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新的砼结构设计规范(TJ10-89)在正截面强度计算时采用平截面假定之后,统一了各种构件的计算方法,但在小偏心受压构件和受压钢筋达不到屈服强度的大偏心受压、大偏心受拉构件的计算时,就会遇到求解中和轴相对高度ε的三次方程问题,直接求解这些三次方程式是比较繁琐的。本文完全基于新规范的基本方程和平截面假定,利用受压钢筋达不到屈服强度的大偏心受压、大偏心受拉构件相对中和轴高度较小的特点,对这类构件提出了一个简捷求解ξ的方法。计算实例表明,本文的方法计算简单,精度很高,可供工程设计人员参考采用。
The new concrete structural design specification (TJ10-89) uses the flat section assumption in the calculation of the normal section strength, and unified the calculation methods of various components, but the small eccentric compressive members and the stressed steel do not reach the yield strength. For the calculation of eccentrically stressed and large eccentric tension members, the solution of the cubic equation solving the relative height ε of the neutral axis is encountered. It is more complicated to directly solve these cubic equations. This article is based entirely on the basic principles of the new standard and the assumption of a flat section. With the characteristics of large eccentric compression where the stressed steel cannot reach the yield strength, and the fact that the height of the large eccentric tension member relative to the neutral axis is small, a simple method is proposed for such components. Solve the ξ method. The calculation examples show that the method of this paper is simple and accurate, which can be used by engineering designers.