Papers by Keyword: Panel

Abstract: Failure due to shear deficiency in reinforced concrete (RC) structures, particularly RC beams, is one of the most common problems encountered in RC structures. As a result, the effectiveness of using externally anchored geopolymer fiber mortar panels were investigated in the scope of this experimental study. The variable of the test programmed herein was the change in anchor bolt spacing. Two strengthened beams with 200 mm and 300 mm anchor bolt spacings, respectively, were tested. In addition, one un-strengthened beam was prepared as the reference beam to compared the load-deflection behavior, shear capacity, and failure mode of the strengthened beams. All the beams were tested under monotonic loading until reached the failure load. The experimental results of all strengthening beams showed an increase in the shear strength of the RC beams by 34.9% (spacing 200 mm) and 22.8% (spacing of 300 mm) compared to the reference beam. In addition to increasing shear capacity, the failure mode of the strengthened beam with 200 mm anchors spacing changed from brittle shear failure to ductile flexural failure with increased stiffness. This indicated that geopolymer fiber mortar panel is considered a promising technique that could be utilized to repair and rehabilitate shear deficient RC beams.

Abstract: In this article the use possibility of icosahedron type spatial dot lattices as constructive networks of many-sided domes is considered. The dome triangular panels design with the plywood coverings supported the board edges is accepted. Comparison of results of calculation with the valid work of a triangular Orto-tropic plate at a bend is made. The description of preparation and carrying out static tests of a plywood covering on a cross bend is provided.

Abstract: Static three-point bending test of the laser welded Web-core steel sandwich panel was performed. The deformation and failure of the sandwich panel with narrow weld width T-Joints were investigated. The results indicate that the deformation undertakes the following three stages: elastic deformation, plasticity deformation and T-joints cracking. The initial yield load is 25 kN, The maximum bending load is 54 kN. The high strength rate characteristic not be fully reflected. The finite simulation result shows the whole structure has no chance to reach the designed maximum value when the T-joints formed plasticity rings. Then the plastic region was developing till the weld cracked. We considered that the T-joint’s cracking is a new failure mode for the web-core steel sandwich panel. Thus, the laser welded T-joints with narrow weld width are the weakest location for the total structure. It is very necessary to consider the T-joint’s geometrical and mechanical properties for the total structural design.

Abstract: At present, the trend in new building techniques is to move towards light construction systems, and efforts are also being made to use such techniques with multi-storey buildings. It is a characteristic of the Light Building construction system that a substantial part of the structure of a building is made up of thermal insulation, and heavy and wet processes are eliminated. The article focuses on the options for the use of a specific new technique which utilizes the advantages of large-format construction panels composed of 15 mm thick wood chipboard cladding glued using a polyurethane adhesive directly onto rigid thermal insulation, which is most frequently made from façade polystyrene. No other reinforcement is used. The consistency and load-bearing capacity of the panels are exclusively provided by the gluing of the insulation to the cladding using a polyurethane adhesive. The contribution focuses on the prospects for the use of this interesting technique from the aspect of the fire safety of apartment buildings; so far it has only been used for family homes. The contribution also contains a comparison of construction-related technical and financial indicators of use of this technique with standard construction systems employed for timber structures and also with traditional ceramic masonry from the viewpoint of the fire resistance of individual structures.

Abstract: The objective of this study was to determine the content of free formaldehyde contained in panels of Acacia mangium clippings. The results of the analysis show that the best temperature for a Hantzschen reaction is 60°C. The panels had a linear behavior over the course of the exposure time (168 hours), whereas samples with a lower surface area showed linearity starting at 72 hours. Thus, it is possible to quantify the emission of formaldehyde panels, thereby supporting research to create measures that minimize its release.

Abstract: The detailed topometry optimization of the critical part of an aircraft wing is presented in this article. The integral lower wing structural panel of aircraft in the Commuter category of the CS-23 regulation standard is selected for optimization. The first case demonstrates significant weight savings using modern Finite Element (FE) optimization methods for determined structural constraints. A practical aircraft operation and additional regulation requirements affect optimization constraints in the second case. This detailed optimization also consists of FE model validation, stress analyses and complex load capacity analyses, which are necessary for designed structural modifications with an optimal stress distribution.

Abstract: The high-pile wharf near estuary under wave subjects to great wave force. The wave force can cause destruction of the wharf superstructure. Current research focuses on the case where the forward direction of the wave is perpendicular to or inclined to the wharf front line and mostly applied physics modelling experiments. This paper is to study the case where the wave is parallel to the front line of the high-pile wharf. Take a high-pile wharf near estuary as a model and use the finite element software Ansys to establish the space model. Analysis of internal forces and the destruction of high-pile wharf are made. Meanwhile, the preliminary solution depending on the destruction are proposed, providing references for projects.

Abstract: In the last years, the cladding panel housing fitted with additional contact insulation, manifests an undesirable side effect in the form of local and nationwide assault façade biotic organisms. The issue of biotic attack cladding panel buildings is closely related to the physical aspects of a building and can not be ruled affect the site and the surrounding environment. Contribution aims to define the basic environment criteria that enable the growth of microorganisms on the façade s of panel housing.

Abstract: Three-dimensional (3-D) model of the real terrain is established to see the panel stress and deformation during different periods of the concrete face rock-fill dam (CFRD). Goodman element numerical simulation is adopted in the panel and contact surface. The analysis process can better reflect the stress and deformation distribution of the panel. This research provides an important theory basis for the practical engineering design.

Abstract: The mechanical model for rails and panels of rectangle electromagnetic rail launcher under working condition were simplified as dynamic responses of bi-layer elastic foundation beams. The electromagnetic forces make rails and panels vibrate, which directly affects the launching accuracy. The mechanical equilibrium equation of bi-layer elastic foundations beams was established in this article, and the distributed loads related to armature movement were expressed by Heaviside function. The modes of vibration were given by the boundary conditions. Based on the above results, the dynamic displacement and stress analytical solutions for rails and panels were given by solving homogeneous and nonhomogeneous equation. Dynamic responses of rails and panels were calculated and analyzed against the due kinetic and structure parameters, and the analytical solutions were verified by the comparison with ANSYS results. The research results can be some reference to strength and rigidity design for rails and panels of rectangle electromagnetic rail launcher.