钢筋混凝土开裂角软化薄膜模型

开裂角介于固定角和转动角之间,是裂缝实际的开展方向角.通过建立平衡方程、协调方程、钢筋和混凝土本构方程、泊松比效应系数方程,提出了钢筋混凝土开裂角软化薄膜模型,该模型考虑了拉应变与压应变的相互作用.本文还给出从应力到应变的计算方法,与传统从应变到应力的计算方法相比,该方法无须进行反复试算,计算简便.通过与8块钢筋混凝土薄板试验结果的比较,验证了所提出开裂角软化薄膜模型及其算法的正确性.

A cracking angle softened membrane model for reinforced concrete

Cracking angle is between fixed angle and rotating angle, which is the real direction angle of cracks. Based on the stress equilibrium, strain compatibility, constitutive laws of steel bars and concrete, Poisson effect coefficients, a reinforced concrete cracking angle softened membrane model was proposed, which included the interaction between tensile strains and compressive strains. A calculation method from stresses to strains was provided in this paper. Compared with the traditional calculation method from strains to stresses, the proposed calculation method is simpler, and trail and error procedure can be avoided. The calculation results coincide with the test data of eight reinforced concrete panels, which verifies the correctness of the proposed reinforced concrete cracking angle softened membrane model and the related calculation method.