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对8根组合柱进行试验,研究玻璃纤维增强材料(GFRP)管劲性钢筋混凝土组合柱的轴心受压性能。研究结果表明:荷载作用初期,GFRP管、混凝土及型钢单独受力,当荷载达到极限荷载60%左右时,GFRP管的纤维表面出现白纹,当荷载达到极限荷载的70%左右时,GFRP管对混凝土的套箍作用明显增加,当荷载达到极限荷载80%左右时,GFRP管出现频繁的响声,试件的破坏开始于GFRP管破裂、钢材屈服、混凝土压碎。编制组合柱的非线性分析程序,模拟计算结果与试验结果吻合良好。组合柱的承载力随着GFRP管壁厚度的增加、混凝土强度等级的提高及含钢率的增加而提高。
Eight composite columns were tested to study the axial compressive properties of GFRP pipe stiffened composite columns. The results show that when the load reaches 60% of the ultimate load, the GFRP pipe will appear white fringe on the fiber surface. When the load reaches about 70% of the ultimate load, the GFRP pipe, The effect of hoop on concrete increases obviously. When the load reaches about 80% of the ultimate load, the GFRP pipe frequently sounds. The failure of the test piece starts from the rupture of the GFRP pipe, the yielding of steel, and the crushing of concrete. Compile the non-linear analysis program of the composite column, the simulation results are in good agreement with the experimental results. The bearing capacity of composite columns increases with the increase of GFRP wall thickness, the increase of concrete strength grade and the increase of steel content.