The shape of cross section of gravity dams under basic loads was optimized from an initial quadrilateral region with the stability of dam bodies against sliding and the tensile stress in dam heels taken as restraints 以四邊形為初始域,以重力壩的穩(wěn)定和壩踵拉應力為約束條件,對基本荷載作用下的重力壩基本斷面形狀進行優(yōu)化。
Both the effect of substrate deformation and the state of large deflection of the microbridge are involved in the theoretical expression . furthermore , the distribution of axial stress in the micro bridge is discussed in detail by taking different shapes of cross section into consideration . and a shape factor is introduced into the expression , which simplifies the theoretical expression 理論上對薄膜微橋法的公式進行了進一步的化簡,在考慮襯底變形貢獻和大撓度的基礎上,進一步探討了微機械加工過程中不同橫截面形狀的情形;并對矩形和梯形截面微橋的軸向應力分布作了分析,補充和發(fā)展了薄膜微橋法的理論;引入了橫截面形狀修正因子,簡化了公式的表達和計算。