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为了研究钢板-混凝土组合加固技术在桥梁加固工程中的应用,提出了钢板-混凝土组合加固预应力混凝土箱梁的抗弯极限承载力计算公式,采用ANSYS软件选用合理单元类型和材料本构关系,对采用钢板-混凝土组合加固的某火灾受损预应力混凝土箱梁桥进行了非线性有限元数值模拟分析对比,并做了加固后效果验证性荷载试验,还对组合加固和粘钢加固效果进行了对比。结果表明:简化公式计算结果与数值分析结果偏差在5%以内;加固后结构关键截面抗弯极限承载力提高30%以上,应变校验系数降低为0.57～0.70,挠度值减小明显,结构基频提高了19%,横向分布系数理论值与实测值比值为0.93～1.05,吻合良好;组合加固梁体校验系数降低为0.66～0.82,较合理且相对均匀,结构受力协同性较好,更有利于提高结构整体受力性能。
In order to study the application of the steel-concrete composite reinforcement technology in the bridge reinforcement project, the formula for calculating the ultimate bearing capacity of the prestressed concrete box girder with steel-concrete composite reinforcement is proposed. The reasonable element type and the material constitutive relationship are selected by ANSYS software, The nonlinear finite element numerical simulation analysis and comparison of a fire damaged prestressed concrete box girder bridge reinforced with steel-concrete composite reinforcement are carried out, and the confirmatory effect test of reinforcement effect is made. The effect of combined reinforcement and steel adhesion reinforcement is also studied Contrast. The results show that the deviation between the calculated results and the numerical results is less than 5%. The ultimate bearing capacity of the critical sections increases by more than 30% and the strain coefficient decreases to 0.57 ~ 0.70, and the deflection decreases obviously. The structural basis Frequency increased by 19%, the ratio of theoretical value of lateral distribution coefficient to measured value was 0.93 ~ 1.05, which was in good agreement. The calibration coefficient of combined reinforcement beam decreased to 0.66 ~ 0.82, which was more reasonable and relatively uniform. Help to improve the overall performance of the structure.