有粘结和无粘结预应力型钢混凝土框架竖向抗震性能研究

Study on Vertical Seismic Behavior of Bonded and Unbonded Steel-Reinforced Concrete Frames

为了研究预应力型钢混凝土(PSRC)结构在竖向地震作用下的抗震性能,完成了在梁中设置有粘结和无粘结预应力筋的两榀预应力型钢混凝土框架在竖向低周反复荷载作用下的试验研究,并采用ABAQUS有限元模型对试验曲线进行数值模拟。试验所得滞回曲线基本继承了型钢混凝土结构滞回曲线饱满的特点,并且有着预应力混凝土结构滞回曲线的捏拢效应。研究结果表明该结构形式具有较高的承载能力,优异的抗裂性能及裂缝闭合能力,以及较好的耗能能力和变形延性。ABAQUS计算所得滞回曲线与试验结果符合程度较好,模拟得到了滞回曲线的捏拢效应以及荷载下降段,说明了计算模型的可靠性,特别是所采用的损伤因子计算方法的可行性。

In order to study the seismic behavior of prestressed steel-reinforced concrete（ PSRC）structure under vertical seismic loading,two prestressed steel-reinforced concrete frames with bonded and unbonded tendons respectively were tested under vertical cyclic loading. In addition,numerical simulation was done to the two tested frames based on ABAQUS finite element models. Experimental hysteretic curve under cyclic load,which also has pinching effect similar to prestressed concrete structure,inherits the fullness characteristic from hysteretic curve of steel-reinforced concrete structure. Study result shows that this form of structure possesses high bearing capacity,excellent crack resistance and crack closure ability,good energy dissipating and deformable ductility. The hysteretic curves from ABAQUS calculation have a good agreement with those from experimental study,in both aspects of pinching effect and post-peak curve,meaning the reliability of the element model,especially the feasibility of adopted method of damage factor calculating.