考虑分阶段受力的桥梁加固受弯构件正截面强度计算方法研究

Calculation Method of Carry Capacity of Cross Section in Bending Member Bridge Consolidation Considering Stage Loading

桥梁结构自重较大,一般均采用带载加固。当在梁的受拉区直接粘贴钢板或粘贴其他纤维复合材料对桥梁进行加固时,一期恒载(构件自重与恒载)由原梁承担,二期荷载(活载)由加固后的组合截面承担,后加补强材料的强度发挥程度受原梁变形的限制,应考虑分阶段受力特点。通过理论分析,分别考虑以原梁混凝土极限压应变和原梁受拉钢筋极限拉应变控制的加固设计方法,得出了直接粘贴钢板或粘贴其他高强纤维复合材料加固桥梁的正截面抗弯承载力的计算公式。

The bridge structure is self-possessed in a big way, uses the in-loading carry the rein- forcement generally; When is pulled when beam the area to glue directly the steel plate or glues other textile fiber compound materials carries on to the bridge the reinforcement, issue of dead load （component is self-possessed with dead load） by original beam undertakes, two issue of loads （live load） undertakes after the reinforcement compound section, add-on makes up the strong material the intensity display degree the limit which distorts original beam, should consider the stage loading characteristic. Through the theoretical analysis, considered separately by the original beam concrete limit pressure strain and the original beam tensile reinforcement limit tensile strain control reinforcement design method, obtained has glued the steel plate directly or glues other excel in textile fiber compound materials reinforcement bridge the carry capacity of cross section formula.