论文部分内容阅读
提出采用预应力钢带加固技术对处于“可修”性能水准状态的钢筋混凝土框架进行快速抢救加固,以有效提高历经大震的混凝土框架抵抗余震的能力,并为震后全面加固提供条件.首先对一榀三层单跨1:2比例的钢筋混凝土框架进行低周反复拟静力试验,并加载至试件承载能力下降至极限荷载的85%时停止试验.然后采用预应力钢带加固技术对该框架试件的柱端、梁端和节点核心区进行加固,并重新进行低周反复拟静力,以考察加固后框架试件的抗震性能,通过详细对比加固前试件和加固后试件的承载能力、刚度、延性、层间位移角、耗能能力等性能指标,发现采用预应力钢带加固的震后框架试件基本上能达到震前框架的抗震性能,初步表明,采用预应力钢带加固技术可以实现对震后混凝土框架的有效加固,非常适用于对震后混凝土的快速抢救加固.
It is proposed that the prestressed steel strip reinforcement technique should be used to quickly rescue and reinforce reinforced concrete frames with “repairable” performance level to effectively enhance the ability of concrete frames to withstand aftershocks after heavy earthquake and provide conditions for post-earthquake full reinforcement Firstly, the low-cycle repeated quasi-static test was carried out on the RC frame with one-to-one single-span ratio of 1: 2 and the test was stopped until the load carrying capacity of the RC frame decreased to 85% of the ultimate load.The prestressed strip Reinforcement technique was used to reinforce the column ends, beam ends and core regions of the specimens. The low-cycle repeated quasi-static tests were carried out to investigate the seismic performance of the strengthened frame specimens. The detailed comparison of the specimens and the reinforcement The results show that the specimens with post-earthquake reinforcement strengthened with prestressed steel strip can basically achieve the seismic performance of the pre-earthquake frame, The use of prestressed steel reinforcement technology can achieve effective reinforcement of the post-earthquake concrete frame, which is very suitable for rapid rescue and reinforcement of post-earthquake concrete.