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.
Struts and props are vertical elements which support and transfer the load from the purlins to the strutting beams. Strutting beam. Strutting beams support the roof members where there are no load bearing wall studs available. They transfer the load of the roof to load bearing walls. Strutting beams should only support roof loads, and not be used as ceiling joists. Top plate: A top plate is nailed to the top of wall studs. This is the plate that the roofing elements sit on, and effectively the meeting point of the walls and the roof structure. It supports the roof load and helps transfer it down load bearing walls and into the foundations. Truss. A truss is a piece of framework using triangular shapes.