混凝土中植筋深度的理论与试验研究

Analysis and Test Investigation of Depth Embedded Steel Bars

通过在混凝土中植筋的拉拔试验,研究了不同条件下植筋的破坏形态,分析了混凝土强度、钢筋直径和钢筋的强度等级对植筋深度的影响。给出了粘结破坏、锥形破坏、钢筋屈服和应力传递破坏等四种破坏形态的计算模型和相应的植筋深度计算公式,并通过多组试验证明了计算公式的正确性。研究成果可为加固工程设计中的植筋提供理论指导,也可为有关加固规程的修订提供依据。

Through the pull-out tests of embedded steel bars, the failure forms of embedded steel bars are investigated. The influence of the strength of embedded steel bars, concrete strength and the diameter of steel bar is analyzed for the depth of embedded steel bars. According to the analysis of the test results, four failure forms of the cohesion, conical contour, steel bar yielding and stress transmitting of embedded steel bars are given, and the corresponding formulas are derived. The formula correctness is proved through the pull-out test of embedded steel bars. This results can offer the theoretical guidance for the application and the project design of embedded steel bars and it can supply the basis for the modification of the national code.