【摘要】 预应力钢带加固钢筋混凝土梁能有效提高梁斜裂缝开裂荷载和斜截面抗剪承载能力。根据试验研究结果,首先分析预应力钢带加固混凝土梁斜截面破坏机理,并考虑预应力度、钢带应变不均匀系数对梁抗剪承载力的影响,并利用桁架模型推导了预应力钢带加固钢筋混凝土梁的抗剪承载力设计算式和实用计算式,同时进一步对预应力钢带加固钢筋混凝土梁应力状态进行计算分析,提出预应力钢带加固混凝土梁斜截面开裂荷载的计算公式。经与试验结果进行对比分析,所提出斜截面承载能力和开裂荷载的两套算式的计算结果均与试验结果吻合较好。更多还原

【Abstract】 Cracking loads and shear-bearing capacity of reinforced concrete beams retrofitted by prestressed steel strips are more larger than retrofitted ones. Based on the former experimental results,the influences of prestressed degree and steel strip strain uneven coefficient were taken into consideration,and the shear bearing capacity calculation method based on truss model of the inclined section in beams retrofitted by transverse prestressed steel strips were studied. Considering reinforced concrete beams before cracking were mostly at elastic stage,and could be simplified as biaxial stress problem. According to analysis of biaxial stress of beam,the calculation formula of cracking load was founded. Compared with the experimental results,all the calculation methods were in good agreement with the test values.更多还原