Wood Floor Diaphragm Design
Camila Farah
There are two popular types of diaphragm namely rigid diaphragm and semi rigid diaphragm.
Its light weight results in less force due to inertia during an earthquake and less force means less damage. Boundary nail spacing 6 in. A diaphragm is a flat structural unit acting like a deep thin beam. The term diaphragm is usually applied to roofs and floors.
Learn more about the force transfer around openings ftao method of shear wall analysis including downloadable ftao design tools. A shear wall however is a vertical cantilevered diaphragm. However the assumption of flexible diaphragm is not always valid and could lead to unconservative design if used in the wrong circumstances. Wood diaphragm on reinforced cmu shearwalls neylon et al 2013.
Except that two 3 m x 10 m openings are required in the diaphragm for architectural reasons the rest of the building is the same as in design example. At boundary parallel to load 4 in. Diaphragm length l 24 ft diaphragm width w 24 ft panel edge nail spacing 6 in. Building professionals to design and construct safe strong buildings that meet code require ments while fulfilling lateral design criteria.
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The results show that there can be significant flanking due to the structural path through the floor when there is continuous plywood. Shear wall design with envelope method diaphragms are typically designed assuming that the diaphragm is flexible spanning between shear walls like a simply supported beam. Section 2305 general design requirements for lateral force resisting systems 2305 1 general. To build a diaphragmatic absorber we must first decide what frequency or what frequencies we wish to absorb.
In fact the calculations indicated that for coupled structures the most important noise path is from the source room into the floor through the diaphragm into the adjacent floor and into the receiving room. Let s start with a lower design frequency of 40 hz.
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