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采用栓钉等柔性抗剪连接件的钢－混凝土组合梁具有良好的延性，是组合梁按简化塑性理论方法设计的前提条件，也是为了保证组合结构在地震作用下具有良好的耗能性能。钢－混凝土简支组合梁的延性在一定的程度上受到剪力连接程度和横向配筋率的影响，本文通过对１２根梁的试验研究和对一些国内外组合梁试验结果的分析，建立了截面屈服曲率和极限曲率及等效塑性铰长度计算公式，根据这些公式得到的组合梁屈服挠度和极限挠度计算值与实测结果吻合良好。试验和分析结果表明，组合梁的延性指标要高于混凝土梁。
Steel-concrete composite beams with flexible shear connectors such as studs have good ductility, and are preconditions for the design of composite beams by simplified plasticity theory methods, and also to ensure that the composite structure has good energy dissipation performance under seismic action. The ductility of steel-concrete simply-supported composite beams is affected by the degree of shear connection and the ratio of lateral reinforcement to a certain extent. In this paper, the experimental study of 12 beams and the analysis of the test results of some domestic and foreign composite beams have been established. The calculation formulae of the yield curvature and ultimate curvature of the section and the equivalent plastic hinge length, the calculated deflection and ultimate deflection of the composite beams obtained from these formulas agree well with the measured results. The test and analysis results show that the composite beam has a higher ductility index than the concrete beam.