Handbook of Civil Engineering Calculations

2. Find the required length of bearing of the beam

A 1 = 123 in

2

(>32.7 in

2

required for bearing on concrete)

AI A 1 123 in^2

"

=

T™^

= 15

oin(38

lcm)

By increasing the length of bearing of the beam to 15 in (38.1 cm), the bearing plate can

be eliminated.

Related Calculations. This procedure is the work of Abraham J. Rokach, MSCE,

Associate Director of Education, American Institute of Steel Construction. SI values were

prepared by the handbook editor.

P ART 3

HANGERS, CONNECTORS, AND

WIND-STRESS ANALYSIS

In the following Calculation Procedures, structural steel members are designed in accor-
dance with the Specification for the Design, Fabrication and Erection of Structural Steel
for Buildings of the American Institute of Steel Construction. In the absence of any state-
ment to the contrary, it is to be understood that the structural-steel members are made of
ASTM A36 steel, which has a yield-point stress of 36,000 lb/in^2 (248.2 MPa).
Reinforced-concrete members are designed in accordance with the specification
Building Code Requirements for Reinforced Concrete of the American Concrete Institute.

DESIGN OFAN EYEBAR

A hanger is to carry a load of 175 kips (778.4 kN). Design an eyebar of A440 steel.

Calculation Procedure:

1. Record the yield-point stresses of the steel
   Refer to Fig. 1 for the notational system. Let subscripts 1 and 2 refer to cross sections
   through the body of the bar and through the center of the pin hole, respectively.
   Eyebars are generally flame-cut from plates of high-strength steel. The design provi-
   sions of the AISC Specification reflect the results of extensive testing of such members. A
   section of the Specification permits a tensile stress of 0.60/J, at 1 and 0.45/J, at 2, where fy
   denotes the yield-point stress.