Tension Member Connections

Slides:



Advertisements
Similar presentations
COMPRESSION FIELD THEORY FOR SHEAR STRENGTH IN CONCRETE
Advertisements

BEAMS (FLEXURE) BEAM- COLUMNS SHEAR / CONC. LOADS
WELDSCOLUMNSWILDCARD Match these descriptions of column slenderness and behavior: short, long, in between inelastic buckling, elastic.
Design of Steel Tension Members
Basic Concepts in Ductile Detailing
Teaching Modules for Steel Instruction
BOLTS TENSION MEMBERS AISC / LRFD WILD CARD
Success with ModelSmart3D Pre-Engineering Software Corporation Written by: Robert A. Wolf III, P.E. Copyright 2001, Pre-Engineering Software Corporation,
Design of Steel Flexural Members
ENCE 455 Design of Steel Structures
3D Analysis with AASHTOWare Bridge Design and Rating
Tension Members Last Time
68402: Structural Design of Buildings II
Tension Members Chap. (3)
Connection Design.
Design of Tension Members
Shear Design of Beams CE Steel Design Class By, Amit H. Varma.
Shear Design of Beams CE Steel Design Class By: Amit H. Varma.
CTC 422 Design of Steel Structures
Design of Tension Members
PCI 6th Edition Connection Design.
BOLTS TENSION MEMBERS AISC / LRFD WILD CARD
Connection of flange plate with web
Shear - Tensile - Compression Stresses Slip Ted 126 Spring 2007.
CM 197 Mechanics of Materials Chap 20: Connections
Tension Members Last Time
CONNECTION DESIGN Connections must be designed at the strength limit state Average of the factored force effect at the connection and the force effect.
Chapter 11 Flange splice.
ENCE 455 Design of Steel Structures
Rehabilitation and maintenance of buildings - 03
Dr. Ali I. Tayeh First Semester
By: Prof Dr. Akhtar Naeem Khan
Connections and Connectors This presentation is prepared using: Structural Steel Design by McCormac and Csernak 2012 AISC Manul 13 th ed (14 th )
Design of Tension Members
Chapter 10 Web splice.
Composite Beams and Columns
I. Truss Bridge Gussets Background
LRFD-Steel Design Dr. Ali Tayeh Second Semester
LRFD- Steel Design Dr. Ali I. Tayeh second Semester Dr. Ali I. Tayeh second Semester.
LRFD-Steel Design Dr. Ali Tayeh Second Semester
Structural Drafting Connection Details and Gages.
Overview of Mechanical Engineering for Non-MEs Part 2: Mechanics of Materials 6 Introduction – Concept of Stress.
Teaching Modules for Steel Instruction TENSION MEMBER Design
Welded joints.
(a) (b) A325-N or A325-X or A490-N A490-X Shear plane
BOLTED CONNECTIONS.
WELDED CONNECTIONS I.
1 PennDOT Truss Gusset Plate Analysis and Ratings Spreadsheet Overview Karim Naji Assistant Structural Engineer FHWA PA Division
IS 800 – 2007 LUG ANGLE TENSION SPLICES SHEAR LAG
Built-up Compression Members
第二章 拉力桿件. 拉力桿件 常見受拉桿件型式 10 應力 - 應變曲線 應力 - 應變曲線 降伏強度 極限強度 應變 應力 破壞 彈性 塑性 應變硬化 頸縮 FuFu FyFy.
Design of welded joints
Visit for more Learning Resources
CONNECTION DESIGN Connections must be designed at the strength limit state Average of the factored force effect at the connection and the force effect.
Introduction – Concept of Stress
Concept of Stress.
FRAMING CONECTIONS Session 3.
CONNECTIONS IN STEEL STRUCTURES
Design of Tension Members
SNS COLLEGE OF TECHNOLOGY, COIMBATORE-35 (AN AUTONOMOUS INSTITUTION)
CE Steel Design Class By, Amit H. Varma
Introduction – Concept of Stress
CONNECTIONS IN STEEL STRUCTURES IS CRITERIA
BFC Structural Steel and Timber Design
CONNECTION Prepared by : Shamilah
EAT 415 :ADVANCED STEEL BUILDING DESIGN PLATE GIRDER
Concept of Stress.
ROOFS.
Structural Fasteners Chap. (4) Non-Structural (A-307) Bolts A325
Chap. (5) Welding Definition: A process of joining two metal pieces by heating to a fluid slate (melting), with or without filler material or pressure.
Presentation transcript:

Tension Member Connections Three methods of connecting steel members: Rivets Bolts Welds

Advantages of Welding Materials saving (often no connecting members necessary) Quieter than impact wrenches normally used for bolts More forgiving when dimensions don’t match Forms rigid joints Simpler detailing

Advantages of Bolts Does not require as highly skilled workers Requires less equipment Reduced risk of fire Better quality control

Types of Connections by Bolt Action

Bolts Available Bolts A307 – Non-high strength bolts A325 A490 Strengths given in Table J3.2 (p. 16.1-61) - High strength bolts

Bolt Holes (Sizes in Table J3.3) p. 16.1-62 Standard Oversized Short-slotted Long-slotted Connection types Bearing Slip-critical

Spacing, Edge, and End Distances Minimums Center to center ≥ 2 2/3 x bolt diameter, preferably 3 x bolt diameter Edge distance – Table J3.4 For maximum bearing Strength (pitch): (J3.10) Center to center ≥ 3 x bolt diameter Edge (end) distance – p. 7-35, Table 7-13

Spacing, Edge and End Distances Maximums Center to Center (pitch) ≤ 24 x thickness of thinner part ≤ 12” Edge distance ≤ 12 x thickness of part ≤ 6”

Bolt Shear Strength J3.6→ФFnAb Tabulated on page 7-33, Table 7-10 Ф – Table J3.2 Fn – Table J3.2 Ab – Area of bolt Tabulated on page 7-33, Table 7-10

Bearing Strength at Bolt Holes J3.10 → ФRn Ф – 0.75 Rn given by equations J3-2 Tabulated on page 7-34,35

Analysis of Tension Connection Example (p. 15 notes) Two A36 steel plate tension members have been connected with a lap splice using ¾” diameter A307 bolts, arranged as shown. Find the allowable service live load. Also find required distances a and b. Assume service live load is two times dead load. Plate edges are likely to be sheared.

Analysis of Tension Connection Example (p. 15 notes) 3/8 in. P P 3/8 in. a 3 in. a b 10 in. P P b

Boted Tension Connection Design Procedure p. 15 -16 notes

Bolt Design Example p. 16 notes Design a pair of splice plates to connect the two parts of the channel tension member shown. The forces in the member are 110 kips live load and 69.7 kips dead load. The bolts in the surrounding joints are 1” diameter A325N. All steel is A36. Slip is not critical.

Bolt Design Example p. 16 notes

Block Shear Rupture J4.3 – Equations J4-3a and J4-3b

Welded Tension Connections Two primary types of welds:

LRFD Specification for Welds Effective throat thickness = 0.707 x l Where l = weld size or leg size

Limitations on Fillet Welds Minimum weld size – Table J2.4 Maximum weld size: along edge of material < ¼” thick = thickness of material along edge of material > ¼” thick = material thickness - 1/16” Minimum length Greater than 4 x weld size and, If longitudinal filet welds are used alone in end connections of flat bar tension members length ≥ perpendicular distance between them (p. 16.1-234)

Limitations on Fillet Welds Intermittent fillet weld segments must be at least 4 times the weld size and ≥ 1 ½” Lap joints require a lap of at least 5 times the thickness of the thinner part joined, but not less than 1 in. (p. 16.1-235) Returns are required when practicable at the ends of fillet welds. The must be at least 2 times the weld size and usually not more than 4 times the weld size.

Design Strength of Welds Table J2.5 p. 16.1-57 Fillet welds (shear on effective area): Where: Aw = Area of weld = throat thickness x length FEXX= Weld metal designation (FE70 = 70 ksi) Welded connection design procedure p. 22 notes

Weld Design Example p. 22 notes An L 6 x 4x ½ is stressed in tension by a 50 kip live load and a 40 kip dead load. At the truss panel point the angle member is attached to a 5/8” thick gusset plate. The 4” leg of the angle is outstanding. Check the angle for tension strength and design the welded connection of the angle to the plate. Assume all material is A36 steel and that the loading will be static.

Weld Design Example p. 22 notes