2_Tension_Members_Lecture - CE 4401 Steel and Reinforced...

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CE 4401 Steel and Reinforced Concrete Design Steel Tension Members -1 CE 4401 STEEL TENSION MEMBERS AISC Manual Part 3 and AISC Specification Chapters D, App 3 Members designed to carry only a tensile force (no shear and no bending moment): Axial force acts through centroid of cross section Figure of Arbitrary Cross Section with Centroid and Differential Area, dA Centroid equations: Loading on Tension Members: 1. Static Loading: Slowly varying load due to D, L, S, W, E : n < 20,000 ( AISC App. 3.1 ) n = number of load cycles 2. Fatigue Loading: Repeated load due to vehicles, cranes, etc. n > 20,000 in a lifetime
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Steel Tension Members -2 LIMIT STATES OF TENSION MEMBERS 1. Serviceability Limit States: Slenderness ratio Limiting Slenderness Ratio (L/r) max 300 “Preferably”! AISC D1 L = length between supports r = radius of gyration = A I / L/r = member slenderness ratio For a built-up member connected intermittently along the length (e.g., a double angle), add enough intermittent connectors to ensure that individual component L individual /r individual is less than built-up L built-up /r built-up : For example: 300 max max sin sin angle double angle double angle gle angle gle r L r L If L/r is too large Æ sagging, hard to handle during erection, vibration problems Æ this is essentially a stiffness criterion
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This note was uploaded on 06/09/2010 for the course CIVIL 4401 taught by Professor Shield during the Fall '09 term at University of Minnesota Crookston.

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2_Tension_Members_Lecture - CE 4401 Steel and Reinforced...

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