中文摘要：

通过三维有限元分析,研究整体现浇预应力混凝土桥墩动力开裂特性。采用双直线钢筋模型和Kent—R.Park混凝土模型,不考虑混凝土和钢筋之间的黏结和滑移,建立分离式有限元模型。对比分析了普通钢筋混凝土墩柱和预应力钢筋混凝土墩柱在地震荷载下的开裂特性。分析结果表明,增加预应力钢束,能够减小墩柱的受拉区域,降低了混凝土的拉应力,推迟了模型裂缝的出现,并且减小墩顶变形。

英文摘要：

Through 3-dimension finite element analyses, overall cast-in-place prestressed concrete pier seismic crack characteristic is researched. The separation formula finite element model is established by means of bilinear reinforce model and Kent-R. Park concretes model, without considering slip between concretes and reinforced bars. The seismic crack characteristics between prestressed concrete pier and reinforcement concretes pier. The results show that the prestressed reinforcement can reduce the tensile zone of concrete, put off the appearance of cracks, improved the stiffness of pier, and reduced the top displacement.