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The use of cross-type dowels that are battered down with a gunshot method makes it possible to reduce labor intensity and speed up the process of erection and reconstruction of timber bridges. Objective of this paper is to develop a methodology for estimation of the permissible distance between dowels. For this purpose, the method of holographic interferometry in colliding beams was used. The resulting equations were obtained for the patterns of interference fringes observed in reflected light transmitted through the hologram. The investigations showed that the shear component of the strain tensor decreases exponentially with distance from the dowel. The concept of deformation attenuation constant was introduced, i.e. the distance at which the deformation decreases by e times. It is recommended to set dowels at a distance equal to eight attenuation constants. Introduction This paper [1] proposes to use dowels with x-shaped cross-section that are hammered by means of mounting guns. The gunshot method of making doweled connections can be fully appreciated by the builders who construct timber bridges in hard-to-reach areas. The spread of this method is promoted by the widespread use of mounting guns in the construction for the attachment of steel parts to brick or concrete structures. When hammering crosssectioned dowels with knife sharpening with the mounting guns, a dense mortise is formed, which increases the reliability of the connection [2-3]. Until now, no methodology has been developed for determination of the permissible distances between dowels. The study of the strain state of wood is complicated because of the large anisotropy of the material [4]. The optical methods for studying the strain state are used in the study of products made of various materials under various loading methods [5-6]. For the experimental determination of the permissible distance between the axes of the dowels, it is proposed to use the method of recording of holograms proposed by Yu. N. Denisyuk [711]. * Corresponding author: 47604@mail.ru

Use of the cross-type dowels when connecting elements of timber bridges