梁柱配筋对混凝土局部受压承载力影响研究

Influence of reinforcement in columns and beams on local compression bearing capacity of concrete

针对现行规范计算混凝土局部受压承载力时,未考虑预应力框架节点处箍筋和梁柱纵筋影响的问题,本文在计算混凝土局部受压承载力时,引入了预应力框架节点处梁柱配筋的影响,提出了框架节点处与锚垫板相交的箍筋和梁柱纵筋作为等效垫板的思想.研究结果表明:柱纵筋、梁纵筋和节点箍筋的等效新增的局部受压面积可取为3倍钢筋直径长度在垂直于预应力筋方向的投影面积.基于分析结果,给出了考虑梁柱配筋影响的局部受压面积和底面积的计算公式,提出了考虑梁柱纵筋和箍筋影响的混凝土局部受压承载力计算方法.

To perfect the calculation formula of concrete local compression bearing capacity for the current code, which has no considering the influence of longitudinal-steel in beam, longitudinal-steel in column and stirrup, the positive influence of steel in beams and columns in the local compression bearing capacity calcula- tion, and the thought that reinforcement intersected with anchor plate in beams and columns can be regarded as equivalent plate are put forward. The analysis result shows that the equivalent new added local compression area of reinforcement in beams and columns in node can be taken as the projected area of 3 times of the diame- ter of steel bars in the direction of prestressed bars. Based on the analysis, the calculation formula of local compression area and calculated bottom area, and the calculation method of local compression bearing capacity considering the effect of longitudinal-steel in beam, longitudinal-steel in column and stirrup are put forward.