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.
I don't know about some of the rest of you, but hiring an engineer was not an option and we are allowed, by the building code to make our own beams. My back deck is in excess of 53 feet, and we laminated, in accordance with the blueprints, a beam made of 2 x 10's. want to laminate a beam for a small 4 foot porch roof. The spans on the roof are 18 and 20 feet I'm using 2 x 6 for the support beam.