ЕФЕКТИВНІСТЬ РЕКОНСТРУКЦІЇ ПРОГОНОВИХ БУДОВ АВТОДОРОЖНІХ МОСТІВ ЗА ДОПОМОГОЮ НАКЛАДНОЇ ПЛИТИ

Abstract

Recently, a monolithic reinforced concrete removable slab has been increasingly used in reconstruction of bridges. It serves as a bridge deck and a supporting element. The purpose of this work is to determine the optimal solutions to reconstruct the spans with the help of a removable slab. The optimality criterion is to increase the load capacity. Varying parameters are the length of the span, the thickness of the removable slab and the step between the beams for prefabricated monolithic spans. For the most common standard projects TP No. 56, TP No. 122-62 (63) and TP Series 3.503-12 of reinforced concrete spans of road bridges, the load capacity of the main beams is determined before and after widening and (or) reinforcing them with a removable slab. On the basis of comparing the graphs of changes in load capacity without a slab and with a removable slab of different thickness, it was determined that the use of the removable slab is advisable for diaphragm spans and for assembled monolithic spans up to 24.0 m. Besides, for TP Series 3.503-12 the reduction of the removable slab efficiency was noticed when he step between the beams increased.