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Unformatted text preview: CONNECTION DESIGN-DESIGN REQUIREMENTS CONNECTION DESIGN – DESIGN REQUIREMENTS 29 1.0 INTRODUCTION Steel sections are manufactured and shipped to some standard lengths, as governed by rolling, transportation and handling restrictions. However, most of the steel structural members used in structures have to span great lengths and enclose large three- dimensional spaces. Hence connections are necessary to synthesize such spatial structures from one- and two-dimensional elements and also to bring about stability of structures under different loads. Thus, connections are essential to create an integral steel structure using discrete linear and two-dimensional (plate) elements. A structure is only as strong as its weakest link. Unless properly designed, the connections joining the members may be weaker than the members being joined. However, it is desirable to avoid connection failure before member failure for the following reasons: • To achieve an economical design, usually it is important that the connections develop the full strength of the members. • Usually connection failure is not as ductile as that of steel member failure. Hence it is desirable to avoid connection failure before the member failure. Therefore, design of connections is an integral and important part of design of steel structures. They are also critical components of steel structures, since • They have the potential for greater variability in behaviour and strength, • They are more complex to design than members, and • They are usually the most vulnerable components, failure of which may lead to the failure of the whole structure. Thus designing for adequacy in strength, stiffness and ductility of connections will ensure deflection control during service load and larger deflection and ductile failure under over- load. Hence, a good understanding of the behaviour and design of joints and connections in steel structures is an important pre-requisite for any good design engineer. This chapter gives an overview of the design of connections in steel structures. The following five chapters deal with bolted and welded connections in greater detail. 2.0 COMPLEXITIES OF STEEL CONNECTIONS Margins of safety of any design, in particular that of connection, involves uncertainty due to random nature of (a) the forces acting on the structure and (b) the actual strength of the joint designed. © Copyright reserved Version II 29 - 1 CONNECTION DESIGN-DESIGN REQUIREMENTS The randomness of the loads has been discussed in an earlier chapter; that of the actual strength is due to the variability of the dimensions of the elements and that of the strength of constituent material as well as errors due to simplification in analysis and design....
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- Spring '12
- Force, CONNECTION DESIGN-DESIGN REQUIREMENTS, HSFG