配500MPa钢筋后张有黏结预应力混凝土梁抗震性能试验研究

Experimental study on seismic performance of post-tensioned prestressed concrete beams reinforced with 500MPa rebars

500MPa钢筋是我国现阶段大力推广的受力钢筋,其构件的抗震性能研究尤为重要。通过9根后张有黏结预应力混凝土梁及1根普通钢筋混凝土梁的低周反复加载试验,对配置500MPa钢筋后张有黏结预应力梁的抗震性能进行分析,包括梁的滞回性能、骨架曲线、位移延性、刚度退化、耗能性能等。研究了换算配筋率、有效预应力、预应力筋合力点到构件边缘距离、预应力强度比、受压钢筋配筋量等参数对其抗震性能的影响。在此基础上,评估《混凝土结构设计规范》(GB 50010—2010)中有关预应力混凝土结构抗震设计相关规定的合理性。

The use of 500MPa rebar is highly recommended in our current practice, and the study on seismic performance of RC components reinforced with 500MPa rebars is of vital importance. Based on low-cycle reversed loading tests on 9 post-tensioned prestressed concrete beams and 1 RC beam, the seismic performance of 500MPa-rebar reinforced beams, including the hysteretic curve, skeleton curve, displacement ductility, stiffness degradation and energy-dissipation capacity, was systematically investigated. A comprehensive analysis was carried out to study the influences of the converted steel ratio, the effective prestress, the distance from resultant force point of prestresed rebars to the edge of beams, the prestress strength ratio, the quantity of compression reinforcement on the seismic performance. Furthermore, the rationality of relevant provisions on seismic design of prestressed concrete structures in Code for design of concrete structures GB 50010--2010 was discussed and evaluated.