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首先针对服役35年的钢筋混凝土空心板梁进行了现状调查研究,然后,实施了原梁、常规加大截面法和本论文提案的利用MPC复合材料加固新方法等3种情况(共计9片梁)的原大尺寸破坏性荷载试验,得到了跨中挠度、截面应变等力学参数与荷载的关系。最后,通过不同极限状态(混凝土开裂、钢筋屈服和极限状态)条件下承载能力的分析比较,验证了利用MPC复合材料进行钢筋混凝土空心板桥梁加固新方法可切实提高原钢筋混凝土空心板梁的极限承载能力,为MPC复合材料在钢筋混凝土空心板桥梁加固工程中的应用提供了必要的技术支撑。
First of all, the present situation of the existing research on reinforced concrete hollow slab beams with service life of 35 years has been investigated. Then, three kinds of cases including original beams, conventional cross-section method and the new method of MPC composite reinforcement ) Of the original large-scale destructive load test, get the mid-span deflection, cross-section strain and other mechanical parameters and load relationship. Finally, through the analysis and comparison of the bearing capacity under different limit conditions (concrete cracking, steel yielding and ultimate state), it is verified that the new method of strengthening reinforced concrete hollow slab using MPC composite can effectively improve the limit of the original reinforced concrete hollow slab The bearing capacity provides the necessary technical support for the application of MPC composite materials in the reinforced concrete hollow-slab bridges.