Larger-diameter fasteners are generally favorable in connections.00 2.47 1. and common bolts manufactured under ASTM A307.10 of the AISC specification requires that they be used for the following joints: 1. Connections of all beams and girders to columns and any other beams and girders on which the bracing of columns is dependent in structures more than 125 ft (38 m) in height Downloaded from Digital Engineering Library McGraw-Hill (There is no recognized procedure for tightening these bolts beyond this point.
Pretensioned structural bolts must be used in certain locations. Figure 1.2.2 Unfinished (machine) or common bolts. which were referred to previously as common bolts. Structural bolts (A325 and A490) can be installed pretensioned or snug tight. Common bolts (A307) can be installed only to the snug-tight condition. ordinary bolts.1 High-strength structural-steel bolt and nut. The A325 and A490 bolts are structural bolts and can be used for any building application. Any use is subject to the Terms of Use as given at the website. Column splices in all multistory structures more than 125 ft (38 m) in height 2.Fasteners and Welds for Structural Connections Fasteners and Welds for Structural Connections 3 Figure 1. The use of these bolts is limited primarily to shear connections in nonfatigue applications. Pretensioned means that the bolt is tightened until a tension force approximately equal to 70 percent of its minimum tensile strength is produced in the bolt. Snug tight is the condition that exists when all plies are in ) Copyright © 2009 The McGraw-Hill Companies.accessengineeringlibrary. Twist–off-type tension control fasteners manufactured under ASTM F1852 and F2280 are also available and can be treated as subsets of A325 and A490. It can be attained by a few impacts of an impact wrench or the full effort of a man using an ordinary spud wrench. This chapter is based on the bolting and welding requirement specifications of the American Institute of Steel Construction (AISC).) 1.1 Types of bolts There are three kinds of bolts used in steel construction.Ī307 bolts. are not currently used for new structures and will not be considered here.2 Bolted Connections 1.accessengineeringlibrary. Connections are an intimate part of a steel structure and their proper treatment is essential for a safe and economic structure. This chapter will present the basic properties and requirements for bolts and welds.2. Downloaded from Digital Engineering Library McGraw-Hill (Chapter 2 will develop this material. These are high-strength structural bolts manufactured under the American Society for Testing and Materials (ASTM) Specifications A325 and A490. Rivets.1 Introduction There are two common ways to connect structural steel members-using bolts or welds. An intuitive knowledge of how a system will transmit loads (the art of load paths). “Specification for Structural Steel Buildings. and an understanding of structural mechanics (the science of equilibrium and limit states). are necessary to achieve connections which are both safe and economic.
All rights reserved.1 (2006).Fasteners and Welds for Structural Connections 2 Chapter One (Courtesy of The Steel Institute of New York. Any use is subject to the Terms of Use as given at the ) Copyright © 2009 The McGraw-Hill Companies.
GA Chapter Fasteners and Welds for Structural Connections William A. Eng.7 Edge distances and spacing of bolts 1. Technical Manager.8 Obliquely loaded concentric fillet weld groups 1.3 Welded Connections 1.2 1.3.3 1.E.8 Installation 1.4 1.2.2.6 2 2 2 4 5 5 7 8 9 11 14 14 20 25 25 26 30 32 34 36 1 Downloaded from Digital Engineering Library McGraw-Hill (Thornton.3.com) Copyright © 2009 The McGraw-Hill Companies. All rights reserved.1 Introduction 1.2 Bolted Connections Types of bolts Washer requirements Pretensioned and snug-tight bolts Bearing-type versus slip-critical joints Bolts in combination with welds Standard.Struct.4 1.1 1.3.3. Any use is subject to the Terms of Use as given at the website.4 References 1.5 1.2. P.2.7 Types of welds Welding symbols Welding material Welding positions Weld procedures Weld quality Methods for determining strength of skewed fillet welds 1. Steel Consultant.E.accessengineeringlibrary.Source: Handbook of Structural Steel Connection Design and Details 1 Larry S.I.3 1.