【摘要】 本文通过系统的试验,研究了钢筋混凝土迭合梁在二次受力下的正截面受力性能及设计方法通过34根迭合梁及5根对比梁的试验结果,证实了迭合梁在二次受力下的“受拉钢筋应力超前”现象,探讨了迭合梁在迭合前弯矩作用下所产生的“荷载预应力”等基本性能,讨论了梁在使用阶段及破坏阶段的特征和规律性。并在试验研究的基础上,提出了迭合梁的计算公式。更多还原

【Abstract】 With a series of tests, the bearing properties of the normal section and design method for reinforced concrete composite beam under two stages loading have been studied. In accordance with the results of testing 34 composite beam and 5 contrast beam, it has been proved that the phenomena of "stress excess of tensile steel" exists in the composite beam under two stage loading, the behaviour of "load prestress" has been studied which will appear when a moment is exerted on the composite beam before the added concrete has hardened. The characters and regularity of composite beam during serviceability-stage and failure stage have been discussed. Based on the experiment data, the analytical formulations of composite beam are propo-sed。更多还原