新型预应力钢箱-混凝土组合梁抗弯承载力分析

提出新型预应力钢箱-混凝土组合梁,探讨其应用范围和优点,研究这种梁的极限承载力计算公式及纤维模型分析方法。分别通过理论计算和试验分析该组合梁的极限承载力,并分析钢板厚度、混凝土等级、钢绞线根数、隔板位置等参数对3种跨度的该梁极限承载力的影响,同时与其他模型梁进行比较。结果表明:跨度越大,这种组合梁在极限承载力和挠度方面与其他模型梁相比优势越明显,建议此梁使用在12 m以上跨度的房屋和桥梁结构中。

ANALYSIS OF FLEXUAL BEARING CAPACITY OF PRESTRESSED NEW STEEL BOX CONCRETE COMPOSITE BEAM

A new type of prestressed steel box-concrete composite beam is proposed,whose advantages and applicability were analysed,the formula of ultimate capacity and the fiber model method of the structure were researched as well. Through the theoretical calculation and experiment analysis of the ultimate bearing capacity of the beam,furthermore,it was compared the beams of 3 different spans with other types of beams,the influential parameters on the ultimate capacity such as the thickness of steel sheet,the grade of concrete,the number of steel strand,the location of separator etc. were researched,which demonstrate that the longer the span,the advantage of this composite beam in ultimate capacity and deflection. As a result,it was suggested that the proposed prestressed steel box-concrete composite beam should be used in the house and bridge structure whose span is longer than 12 m.