About the article
T.R. Barkaya, S.L. Subbotin, A.V. Gavrilenko, S.I. Kazimirov
The features of modeling post-stressed structures erected using phased tension of monostrends are considered. It is indicated that the separation of the calculated compression force into stages is carried out to reduce the time of the formwork turnover and more fully utilize the mechanical properties of reinforcing ropes due to the early inclusion of concrete in the work and compensation for the stress losses of the first stage. The conclusion is made: as a result of the fact that both its own weight and mounting loads act on concrete that has not reached the design strength and deformability, the structure acquires initial deformations (deflection), which, after hardening, remain in it, therefore, at the stage of secondary compression (and even more so by the time of loading with an operational load) the element already has some geometric nonlinearity. It is noted that the question arises about taking this factor into account when drawing up design schemes of post-stressed structures and the influence of the initial stress state on the distribution of forces in the element.
: reinforced concrete, monolithic concrete, post-stress, reinforcement without coupling, monostrend, geometric nonlinearity, concrete retention