钢-混凝土组合梁在单调荷载下的变形及延性

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。

Analysis and Calculation of Deformation and Ductility of Composite Steel Concrete Beam under Monotonic Loading

The good ductility of flexible connectors such as studs enables it valid to use simple plastic theory in the design of composite steel concrete beams and provides the composite structures with good energy dissipation ability under earthquake actions . The ductility of simply supported com- posite beams is influenced by the degree of shear connections and the ratio of transverse reinforce- ment in slab . Based on the experimental results of 12 composite beams carried out by the authors and 9 beams tested by others, the formulae for calculating the yield and ultimate curvatures of cross-section and the length of equivalent plastic hinge are suggested . The predicted yield and ulti- mate deflections obtained from these formulae are in good agreement with the experimental re- sults . It is shown that the ductility ratio of composite beams are higher than that of the respective re inforced Concrete beams .