a time-dependent plastic deformation that becomes significant under constant load and high temperatures. The goal of this study is to understand the thermal creep effect on the behavior of a beam-column flush end-plate connection subjected to transient fire conditions. Finite element models were developed and validated against experimental work available in the literature. Parametric studies were conducted to study the overall response of the connection with and without the explicit consideration of thermal creep. The parameters included are heating/cooling rate, beam length, load ratio, plate thickness, bolt size, column axial compressive force, and creep effect in bolts. The thermal creep effect decreases the beam thermal induced compressive forces and simultaneously causes larger mid-span deflections at high heating temperatures. At slow heating rates, the effect of thermal creep can significantly reduce the compressive force at the end of heating while generating high tensile forces at the end of cooling. Neglecting the thermal creep in the analysis may cause inaccurate prediction of the tying forces and rotational demand of the connection.

钢材的性能取决于火灾期间的温度和加热持续时间。热蠕变应变是随时间变化的塑性变形，在恒定负载和高温下会变得很明显。这项研究的目的是了解在瞬态火灾条件下，热蠕变对梁柱齐平端板连接行为的影响。开发了有限元模型，并对照文献中的实验工作进行了验证。在没有明确考虑热蠕变的情况下，进行了参数研究以研究连接的整体响应。包括的参数包括加热/冷却速率，梁长度，负载比，板厚，螺栓尺寸，柱轴向压缩力以及螺栓的蠕变效应。热蠕变效应会降低梁的热感应压缩力，并同时在较高的加热温度下引起较大的中跨挠度。在缓慢的加热速率下，热蠕变的作用可以显着降低加热结束时的压缩力，同时在冷却结束时产生高拉力。在分析中忽略热蠕变可能会导致对连接力和连接旋转需求的不正确预测。