Deflection determination of composite wood bending elements reinforced with cylindrical polymer composite dowels

Abstract

Introduction. At the present time, environmental and logistical problems of the construction of prefabricated and temporary bridge structures are relevant. It is possible to create new constructive solutions based on renewable and recyclable materials to meet the requirements of load-bearing capacity and durability. The aim of the research is to study the operation of dowels in a composite structure and to find the dependence of deflections on the number and material of nagels. Materials and methods. A wooden composite beam combined with polymer composite dowels is proposed as a modern structural solution. There are a number of issues that cast doubt on the feasibility of building modified wooden structures. One of them requires studying how the polymer composite and wood work together: whether the combination of materials will lead to improved mechanical properties compared with classical solutions. The samples of dowel joints with polymer-composite reinforcement have been tested, the load-carrying ability of such a joint has been estimated, and the deformations of composite beams with a varying number of dowels have been studied using the LIRA-SAPR software package. Results. On the basis of normative calculations of dowel load-carrying ability and verification in the second group ofthe limiting states the equation allowing to specify the required number of dowels under the existing deflections was derived. Conclusions. Calculation of deflections of bendable elements have a large number of necessary specifications, but do not take into account the presence of additional reinforcing parts, such as dowels. With the help of the work done the dependence has been obtained which can be implemented in the existing normative calculations to better describe the performance of a real structure.