部分预应力砼梁开裂截面中和轴高度的一般方程及简化计算
孙宝俊,吕志涛
General Equation and Simplified Calculation for Determining Neutral Axis in Partially Prestressed Concrete Beam after Cracking
Sun Baojun Lu Zhitao ( Southeast University )
建筑结构学报 . 1992, (06): 21 -29 .