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一、现有规范中确定刚性基础范围的依据用“m”法计算桥梁墩台基础时,我国现行的桥涵规范规定:“当基础(沉井、桩基、管柱)置于地面或局部冲刷线以下的深度h≤2.5/α时,可将基础视为具有无限大刚度,h为基础的深度,α为基础的变形系数;α=(mb_0/EI,b_0)~(1/5)为基础的计算宽度,E为基础圬工的弹性模量,I为基础的平均截面惯性矩,m为土的地基系数的比例系数”。这就是说,当αh≤2.5时,基础构件本身的弹性变形可略去不计(因EI为无限大),而按刚性基础进行静力分析。这一规定是从国
First, the existing norms to determine the basis of the scope of the rigid base “m” method to calculate the bridge piers and abutments, China’s current bridge and culvert specifications: "When the foundation (caisson, pile, column) on the ground or local scour When the depth below the line is less than or equal to 2.5 / α, the foundation can be considered as the foundation with infinite stiffness and depth h, α is the deformation coefficient based on α = (mb_0 / EI, b_0) ~ (1/5) Basis of the calculation of the width, E based on the elastic modulus of workers, I based on the average cross-sectional moment of inertia, m is the coefficient of the soil coefficient of proportion. That is to say, when αh≤2.5, the elastic deformation of the basic component itself can be neglected (because EI is infinite), and the static analysis is carried out on a rigid foundation. This requirement is from the country