新型预制预应力混凝土框架结构有限元分析

Finite element analysis on the new precast prestressed concrete frame structure

为了研究新型预制预应力混凝土框架结构的抗震性能,本文采用ABAQUS软件对试验节点进行有限元分析,验证了建模方法的正确性,并以试验节点为原型,建立相应的两层两跨的新型预制预应力混凝土平面框架模型。采用低周往复加载方式分析了新型预制预应力混凝土框架结构和现浇框架结构的滞回性能,并模拟了新型预制预应力混凝土框架结构在不同的初始荷载、预应力筋数量及控制应力和U形筋配筋率下的滞回性能。结果表明,新型预制预应力混凝土框架和现浇框架的滞回性能非常接近;框架轴压比、预应力筋数量和U形筋配筋率对新型预制预应力混凝土框架的滞回性能有影响,而梁上荷载和预应力筋控制应力的影响较小。

To study the seismic performance of new precast prestressed concrete frame structure(PPCFS), the software ABAQUS was used to simulate the test joint and verify the validity of the modeling method. Based on the test joint, two-story, two-span plane frame models of the new PPCFS were set up. The hysteretic properties of the new PPCFS and the cast-in-place frame structure(CIPFS) were analyzed by cyclic loading numerical analysis, and the hysteretic performance of the new PPCFS under different initial load, number and initial prestress of prestressed steel bar and reinforcement ratio of U-shaped steel bar were analyzed. The results show that the hysteretic performance the new PPCFS is very close to that of the CIPFS. The axial compression ratio of the frame, the number of prestressed steel bar and the reinforcement ratio of U-shape steel bar affect the performance of the new PPCFS, and the influence of the load on the beam and the initial prestress is small.