Abstract. The paper describes some construction solutions for a metalic dome roof of an orthodox church. The authors describe three alternative variants (with different structural diagrams) of designing its dome framework. The paper introduces ribbed ring-shaped, grid and webbed geodesic dome constructions which are aimed to be used in the same operation conditions. The researchers calculated structural design, strength, proportioning of members and weight index as well as geometrically arranged elements of each dome design structure. Then their general total economic parameters were compared.
The research subject is the rotational stiffness of the modular building metal frame nodal connection. The stiffness of nodal connections has a significant impact on the results of calculating the load-bearing frame of a modular building. It is known that absolutely rigid connections exist only in theory. In practice, each nodal connection has a finite stiffness, as evidenced by numerous studies of the researchers. When designing the real objects, the studies on the stiffness of nodal connections of a certain design should be carried out. As a rule, when designing real objects, there is no time to carry out the research. The designer operates with well-known and reliably proven recommendations. It is important for him to have the ready-made solutions for implementation in design practice. Such solutions can be provided on the basis of preliminary studies of the joints’ behavior of the structural elements under load. The article presents a solution to such a problem. The study of the stiffness of the nodal connection with the connected elements parameters variation has been carried out. The purpose of the study is to find the boundaries of design solutions at which the connection can be considered rigid.
The paper considers the joint connection rigidness in a modular building. The joint connection of columns and crossbars with a cross section in the form of square pipes are investigated. The study was carried out by the component finite element method using the IDEA StatiCA software package, the classification of joint connections was adopted according to Eurocode 3. The authors consider two types of joint connections, namely, the ones with an angle stiffener and the ones without an angle stiffener. In the course of research, there were obtained the values of the rotational rigidity of joint connections for various parameters. The boundary characteristics at which joint connections should be considered rigid have been established.
There is given a description of the object of research the support structures of spherical tanks. There are given main defects having been detected during the survey this structures. There are detected main reasons having caused defects of the building structures. There is considered the question of decrease of load bearing capacity of the support structures by results of strength of pillar concrete measurements. There are given recommendations for repair and strengthening of the support structures of spherical tanks for further safety operation.
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