Abstract
Trusses are structural systems commonly used in projects, being employed mainly in roof structures, present in most rural buildings. The design of trusses, as well as other structural systems, requires the determination of displacements, strains and stresses. However, the project is developed from an ideal model of calculation, considering free rotation between the elements of a connection. This paper presents a computer program for the analysis of bidimensional wooden trusses with connections formed with two screws per node. The formulation is based on the flexibility method, taking into account the influence of the effect of semi-rigid connections formed by two screws. An example of a structure is presented and analyzed by the program developed here, highlighting the importance of behavior analysis on semi-rigid connections.
Highlights
The use of wood as a structural element in Brazil has grown over the past few years because of the research carried out in order to make it more competitive than other construction materials.In the case of structures, wood can be used in temporary works, such as anchors and forms, or as a structural element, such as beams, columns, poles, trusses and more
The flat design of roof structures is usually done through ideal calculation models, in which the links are considered as perfectly flexible in rotation, i.e., transmitting only normal forces among their structural components
The present work aims at developing a computer program PS-R (Semi-Rigid Porch), developed from the foundations of the flexibility method, to evaluate the effect of semi-rigid connections formed by two screws in wooden plane structures of truss type
Summary
The use of wood as a structural element in Brazil has grown over the past few years because of the research carried out in order to make it more competitive than other construction materials. In the case of structures, wood can be used in temporary works, such as anchors and forms, or as a structural element, such as beams, columns, poles, trusses and more. The flat design of roof structures is usually done through ideal calculation models, in which the links are considered as perfectly flexible in rotation (trusses), i.e., transmitting only normal forces among their structural components. KRISHNAMURTHY et al (1979) applied the Finite Element Method (FEM) to obtain moment-rotation curves of connections with steel sheets, and JONES et al (1983) studied the influence of semi-rigid connections in steel columns. The present work aims at developing a computer program PS-R (Semi-Rigid Porch), developed from the foundations of the flexibility method, to evaluate the effect of semi-rigid connections formed by two screws in wooden plane structures of truss type. A roof structure is evaluated by the PS-R program in order to verify the importance of this analysis
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