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加拿大砼规范(1984)建议了两种可供人们选用的剪力设计方法:传统方法及新方法。新方法的理论基础和斜压场理论,本文对该方法做一简单介绍。 1.理论分析根据斜压场理论,剪力设计新方法要求满足平衡条件和压变谐调条件,并要求选用合宜的钢筋和具有斜裂缝的砼(以下简称斜裂砼)应力-应变关系。在选择截面尺寸时,要保证斜裂砼足以抵抗斜压应力,纵向和横向钢筋用量要能与斜压应力场所产生的力相平衡。图1示出了斜压场理论在抗剪分析中的应用。首先将构件的横截面分成一系列横向层,每一层内的纵向应变、剪应力和主压应力倾角都假定为常量。每一层的双向应力和应变由平衡条件、谐调条
The Canada Code (1984) proposes two types of shear design methods that people can choose: traditional methods and new methods. The theoretical basis of the new method and the oblique pressure field theory, this article makes a brief introduction to this method. 1. Theoretical analysis According to the oblique pressure field theory, the new shear force design method requires that the equilibrium condition and the pressure change harmonic conditions be satisfied, and the appropriate stress-strain relationship between the appropriate steel bars and diagonal cracks (hereinafter referred to as slant cracks) should be selected. When selecting the section size, it is necessary to ensure that the oblique cracking is sufficient to resist the oblique compressive stress, and the longitudinal and transverse reinforcement amount should be balanced with the force generated by the oblique compressive stress location. Figure 1 shows the application of oblique pressure field theory in shear analysis. The cross-section of the component is first divided into a series of transverse layers. The longitudinal strain, shear stress, and principal compressive stress dip in each layer are assumed to be constant. The bi-directional stress and strain of each layer consists of balanced conditions, harmonic bars