轻质高强微膨胀混凝土在旧桥加固中的应用

介绍了轻质高强微膨胀混凝土在桥梁加固改造中的试验情况。探讨和推导了膨胀变形作用下组合截面在超静定结构中引起自应力和次应力计算理论及公式 ,编制了相应程序 ,对测控点应变、应力理论值进行了计算 ,与实测值进行了比较。加固效果表明 :轻质高强微膨胀混凝土用于桥梁主要受力构件的加固中可行 ,并具有一定优越性。

Application of Light Weight, High Strength and Slight Expansion Concrete in Consolidation of Old Bridge

The paper introduces the testing condition of light weight, high strength and slight expansion concrete in consolidation and reformation of bridges. It also approaches and deduces the calculation theory and formula of self-stress and secondary stress of composite section in statically indeterminable structure under expansion deformation role. It compiles the corresponding progress to calculate the strain and stress theory value of measuring control points as well as compare the actually measured value. The effect of the consolidation shows that light weight, high strength and slight expansion concrete can be used in the consolidation of the main forced members of bridges and has a certain superiority.