基于软化桁架理论的人防框架梁受剪承载力分析

Shear Bearing Capacity Analysis of Protective Beams on the Basis of Softened Truss Theory

以高强细晶粒钢筋和纤维增强水泥基复合材料人防框架梁为研究对象,基于软化桁架理论,构造水泥基材材料软化特征下的本构模型,应用条带法编制非线性计算程序,计算不同截面、水泥基材强度、钢筋强度和配筋率下人防框架梁斜截面受剪承载力大小,计算结果表明:随着梁截面的增大、水泥基材强度和钢筋强度的提高,受剪承载力基本呈线性增长,但钢筋强度但超过700 MPa后受剪承载力增长减缓,水泥基材强度与钢筋强度的匹配性,影响整体受剪承载力。

On the basis of softened truss theory, established constitutive models for the softening charac-teristics of Fiber Reinforced Cementitious Composite (FRCC), High-stress Fine Grain Bar and FRCC Beams are studied with the application of strip method. Shear bearing capacity analysis is calculated with different sectional, FRCC strength, bar strength and reinforcement ratio. The re-sult manifested that: with the increase of the beam section, the strength of FRCC and the Bar, the shear bearing capacity increases linearly, but increasing slowly when the strength of the Bar exceeds 700 MPa;the compatibility of FRCC and the Bar influences entirety shear bearing capac-ity.