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前言采用弹性理论求解平板问题的方法很多,但普遍存在计算繁琐的缺点,当板的形状复杂时,计算更为困难。对于钢筋混凝土板,当荷载和内力的关系超过弹性阶段后,材料产生非弹性变形而引起内力重分布,使板的承载能力、变形和裂缝与按弹性计算所确定者有较大的差异。因此近二十多年来很多采用塑性分析,即用极限荷载方法求解钢
Foreword There are many methods to solve the flat panel problem using the elasticity theory, but there are common deficiencies in calculation. When the shape of the board is complex, the calculation is more difficult. For reinforced concrete slabs, when the relationship between load and internal force exceeds the elastic phase, the material generates non-elastic deformation and causes internal force redistribution, which makes the bearing capacity, deformation and cracks of the slab different from those determined by elasticity calculation. Therefore, in the past 20 years, many plastic analysis methods have been used, namely the use of ultimate load method to solve steel.