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为探讨高强新型外包钢-混凝土组合梁的延性性能,对5根高强新型外包钢-混凝土组合梁进行抗弯试验。根据试验结果对组合梁的位移延性比、曲率延性比与耗能进行分析,并通过弯矩曲率法对其进行全过程模拟,从曲率延性比的角度对混凝土强度、外包钢板屈服强度的影响规律进行定量模拟分析,为工程设计提供技术参考和理论指导。研究表明:弯矩曲率法可有效避免传统有限元模拟中存在的不收敛、计算效率较低等问题,且模拟结果与试验结果吻合良好,可用于高强新型外包钢-混凝土组合梁受力与延性性能的模拟研究;提高混凝土强度以及降低外包钢强度都有利于高强新型外包钢-混凝土组合梁延性的提高,且这种影响会随着混凝土强度以及钢板强度的提高而减小。
In order to investigate the ductility of high-strength new type of steel-encased concrete composite beams, five high-strength new type of steel-encased concrete composite beams were subjected to the bending test. According to the test results, the displacement ductility ratio, curvature ductility ratio and energy dissipation of the composite beam are analyzed, and the whole process simulation is carried out by the method of moment curvature. From the perspective of the curvature ductility ratio, the influence law of the concrete strength and the yield strength of the outsourcing steel plate Quantitative simulation analysis for engineering design to provide technical reference and theoretical guidance. The results show that the moment curvature method can effectively avoid the problems of non-convergence and low computational efficiency in the traditional finite element simulation. The simulation results are in good agreement with the experimental results and can be applied to the mechanical properties and ductility of the new CFRP-composite beams Simulation results show that increasing the strength of concrete and reducing the strength of the steel are beneficial to the ductility of the new high-strength steel-encased concrete composite beam, and this effect will decrease with the increase of the strength of concrete and the strength of the steel plate.