混合配筋梁式转换结构抗震性能试验研究

Tests for a seismic performance of hybrid reinforced beam transfer structures

通过对3榀混合配筋梁式转换结构和1榀钢筋混凝土梁式转换结构进行拟静力试验,在与钢筋混凝土梁式转换结构对比分析的基础上,研究混合配筋梁式转换结构在竖向和水平荷载作用下的受弯性能、屈服机制、破坏机制,以及承载能力、滞回特征、刚度退化、延性和抗震性能,探讨端部CFRP筋锚固措施。试验结果表明:混合配筋梁式转换结构的承载能力优于全钢筋混凝土梁式转换结构;结构延性系数均大于3,刚度退化曲线没有明显速降,骨架曲线下降平缓,以及滞回曲线较为丰满说明混合配筋梁式转换结构具有较好的延性和抗震性能;该结构满足我国抗震规范对延性框架"强柱、弱梁、强节点"的设计要求。若采取可靠的锚固措施,CFRP筋、钢筋与混凝土完全能够共同可靠工作。

Pseudo static tests were conducted for 3 specimens of hybrid reinforced beam transfer structures and 1 specimen of reinforced concrete beam transfer structures. Compared with those of reinforced concrete beam transfer structures, the behaviors of flexural performance, yielding mechanism, failure mechanism, and bearing capacity, hysteretic behavior, stiffness degradation, ductility and a seismic performance of hybrid reinforced beam transfer structures under vertical load and horizontal loads were studied, the CFRP anchor at the end was explored. The test results showed that bearing capacity of hybrid reinforced beam transfer structures is better than that of reinforced concrete beam transfer structures; their structural ductility coefficients are greater than 3; their stiffness degradation curves have no drops; their skeleton curves decrease slowly; and the hysteresis curve of the former is plump; hybrid reinforced beam transfer structures have better ductility and a seismic performance; these structures meet China aseismic code＇s requirements of ＂strong column, weak beam, strong nodes＂ for design of ductile frames; if the anchorage is safe , CFRP bars, concrete and steel bars can jointly work reliably.