通过对 1 8m跨雁形板用体外预应力筋加固前后的静载试验 ,分析研究了体外预应力加固雁形板这种薄壁板梁组合体系加固前后的受力性能及力学性能指标改善情况 ,得出体外预应力钢筋对提高梁受力性能的贡献。在此基础上 ,考虑不同布筋形式对加固效果的影响 ,寻求合理的加固方法 ,以满足实际工程需要 Through the static load test before and after reinforcement of 18m span geogrids with external prestressing tendons, the stress performance and mechanical property index improvement of the composite thin-walled beam and slender beam strengthened with in-situ prestressed reinforcement geogrids were analyzed. , Draw the external prestressed steel bar to improve the performance of the contribution of the beam. On this basis, consider the impact of different reinforcement patterns on the reinforcement effect, to seek reasonable reinforcement methods to meet the needs of the actual project