This article deals with the issue of calculating combined plywood-metal flooring as a horizontal disk of stiffness, taking into account the structural non-linearity. An analytically obtained method calculating the shear stiffness of the flooring under the action of horizontal loads is proposed.
The task was to derive a three-line correlation - relationship for the fictitious connection operation, based on the constructively nonlinear operation of the flooring. Based on the proposed analytical method of calculating the shear stiffness of the flooring under the influence of horizontal loads, the work of the flooring is modeled as part of the design scheme shown in the figure. The resulting diagram of fictitious relationships was introduced as a characteristic of nonlinear work. In manual calculation in the derivation of the analytical formulas, the compound was considered as a pure hinge. We can conclude that the proposed analytical method of calculating the shear stiffness of the flooring when it is working on a horizontal load, taking into account the structural non-linearity.
This article discusses the design of pedestrian bridges. When designing pedestrian bridges, engineers are guided mainly by the static characteristics of the types of spans under consideration. If you want to build a load-bearing beam structure of a large span, you cannot lose sight of their relatively large mass and low stiffness due to the length of the bridge. These factors lead to a low natural frequency close to the frequency of pedestrian load, in the form of people passing through this structure, which, in turn, act as recipients of vibrations. The structure is a metal span restructure with two I-beam main beams with a solid sloping wall, an orthotropic plate of the passer-by part below, a calculated width of 44.0 m, a total length of 44.6 m and a pedestrian dimension of 3.25 m. In the course of dynamic tests of the pedestrian bridge span, experimental values of the natural vertical vibration frequencies were determined, followed by the determination of the attenuation decrement. The natural oscillation frequency was 2.0 Hz, which corresponds to a period of 0.5 s oscillation.
The article presents the development and research results of the stress-strain state of a new composite bracket structural solution. The basic scheme of the invention and its application in hinged facade systems are described. The main feature of the developed design solution is the production of various shapes profiles made of aluminum alloys: a U-shaped profile with a wall thickness that varies along the length and an L-shaped uneven profile. Both parts of the bracket are made of aluminum alloys using extrusion method, which allows producing a profile of different shape on terms of area. The results of numerical modeling and selection of optimal geometric and physical-mechanical characteristics of the developed composite bracket in the software package are presented. The actual loads, impacts and operating conditions are taken into account. Based on the results of numerical studies, it is found out that the developed type of the bearing bracket meets the requirements of strength, rigidity and stability. The additional optimization allows reducing the weight of the bracket compared to the original model without significantly reducing the bearing capacity.
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