One of the directions of modern capital buildings is reduce the cost of manufacturing construction products and increase the reliability of its basic elements. In order to reduce the production time, manufacturing construction products should be made of flat reinforced concrete elements connected to the spatial structure by cables.Due to the reduction of the amount of time for the production of the main elements of construction, it becomes possible to produce materials of low weight for the

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... lapping with the specified dimensions in the plan of structure. The main factor of safe operation is the calculation of the nodes connecting the cable ropes to structure.Analysis of recent achievements and publications has shown that the problem of determining the stress-strain state of the cable rope is not solved, in the scientific literature insufficiently studied the effects of nodes on the state of the entire prefabricated structure.The aim of the article is study the influence of defects on the stress-strain state of cable ropes and develop a method for determining allowable fluctuations of load and displacement forces between ropesfor design nodes of connection.Based on the method of mechanics of layered composite materials, a model is built, the influence of defects of its connection to the stable reinforced concrete floor of building on stress-strain state of cable rope is established. Expressions for determining the permissible rotation of the cross-section of the connected rope to the structure are formed. The mechanism of influence of the nature of rope connection to the structure on its stress-strain state is specified.The expressions for determination of admissible deviations of knots of connection of a cable rope to a building design are received. This makes it possible to determine the permissible error of connecting the ends of the rope to the structure, which improves operational safety. The results can be considered reliable because they are obtained by methods of mechanics of composite materials using analytical results in a closed form