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.
1 STEEL BEAMS. 2  Most steel beam bridges in Ohio consist of four or more lines of beams which are continuous over the piers (no joints except at the ends/abutments). The steel beams consist of either rolled, wide flange beams or built-up girders (for longer spans) made up of flanges, webs and stiffeners welded or riveted together. It is important to recognize the difference between rolled beams and built-up girders.