桥梁加固薄弱受弯构件承载力极限状态计算

Analysis of Ultimate Load-carrying Capacity of Strengthened Weak Bending Member of Bridges

桥梁结构一般采用带载加固,其承载力应按两阶段受力构件计算。首先分析加筋和加混凝土两类受弯构件正截面承载力计算方法和计算公式。另外在试验研究的基础上建立考虑两阶段受力影响的桥梁加固钢筋混凝土受弯构件斜截面承载力计算公式和实用条件,分析两阶段受力对箍筋、弯起钢筋、混凝土和后加补强斜钢板抗剪承载力的影响。最后给出桥梁加固薄弱受弯构件设计实用计算方法。

The ultimate load-carrying capacity of strengthened weak bending member of bridges should be calculated by 2-stage loading method.The analysis method and calculation expressions of load-carrying capacity of cross section of weak bending members strengthened by steel bar or concrete are established firstly.The calculation method and expressions of load-carrying capacity of inclined section of strengthened weak bending member and its application conditions are discussed on the basis of test analyses,and the influences of 2-stage loading to shear load-carrying capacity of stirrup,bend up bar,concrete and steel plates are discussed.The practical design method and calculation expressions of strengthened weak bending member of bridge are given in the end.