DETERMINATION OF LONGITUDINAL FORCE TRANSFER ECCENTRICITY THROUGH SUPPORT CONNECTIONS IN GLULAM ARCHES OF TRIANGULAR SHAPE

Abstract

The nature of the distribution of compressive stresses in the support and ridge joints of the glulam arch of triangular shape with a span of 24 m has been investigated. Arch joints made with help of skew notched connections which were constructively transferred from central axes of half arches in order to obtain additional eccentricities of compressed forces acting normal to the surface of butt support and causing occurrence of unloading moments.

It has been proved numerically that the bearing stresses of the ends of half – arches of three-hinged arches of triangular shape are not evenly distributed along the height of the butt supports, as is customary in traditional calculations of support nodes of arches of different shapes. In fact, these stresses change practically according to the linear law. This circumstance allows not to solve numerically the contact problem "the end of the half - the support", but knowing the values of normal to the ends of the half longitudinal compressive forces and the length of the compressed sections of the butt supports, analytically determine the value of eccentricities of these forces relative to the central axes.

A new approach to the calculation of support and ridge nodes of glulam arches made with a skew notched connection, which excludes the iterative process, is proposed.