SIMULATIONOFTRAFFICWITHDIFFERENTAXLECONFIGURATIONSONTHE VIADUCTSOFN'DJAMENA-CHAD:THECASESOFDEMBÉANDDIGUEL

Abstract

This project entails studying peak hours on the Démbé and
 Daniel viaducts. The study's emphasis is on the flow of heavy
 vehicles and public transportation, which contribute
 significantly to the destruction of large infrastructure (paved
 roads, viaducts, etc.). Viaducts are long-distance bridges that
 are used to cross roadways or railroads. Both of these viaducts
 are 168 meters long, which is significant. Because the Dembé
 and Diguel viaducts are beam-built, ten reinforced concrete
 piers support the decks. The forces produced within the
 structure are flexural forces, thus beam viaducts can only
 respond vertically to their intermediate supports. These
 structures were constructed to improve traffic flow and help
 address the problems of congestion and the high number of
 accidents that have been reported on these roads. In fact, the
 axle movement causes the viaducts to experience repetitive
 load
 impacts.
 Features of the Démbé and Diegol Viaducts Like the other
 three viaducts in the city of N'Djamena, the Dembé and
 Diguel viaducts were built in accordance with beam viaduct
 design and requirements. Four of the city's five viaducts,
 known as the "ouvragesd'art" or OA for short, were opened to
 traffic on Monday, December 31, 2013, by the Ministry of
 Infrastructure and Transport in partnership with N'Djamena
 City Hall. These structures were put in place to enhance traffic
 flow and guarantee increased user safety. The viaducts are
 made up of elevated parts that are 168 meters long, two access
 ramps that are each 152 meters long, two lanes that are each
 3.50 meters wide, and about lower level. various viaducts'
 prompt opening to traffic improved traffic problems in various
 cities. All drivers who recall the nightmare these crossroads
 formerly were—where traffic bottlenecks were almost always
 present—were
 greatly
 relieved.
 Only drivers are permitted to use the top passage of the
 viaducts, according to Decree No. 045/MIT/MISP/2013,
 which was signed by the ministers of infrastructure and
 transportation as well as interior and security. Motorcyclists,
 cart drivers, and pedestrians are not allowed to utilize the
 viaducts; instead, they must use the bike paths that run
 alongside the ground-level highways. It is prohibited for
 trucks weighing more than 3.5 tons to drive on these
 structures. On the ground, however, things are different.
 These viaducts are generally made of prestressed concrete
 decking, followed by asphalt, even though they are only
 meant for vehicles. The deck, which is also surrounded by
 prestressed concrete, can hold up to 35 tons of weight. The
 building material properties of the Dembé viaduct are
 the Démbé and Diguel Viaducts Data is recorded at high
 traffic locations in order to monitor traffic on the viaducts.
 Counting Techniques Viaducts are constructions that
 experience a range of stress levels and complicated loads.
 There are many counting strategies for the two counting
 techniques (permanent and temporary):