Study on safety assessment methods of gravity anchors based on a simplified mechanical model

Gravity anchor blocks are a common type of ground used for suspension bridges, whose bearing depends on its large body and gravity. As there is no stratum requirement, the safety block important bridge stability. This study summarizes all available estimation indexes, calculating methods, evaluation criteria gravity Ruili bank Banjin Dam grand bridge. The anti-overturning, anti-sliding, base stress, deformation safeties were comprehensively evaluated using methods including suggested specification method (SM), simplified mechanical (SMM), finite element (FEM), results which compared analyzed. reasons errors improved formulas working conditions presented. main conclusions as follows. 1) different indexes according to specifications lack consistency. Moreover, FEM requires that designers have good computer skills has low feasibility in practice. 2) SMM described this study, cover systematic overall, computational formula simple speedy, with relatively conservative practicability. 3) SM, SMM, bank. anti-overturning anti-sliding stability coefficients must meet requirements 2.0. SM cannot be estimate tensile stress under limited conditions. denoted at 2.5 times cable design force, 3.2 P FEM. Deformation calculation not given by but can based elastic mechanics. horizontal displacements load 122 mm 108 44 (composite foundation treated root piles), standard <80 mm. vertical 338 110 123 <160 These findings proved cases lacking regional experience.