预应力撑杆加固钢筋混凝土柱的试验研究

Test and Study of Reinforced Concrete Column Strengthened with Pre-stressed Struts

在钢筋混凝土偏心受压柱承受一定初始荷载下,改变钢筋混凝土柱的初始偏心距和加固撑杆的预应力大小,进行加固撑杆应力试验研究。结果表明,偏心受压柱初始压应变及撑杆预应力对加固效果有明显影响,撑杆预应力越大,撑杆对钢筋混凝土柱的卸载效果越明显,在柱破坏时,撑杆承受的应力越高,越能有效缓解撑杆相对于柱的应力滞后效应;初始压应变越大,越应相应提高撑杆预应力,从而充分发挥撑杆承载能力。

Through changing the initial eccentricity of the column and the magnitude of the pre-stress of the strut, the paper studies the stress of the reinforced concrete column with eccentricity and the strengthening strut. The study shows that the strengthening is greatly influenced by the initial change of load of the eccentrically loaded column and the strut pre-stressing. The greater the pre-stressing, the more obvious the offloading effect of the reinforced concrete column by the strut. When the column fails, the greater the stress borne on the strut, the more effectively releasing the stress loading effect of the column by the strut. When the initial load stress becomes greater, the pre-stressing of the strut will be correspondingly raised. Therefore, the strut will play its full role in bearing the load.