钢筋焊接温度变化规律及对植筋承载力的影响

The Influence of Welding Temperature on the Bearing Capacity of Bars Embedded in a Structural Matrix

为了研究焊接温度对植筋性能的影响,采用测温仪对不同直径的钢筋(Φ12,Φ16和Φ25)在双面焊接情况下的焊接温度进行了量测,得到了距落弧点不同距离、不同时刻的温度变化规律,以及同一时刻各测点的温度变化规律;同时对焊接后植筋的极限承载力进行了试验,分析了焊接位置对植筋承载能力的影响.结果表明:距离落弧点越远,焊接时温度越低,距离大于200mm时,测点温度低于50℃.焊接点到胶层的距离在200 mm以外时,焊接温度对植筋承载力的影响可以忽略不计;焊接点到胶层的距离在200 mm以内时,需采取有效的降温措施.

The thermoscope was used to measure the welding temperature during welding of different diameter bars（Ф12, Ф16 and Ф25） when performing double-faced welding of the bars. This was done to investigate the influence of welding temperature on the capability of the already embedded bars. A relation between temperature at different times, and at different points at the same time, at points various distances from the end of the weld was obtained. The ultimate load bearing capacity of the embedded bars after welding was also tested and the influence of the welding on it was analyzed. The results show that points far from the welding location have lower exterior temperatures.. When the distance is more than 200 mm the temperature is below 50 ℃. The influence of welding temperature on the ultimate bearing capacity of embedded bars can be neglected when the distance from the weld to the structural adhesives exceeds 200 mm. Effective measures must be taken to lower the bar temperature when the distance from the weld to the structural adhesives is less than 200 mm.