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概述钢筋混凝土常有偏心受压或偏心受拉构件,这类构件需满足强度及使用的要求,因而需要简单的计算抗裂度及裂缝宽度的公式。我国现行规范给出了受弯、轴心受拉构件抗裂度或裂缝开展宽度的计算公式。为了设计实用,对受弯、偏心受压、偏心受拉、轴心受拉的钢筋混凝土构件,探讨一个简单通用的抗裂度及裂缝宽度计算公式,是有实用意义的。为此,我国各有关单位进行了大量的试验。抗裂度计算为了计算混凝土、钢筋混凝土构件的抗裂度,假定沿截面高度的应力应变分布如图1所示。
Overview Reinforced concrete is often subject to eccentric compression or eccentric tension members. This type of component needs to meet strength and application requirements, and therefore requires a simple formula to calculate crack resistance and crack width. China’s current specification gives the calculation formulas for the bending resistance, the crack resistance of the axial tension member or the crack development width. In order to design practicality, it is practically useful to discuss a simple and universal crack resistance and crack width calculation formula for reinforced concrete members subjected to bending, eccentric compression, eccentric tension, and axial tension. For this reason, a large number of tests have been conducted by various relevant units in China. Calculation of crack resistance In order to calculate the crack resistance of concrete and reinforced concrete members, the distribution of stress and strain along the height of the section is assumed as shown in Fig. 1.