【摘要】 提出了拱坝等效应力分析的有限元内力法。该法首先按常规方法建立拱坝及地基在外荷载作用下的有限元平衡方程,求解结点位移和单元应力,然后将坝体分解为拱系和梁系,根据拱和梁的内力平衡条件求解指定截面上的约束内力,并进而求解相应截面上的内力(弯矩、轴力、剪力等)和坝体内任一点的等效应力。文中推导了相应的计算公式,并对典型的圆筒拱坝分析了径向网络尺寸对等效应力计算结果的影响,从而说明了该方法的正确性。更多还原

【Abstract】 In this paper,met hod of finite element internal force for arch dam stress analysis is presented.F ollowing the routine method,finite eleme nt balance equation of dam body and dam foundation under water pressure and body force is established to solve the nodal displacements and element stresses.Base d on the condition of internal force bal ance of arch system and cantilever syste m,internal constraining forces of given sections are solved by dividing the dam body into arch system and cantilever sys tem.Further more,not only internal force s of given sections such as moment,axial force and shear force but also equivale nt stress within dam body can be solved. In addition,calculation formulas are der ived in this paper and a typical cylindr ical dam,to which different finite eleme nt meshes along the radial direction are applied,is given to prove that the meth od proposed in this paper is reliable,re asonable and effective.更多还原