L形T形柱节点承载力影响因素分析

L形T形柱节点为非对称结构,且核心区混凝土体积较小,钢筋密集,节点处受力情况复杂,作为异形柱结构最薄弱又非常重要的环节目前对此研究较少。通过对13个L形和T形柱节点进行非线性有限元分析,研究了在单调荷载作用下,节点核心区箍筋、混凝土强度等级、梁柱纵筋配筋率、梁柱配箍率对L形、T形节点破坏荷载的影响。计算表明,同样条件下,L形节点的破坏荷载仅有T形节点的60%左右。节点核心区箍筋成为影响异形柱节点破坏荷载大小的最主要因素,节点核心区箍筋的数量、面积、以及箍筋强度等级的提高都可以提高节点的破坏荷载,而节点箍筋的数量起主导作用。提高混凝土的强度等级,增加梁柱纵筋配筋率,增加梁柱的配箍率在一定程度上都可以提高节点的破坏荷载,但对不同类型节点的影响程度不同。

Carrying capacity reserch on L-shaped and T-shaped joints

L-shaped and T-shaped joint are unsymmetrical,and the concrete in the core region is relatively small but bars crowded.Joint as a weak but important area has a difficult force condition and it is necessary to be analysed in detail.The purpose of this reserch is to study the effects on joints' failure load by stirrups in joint region,concrete strength grade,reinforcements ratio of beams and columns and stirrups of beams and columns.The results show that,under the same situation,the failure load of L-shaped joint is about 60% of the failure load of T-shaped joints,and stirrups in joint region are the main aspect to influence the failure load of joints.Raising the number,area,strength grade of stirrups can promote the failure load of joints,and the number the stirrups plays an essential role among those three aspects.Raising the strength grade of concrete,reinforcement of the ratio of the beams and the columns,stirrups of the beams and columns can also promote the failure load of joints,but these conditions have different effects on different types of joints.