钢筋混凝土桥墩弯剪扭抗震加固设计探讨

发布时间：2018-03-26 11:13

本文选题：公路桥梁　切入点：弯、剪、扭抗震加固　出处：《铁道建筑》2017年11期

【摘要】：针对曲线桥梁钢筋混凝土(Reinforced Concrete,RC)桥墩,在已有抗震加固措施的基础上,提出一种考虑弯、剪、扭耦合作用的桥墩新型抗震加固措施:采用分段凹凸钢纤维混凝土预制壳壁沿桥墩全高进行加固,并在壳壁内部设置无粘结钢筋。阐述了该加固措施的加固机理,并提出了弯、剪、扭抗震加固设计方法,同时基于平截面假定理论推导了加固后桥墩的抗弯承载力和抗扭承载力计算公式。通过实际算例表明,在扭矩由凹凸钢纤维混凝土预制壳壁承担并保证抗扭承载力不致降低的前提下,加固后桥墩的屈服弯矩、极限弯矩较加固前提高近一倍,达到了设计目标,且本文建议的公式计算值与XTRACT计算值十分接近,验证了公式的正确性和有效性。
[Abstract]:In view of reinforced concrete reinforced concrete reinforced concrete reinforced concrete reinforced concrete (RC) pier of curved bridge, on the basis of existing seismic reinforcement measures, a new method considering bending and shear is proposed. The new anti-seismic reinforcement measures of bridge piers subjected to torsional coupling are as follows: the precast steel fiber reinforced concrete shell wall is strengthened along the full height of the pier, and the unbonded reinforcing bar is installed inside the shell wall. The reinforcement mechanism of the reinforcement measure is expounded, and the bending is put forward. Based on the theory of plane section assumption, the calculation formulas of flexural and torsional bearing capacity of reinforced pier are derived. Under the premise that the torque is borne by the precast shell wall of steel fiber reinforced concrete (SFRC) and the torsional bearing capacity is not reduced, the yield moment and ultimate bending moment of the reinforced pier are nearly twice as high as those before the reinforcement, and the design goal is achieved. The calculated values of the formula proposed in this paper are very close to those of XTRACT, which verifies the correctness and validity of the formula.
【作者单位】：西南科技大学土木工程与建筑学院;
【基金】：西南科技大学研究生创新基金(16ycx074)
【分类号】：U442.55;U443.22

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