Mindlin-Reissner Analytical Model with Curvature for Tunnel Ventilation Shafts Analysis

Abstract

The formulation and analytic solution of a new mathematical model with constitutive curvature for analysis of tunnel ventilation shaft wall is proposed. Based on the Mindlin–Reissner theory for thick shells, this model also takes into account the shell constitutive curvature and considers an expression of the shear correction factor variable (αn) in terms of the thickness (h) and the radius of curvature (R). The main advantage of the proposed model is that it has the possibility to analyze thin, medium and thick tunnel ventilation shafts. As a result, two comparisons were made: the first one, between the new model and the Mindlin–Reissner model without constitutive curvature with the shear correction factor αn=5/6 as a constant, and the other, between the new model and the tridimensional numerical models (solids and shells) obtained by finite element method for different slenderness ratios (h/R). The limitation of the proposed model is that it is to be formulated for a general linear-elastic and axial-symmetrical state with continuous distribution of the mass.

Investigations for Design Estimation of an Anisotropic Polymer Matrix Composite Plate with a Central Circular Hole under Uniaxial Tension

“…The displacements variations ( u , v , and w ) are given by the following Equations (15)–(18) as per the middle plane ( z = 0) kinematics for HSDT (Reissner–Mindlin theoretical model) [ 25 , 26 ]. where x , y is the in-plane and z are the transverse directions, and θ x and θ y are the angles of rotation for xz and yz plane, respectively, including extra rotation term about x and y axes because, after deformation, the normal plane is not really orthogonal to the middle plane.…”