08 Chptr - 119 8 Framing Systems Key Terms Beam...

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119 8 Framing Systems Key Terms Beam Cast-in-place concrete Column Compressive stresses Falsework Fenestration Formwork Girder Glued laminated beam Precast prestressed concrete Shoring Sitecast concrete Tendons Tensile stresses Key Concepts The corollaries made between buildings and the human body are instructive. Skeleton, tendons, joints, sheathing, footings—vascular, plumbing, nervous, and control systems —are all terms that can (and do) effectively describe both. Construction is a business of details. Objectives Identify the purpose of framing system drawings. List and describe the common framing systems. Identify common graphic conventions in framing system drawings. Identify the roles of the architect and design consultants in construction drawing production. Reproduce drawings of simple framing systems. Correlate construction processes with construction drawings. 120
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Purpose of Framing Systems Framing systems represent the bones and connective tissue of superstructures—it is through the framing system that the loads imposed on a structure are transferred to the foundation. The variety of structural systems is impressive—numerous combinations of the basic systems in nearly any conceivable configuration can perform the duties expected of structural framing systems. The basic systems are: Cast-in-place (CIP) reinforced concrete Cast-in-place post-tensioned concrete Precast prestressed concrete Structural steel Reinforced masonry Heavy timber Wood light framing Cast-in-place reinforced concrete wall panels tilted into place, with tube steel columns, glued-laminated roof beams supporting manufactured wood trusses, with dimensioned lumber roof joists and plywood or oriented strand board sheathing between trusses is one example of a common structural design for warehouses. CIP Concrete Every system has its strengths and weaknesses. The most successful of them are synergistic in nature (1 + 1 = 3). Concrete is extremely durable in a variety of environmental conditions and is widely available throughout the world. Indeed, there are numerous examples of concrete structures that not only have survived for hundreds of years, but remain functional today. Cast-in place reinforced concrete is economical, fire-resistant, very durable, and extremely flexible from the standpoint of design. The Achilles' heel of concrete—its inability to resist tensile forces—is made manageable by the use of reinforcing steel in areas of high tensile stress. Additionally, the elements in this system are normally chemically compatible and respond similarly when the temperature fluctuates. Cast-in-place post-tensioned concrete is also very economical, and raises simple cast-in-place reinforced concrete to the level that it can support long bridge spans. Precast Prestressed Concrete
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08 Chptr - 119 8 Framing Systems Key Terms Beam...

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