Stridor is a sign of upper airway obstruction. In children, laryngomalacia is the most common cause of chronic stridor, while croup is the most common cause of acute stridor.Generally, an inspiratory stridor suggests airway obstruction above the glottis while an expiratory stridor is indicative of obstruction in the lower trachea. laryngeal web, cyst or laryngocele may present with stridor, usually at birth or soon after. Laryngotracheobronchitis (Viral Croup) . The most common cause of acute stridor in childhood is laryngotracheobronchitis, or viral croup.
The load in the floor beam is then transferred to the main load carrying system, such as a longitudinal plate girder. Per Article 9.8.3.1 of the AASHTO LRFD (5 th Edition, 2010), the deck plate is to act as a common flange of the ribs, the floor beams, and the main longitudinal components of the bridge.
A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the deck, the larger the joists. In typical deck construction, with a ledger on one side of the joist and beam on the other, the size of the joists is driven by the size of the deck based on the general maximum spans mentioned above.