焊接高温对钢筋混凝土结构植筋锚固性能影响的分析

Analysis on Influence of High Welding Temperature on Anchorage Behaviors of Post-embedded Bars in Reinforced Concrete Structures

焊接是结构植筋技术中钢筋连接的主要方式,为研究焊接时高温环境对钢筋混凝土植筋结构的锚固性能影响进行了试验研究。采用植入钢筋的不同锚固长度(7D、10D、15D)、焊接距离(0 mm、100mm2、00 mm)、钢筋直径(Φ12、Φ16、Φ25)三个因素,对植筋钢筋的焊接件进行拉拔试验,分析钢筋在高温焊接温度影响下的植筋粘结锚固性能。结果表明,焊接距离在0 mm～200 mm时,焊接温度对滑移量、极限承载力有不同程度的影响,随着锚固长度的增加,植筋的滑移量逐渐减少。适当增加锚固长度有利于植筋极限承载力的提高并能减小植筋的滑移量,焊接距离植筋胶层不小于200 mm。

The welding is a main technique for the post-embedded bars in structures.Here,considering the archorage depth,welding distance and steel bars diameter,the pulling tests are made for the welded units,and the bond archorage behaviors of the post-embedded bars are analyzed,which are under the influence of high welding temperature.The analysis results show that the welding temperature has the influence on the slippage and ultimate bearing capacity to varying degrees when the welding distance is 0～200 mm,and some construction advices are put forward at last.