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LRFD - Steel Design

LRFD - Steel Design. Dr. Ali I. Tayeh second Semester. Steel Design Dr. Ali I. Tayeh. Chapter 7. SIMPLE CONNECTIONS.

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LRFD - Steel Design

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  1. LRFD-Steel Design Dr. Ali I. Tayeh second Semester

  2. Steel DesignDr.Ali I. Tayeh Chapter 7

  3. SIMPLE CONNECTIONS Connections of structural steel members are of critical importance. An inadequate connection, which can be the "weak link" in a structure, has been the cause of numerous failures. Failure of structural membersis rare; most structural failures are the result of poorly designed or detailed connections. The problem is compounded by the confusion that sometimes exists regarding responsibility for the design of connections. Modern steel structures are connected by welding or bolting or by a combination of both. Welding has several advantages over bolting. A welded connection is often simpler in concept and requires few, if any, holes . Connections that are extremely complex with fasteners can become very simple when welds are used.

  4. SIMPLE CONNECTIONS In considering the behavior of different types of connections, The tension member splices shown below subject the fasteners to forces that tend to shear the shank of the fastener. Similarly, the weld shown below must resist shearing forces. The connection of a bracket to a column flange, as in next Figure, whether by fasteners or welds, subjects the connection to shear when loaded as shown.

  5. SIMPLE CONNECTIONS

  6. SIMPLE CONNECTIONS BOLTED SHEAR CONNECTIONS: FAILURE MODES The average shearing stress in this case will be

  7. SIMPLE CONNECTIONS BOLTED SHEAR CONNECTIONS: BEARING STRENGTH, SPACING, AND EDGE-DISTANCE REQUIREMENTS A possible failure mode resulting from excessive bearing is shear, tear-out at the end of a connected element, as shown in the next Figure. If the failure surface is idealized as shown in the next Figure, the failure load on one of the two surfaces is equal to the shear fracture stress times the shear area, or

  8. SIMPLE CONNECTIONS The total strength :

  9. SIMPLE CONNECTIONS Summary of Bearing Strength, Spacing, and Edge-Distance Requirements (Standard Holes)

  10. SIMPLE CONNECTIONS Example 7-1: Solution:

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