摘要:
考虑不同的的孔洞大小,对剪弯段开孔混凝土梁及采用水泥基灌浆材料(CGM)填补孔洞与碳纤维布加固孔边两种情况下的开孔梁进行了试验研究。研究结果表明:梁开孔致使其挠度增长加快,裂缝宽度增大,承载力显著降低,破坏形态变为脆性的剪切破坏,严重影响梁的安全性,且孔洞越大,破坏越严重;当孔洞尺寸在一定范围内时(d00.4h),采用CGM灌浆料填补孔洞及采用碳纤维布加固孔边,均可有效提高开孔梁的承载力,减缓跨中挠度的增长速度,并使底部钢筋达到屈服,梁的破坏形态恢复至弯曲破坏,其各项力学性能都可恢复至未开孔梁的状态,从而可保证开孔梁的安全性。但采用碳纤维布加固后,随着孔洞的增大,破坏时孔洞处裂缝宽度增大。
Abstract:
Considering the different size of opening， the mechanical properties of the RC beams with opening on the shear bending section， as well as the beams with opening filled with CGM and reinforced by CFRP were researched． The results showed that the growth of deflection of the beam with an opening was increased and its cracks were widened， at the same time its bearing capacity was decreased considerably． The opening made the failure mode of beam become the shear failure，which influenced the safety of beam seriously． The bigger the opening， the more seriously the damage． When the opening in a certain range( d00. 4h) ， the bearing capacity of the beams filled with CGM and reinforced by CFRP was improved effectively，and the growth of deflection at midspan of the beams was slowed down． After filling with CGM and reinforcing by CFRP， the bottom reinforcement of beams could yield， and the failure mode became the bending failure，and whose mechanical properties could be restored to the state of uncracked beams． But with the increase of opening size， the cracks of the beam reinforced with CFRP were widened． The result would provide references for the reinforcement of the RC beams with openings at the shear bending section．
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