型钢纤维混凝土框架加固既有结构的试验研究

在既有框架结构外侧附设新的型钢纤维混凝土框架且新旧框架通过新增设的楼板和直交梁进行连接,从而实现对既有框架加固的目的。该方法既可大幅提高结构抗震能力又可减小对原有建筑空间的影响。文章通过对1个钢筋混凝土未加固框架和3个已加固框架的低周反复荷载作用试验,重点研究了加固后框架的滞回曲线、既有框架和加固框架之间的变形关系、新旧框架柱中钢筋和型钢应力分布规律。结果表明:该加固方法不仅可提高既有结构的抗震承载力而且具有良好的稳定性;板的外伸长度以及新设加固框架中柱子的数量和梁截面尺寸是影响加固框架性能发挥的重要影响因素;新旧框架柱中钢筋和型钢应力均可达到屈服强度共同工作效果。

Experimental study on seismic retrofitting method by using fiber concrete encased steel structural frame

A new retrofitting method that fiber concrete encased steel frames are indirectly installed through extended connection slabs and beams to existing RC framers is proposed and the advantage of this method is that the ability of the old building will be significantly increased and the influence to the old building will also be very small. On the base of the quasi-static experiment research of one existed old RC frame specimen and three retrofitted frames, the characteristic of the hysterisis curves, displacement relation between the existed and the new retrofitting frames and the Strain distribution is studied. The results show that the seismic ability is increased and working performance of the retrofitted specimens is stable, the extension length of the slab and the number the columns or the size of the beam section are important influencing factors to the working performance of the new retrofitting frames, steel bars strength will reach its yield strength which means the new retrofitted frame can work well with the old frame structure.