新型外包钢-砼组合梁的受力性能分析

Analysis of Flexural Behavior of Steel-encased Concrete Composite Beams

针对普通钢-混凝土组合梁存在的一些问题,提出了一种新型的组合梁外包钢 -混凝土组合梁。为了研究其受力性能,进行了三根足尺简支梁的试验研究,并通过对构件荷载 -位移曲线、荷载-应变曲线和应变沿截面高度分布的分析,认为外包钢 -混凝土组合梁有较优越的力学性能和良好的应用前景。基于组合梁弹塑性理论,推导出梁的正截面承载力的计算公式,与试验结果比较吻合。最后,为了便于其工程中的应用,根据试验结果,提出了适于该种组合梁的一些构造措施。

Aiming at some problems of common steel-concrete beams, this article puts forward a new type of composite beam-steel-encased composite beam. To study its mechanical character, three simple supported samples with full size were tested. The load-deflection curves, load-strain curves, and strain distribution along beam height were analyzed. From the results we can draw the conclusions that this kind of beam has good mechanical performance and application prospect. Based on elastic-plastic theory of composite beam, a formula for bearing capacity of normal section was derived. The theoretical results are in good agreement with the measurement ones. Finally, to facilitate its application in engineering, some suitable construction measures are brought forward according to the test results.