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混凝土梁体在荷载作用下开裂,未裂截面的中性轴位置由于开裂截面的开裂而发生变化。文章在推导开裂截面初始时刻中性轴高度计算公式的基础上,进一步推导了未裂截面中性轴位置变化的通用计算公式,这样便可方便确定任意截面的受压区高度,对于精确计算开裂截面处的钢筋应力打下了基础,从而使得建立预应力混凝土梁考虑时变效应的长期裂缝宽度计算公式的建立成为可能。
The concrete beam body cracks under load and the neutral axis position of the uncracked section changes due to the cracking of the cracking section. Based on the calculation formula of the neutral axis height at the initial moment of cracked section, the article further derives the general formula for calculating the position of the neutral axis in the uncracked section so that the height of the compression zone in any section can be easily determined. For accurate calculation of cracking The stress of the steel bar at the cross section laid the foundation, making it possible to establish the formula for calculating the long-term crack width considering the time-varying effect of prestressed concrete beams.