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针对钢-混组合连续梁桥负弯矩区易开裂难题,采用高抗裂的高强有机聚合物纤维混凝土代替普通混凝土,在跨中对称荷载作用下,试验研究钢-高强有机聚合物纤维混凝土组合连续梁的力学性能,探明高强有机聚合物纤维及其掺量对组合梁抗裂性能的影响作用。结果表明,高强有机聚合物纤维对钢-混组合梁抗裂性能和结构延性的提升影响较大,对承载能力的影响较为有限;高强有机聚合物纤维掺量增高,结构抗裂性能提升,开裂弯矩增大,裂缝发展受到抑制;通过荷载-纤维掺量关系曲线,获得了高强有机聚合物纤维的最佳掺量取值4kg/m3。研究成果为高强有机聚合物纤维混凝土在钢-混组合连续梁桥中的应用提供了技术支撑。
In order to solve the problem of easy cracking in negative moment area of steel-concrete composite continuous beam bridge, high-strength organic polymer fiber concrete with high crack resistance was used instead of ordinary concrete. Under mid-span symmetrical load, Mechanical properties of continuous beams to determine the high-strength organic polymer fibers and their content of composite beam anti-cracking performance. The results show that high-strength organic polymer fiber has a great influence on the crack resistance and structural ductility of steel-concrete composite beams, and has a limited impact on the bearing capacity. The content of high-strength organic polymer fibers increases, the structural cracking resistance increases, The bending moment increases and the development of cracks is restrained. Through the curve of load-fiber content, the optimal dosage of high-strength organic polymer fiber is 4kg / m3. The research results provide technical support for the application of high-strength organic polymer fiber reinforced concrete in steel-concrete composite continuous beam bridge.