二次受力条件下钢筋混凝土梁填补孔洞后的受力研究

Research on second-loading systems of reinforced concrete beam after filing the openings

通过对二次受力条件下CGM灌浆料填补修复钢筋混凝土开孔梁进行了试验研究,结果表明,初始荷载对在剪弯段开孔梁的受力性能削弱明显。采用CGM灌浆料填补后,开孔梁的承载力提高,挠度增长减慢,破坏形态为弯曲破坏,随着初始荷载的增大,填补梁破坏时孔洞处裂缝变宽,梁的抗剪承载力降低,但当初始荷载在一定范围内时,填补梁的受力性能基本能接近未开孔梁。

Under second-loading systems,the mechanical properties of the beam with opening filled by CGM were studied by experi-mental research.The research shows that the mechanical properties of the beams with opening in the shear-bending section is weakened ob-viously by initial load.After filling the opening,the mechanical properties of the beams is improved,and the failure mode of the beams is bending failure.With the increase of the initial load,the creak width of opening becomes wider when broken,the shear capacity of beams filled by CGM decreases,but while the opening size is within certain premises,the mechanical properties of the beams filled by CGM can basically achieve the state of the beam with no opening.