混凝土箱梁预应力齿块锚固区承载力拉压杆模型研究

Research on strut-and-tie bar model for predicting bearing capacity of prestressed tooth block anchorage zone in concrete girder

根据主应力迹线指示的应力传递路径,构建出齿块锚固区的拉压杆模型,详细阐述了模型中关键节点及关键杆件所在位置,在此基础上提出基于拉压杆模型的齿块锚下局部受压承载力计算方法.与试验结果对比,本方法精度较高,可实现对齿块锚固区局部受压承载能力的合理预测.

From the stress path instructing by the principal stress tracing line,a strut-and-tie bar model near tooth block anchorage zone is constructed,in which a location of the key nodes and rods are discussed in detail.Based on the model,a calculation method of bearing capacity under local compression is proposed.The method has higher accuracy;through results on the spot to predict reasonablely local bearing capacity near the tooth block anchorage zone.