Chechuga A. The improvement of circular culverts designing method on roads

Thesis for the degree of candidate of technical sciences, specialty 05.22.11 - roads and airfields. - National Transport University, Kiev, 2010. The analysis of working conditions and deformations of circular concrete culverts on highways is made. The theoretical substantiation and the new solution of scientific problem consisting in improvement of a designing method of circular reinforced concrete culverts on highways on the basis of application at calculations the positions of the elasticity theory and the analysis of stress-strain state of a construction "an embankment - a culvert - the basis" are presented in dissertation. It is established that modern state building norms on designing of bridges and pipes not fully contain calculation dependences for the calculation of culverts under highway embankments and need the improvement in this area. The decision based on exact solutions of the elasticity theory, for determining of the forces from external loads and action of a soil own weight is received in the paper. The mathematical model of forces calculation in a construction "an embankment - a culvert - the basis" on the basis of the elasticity theory positions is proved and developed, allowing to define, except the forces acting on the culvert, also the forces in pipe elements and its movement. The experimental, mathematical and numerical modeling of a construction "an embankment - a culvert - the basis", demonstrate the convergence of simulation results that has allowed to develop a number of engineering proposals for the improvement of the stress-strain state and system operating conditions. The design procedure of round concrete culverts on highways taking into account their design features and engineering-geological and soil conditions is developed. Keywords: road, culvert, strain, stress, displacement, the limit state.