变刚度双向板内力的能量法计算

体外粘贴碳纤维板 (CFRP)或钢板可有效地加固钢筋混凝土结构 ,使其承载力提高 ,受力性能改善。但外贴CFRP或钢板的混凝土板成为突变刚度板 ,其内力计算较为复杂。基于变分原理 ,应用瑞次能量法给出了该类加固板的内力及挠度的计算公式 ,并在此基础上编制了适用于任意长宽比的外贴板加固混凝土双向板的计算程序 ,以便于实际工程的直接应用。

CALCULATION OF THE STIFFNESS - VARYING TWO - WAY RC SLABS BY USING ENERGY METHOD

The RC structures can be strengthened effectively by using of a bonded CFRP or steel plate so that its load bearing capacity can be increased and its behavior carrying load improved.The RC slabs may turn into a stiffness varying plated slabs when bonded with an external CFRP of steel plate,so its internal forces are in much difficulty to be resolved.Based on the variational principles,the calculation formula for the internal forces and deflection of this retroffitted slabs are derived by using Ritz energy method in this paper.Furthermore,the corresponding computing program is also coded,which can be directly applied to the rectangular strengthened RC slabs bonded with an external plate and with any widths ratio in practical engineering.