再生混凝土柱抗震性能试验

Experimental research on hysteretic behavior of recycled concrete

摘要:

为了进一步在实际工程中推广应用再生混凝土,进行了8根再生混凝土柱和4根普通混凝土柱的低周反复荷载试验.采用建研式加载方式获得了荷载-位移滞回曲线.试验结果表明:再生混凝土柱的破坏形式、滞回特性、能量耗散、骨架曲线、刚度、承载力与普通混凝土柱相近;在小轴压比时发生延性破坏,在大轴压比时,发生脆性破坏;再生混凝土柱延性比普通混凝土柱差,粉煤灰的掺入可以改善再生混凝土柱的延性,但承载力会降低.总之,再生混凝土柱的抗震性能与普通混凝土相近.

Abstract:

To further promote the use of recycled concrete in practice,Pseudo-static tests were carried out for 4 natural RC’s(reinforced concrete) columns and 8 recycled RC’s columns.During the institute of building type test,the Load(P)-displacement(Δ) relationship curves to each specimen were obtained,and the breakage mode,hysteresis loop,skeleton curves,energy dissipation,stiffness retrogression,ductility performance and carrying capacity of each specimen were similar to those of the natural RC’s columns.In small axial ratio,the bradage mode was brittleness default,and in large axial ratio,the mode was ductility breakage.The ductility performance of recycled concrete is poor to the natural concrete.The fly ash could improve the ductility performance but lower the carrying capacity.In conclusion,the seismic behavior of recycled aggregate RC’s column is apparently similar to that of natural RC’s column.