Seismc Retrofitting Metrhods for Reinforced Concrete Structures

(1)A编制了钢筋混凝土套壳法和钢套壳法加固纵向钢筋屈曲区域的分析程序。（2）采用钢套箍加固带竖向施工缝的钢筋混凝土梁时，斜向开裂荷载增大，节点处箍筋所受剪力增大。当垂直于垂直接缝引入预应力时，预计也会产生相同的加固效果。(3)In摘要针对FRP片材加固钢筋混凝土柱的问题，建立了4种FRP片材应变估算模型，并对片材断裂破坏模式进行了极限位移估算。(4)In通过对断裂应变极高的聚乙缩醛纤维片材进行缠绕，可以清楚地看出：片材在正常极限状态下不会断裂;极限变形能力得到改善;剪切承载力也得到提高。建立了板料无破裂破坏模式的极限变形预测模型。（5）将弹性屈曲理论计算的屈曲长度内钢筋的局部屈曲行为空间平均化，并与静力网格模型相结合。对墙式墩的分析表明，该模型能较准确地跟踪峰后性状。(6)In通过对某墙式桥墩抗震加固的实例分析，表明采用膨胀剂锚固中间确定钢筋的方法是十分有效的。（7）对静电法加固后钢筋混凝土构件耐久性的试验结果表明，静电法加固后钢筋混凝土构件的渗透系数略有降低，碳化速率系数甚至有所降低。

(1)A program to analyze the region where retrofitting is needed to prevent buckling of longitudinal reinforcement was coded in concrete jacketing method and steel jacketing method.(2)When RC beams with vertical construction joint is strengthened with steel jacketing, diagonal cracking load is increased and shear force carried by the stirrups at the joint is increased. The same retrofitting effect is expected when prestressing force is introduced perpendicularly to the vertical joint.(3)In retrofitting of RC columns with FRP sheet wrapping method, four models to estimate strain of the wrapped sheet were constructed, and it was made possible to estimate ultimate displacement for the failure mode of sheet breakage.(4)In wrapping of poly-acethal fiber sheet, whose breakage strain is extremely high, the followings were made clear : the sheet does not rupture at a normal ultimate state; ultimate deformability is improved; shear capacity is also increased. A model to predict ultimate deformation was constructed for the failure modes without rupture of the sheet.(5)Local buckling behavior of reinforcement within buckling length calculated using elastic buckling theory was spatially averaged and combined with the static lattice model. Analysis on wall-type piers showed that this model can accurately trace the post-peak behavior.(6)In seismic retrofitting of wall-type piers, it was shown that the method in which intermediate confirming reinforcement is anchored with expanding agent is very effective.(7)The experimental results on durability of RC members repaired with electrostatic method showed that permeability coefficient is little lowered and carbonation rate coefficient is even decreased under