Relevance. Thin-walled structures of shells constitute a large class in architecture, in civil and industrial construction, mechanical engineering and instrument making, aircraft, rocket and shipbuilding, etc. Each surface has certain ad-vantages over the other. So the torso surface can be deployed on the plane of all its points without folds and breaks, with the length of the curves and the angles between any curves belonging to the surface, do not change. The investigation of the stressstrain state of the equal slope shell with a director ellipse at the base is presented to date in a small volume. The aim of the work. Obtaining data for comparative analysis of the results of the stress-strain state of equal slope shells by the finite element method and the variational-difference method. Methods. To assess the stressstrain state of the equal slope shell, the SCAD Office computer complex based on the finite element method and the “PLATEVRM” program, written on the basis of the variational-difference method, are used. Results. The numerical results of the stress-strain state of the equal slope shell are obtained and analyzed, the pros and cons of the results of calculations by the finite element method and the variational-difference method are revealed.

It is hard to imagine architecture and construction without large-span shells of various applications and taking into consideration the requests of architects, the new achievements in numeral modeling of the surfaces and introduction of new groups of tailored surfaces, the appearance of new forms and types of thin-walled shell structures of this kind is inevitable. The bionic method of solving these tasks pushes the boundaries of these opportunities. The subject being studied is the stress strain state of new uncanonical shell "YASUNI", designed of monolithic reinforced concrete with the use of modern finite element analysis settlement system. The form of the shell is built on the basis of images of the Ecuadorian flora. The form of the shell imitates a leaf of a flower laying on the lay of the land. The triangle finite-element mesh is created with a harmonic fusion of lily and daisy in a single structure. The shell is designed as a solid-cast one, made of different classes of reinforced concrete (В25, В30, В35) with thickness from δ = 5 cm to δ = 10 cm with a step 1 cm without contouring beams. The structure is subjected to self-weight. The article introduces the first results of the research of stress strain state of the shell "YASUNI". The authors continue the research of the work this shell with different geometrical parameters, the boundary conditions with the addition of contour elements. Due to the computing complex SCAD OFFICE, precision of which is enough to perform calculations it is possible to reach the most advantageous technical-and-economic indexes of the researched uncanonical shell.Keywords: shell of uncanonical form, bionic architecture, finite element method, triangle finite-element mesh, stressstrain state, monolithic reinforced concrete structure, computer system SCAD Office

Los autores continúan el estudio el estado tenso-deformacional de una nueva forma no-canónica de cascarón estructural. El estudio se realiza sobre un modelo a escala 1:10 de la envolvente “Yasuní” mediante un sistema de cálculo basado en el Análisis de Elementos Finitos de estructuras (AEF) con el empleo de una malla triangular planteada a partir de la concepción arquitectónica que fusiona armónicamente en una sola estructura las formas características de la flora y fauna de la Amazonía ecuatoriana. La envolvente se analiza en un modelo de hormigón armado de diferentes resistencias (f’c = 18.5 MPa, f’c = 22 MPa y f’c = 25.5 MPa), con espesores que varían desde t=5 cm hasta t=10 cm con incrementos de 1 cm, sin vigas de borde y bajo la acción del peso propio. En este artículo se presentan los resultados de la investigación del estado tenso-deformacional del modelo a escala del cascarón “Yasuní” y se observa que a mayor espesor del cascarón las magnitudes de las tensiones normales decrecen, mientras que los valores de las cortantes y momentos flexores se incrementan. Los autores continuarán estudiando esta envolvente, considerando la modificación de diversos parámetros geométricos, de carga, materiales, condiciones de borde y otros.