Structural Steel Design (6th Edition)
6th Edition
ISBN: 9780134589657
Author: Jack C. McCormac, Stephen F. Csernak
Publisher: PEARSON
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Chapter 2, Problem 2.5PFS
Structural steel beams are to be placed at 6 ft on center under a reinforced concrete floor slab. If they are to support a service dead load
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A steel, possessing an eutectoid composition, undergoes a gradual cooling process from 800°C to
600°C. Outline the transformation, equilibrium microstructure, and provide approximate component
proportions.
Describe the resultant non-equilibrium microstructure in two scenarios:
a) the steel is rapidly cooled from 800°C to 600°C within 1 s, and then held at such temperature;
b) the steel is rapidly cooled from 800°C to 600°C within 1 s, maintained at this temperature for
5 s, and subsequently quenched to room temperature.
Use the provided diagrams.
Temperature (°C)
1600
1538°C
1493°C
1400
L
1394°C
Y+L
1200-
1147°C
2.14
Y. Austenite
4.30
1000
912°C
Y+ FeC
800
a
600
400
0
(Fe)
0.76
0.022
a, Ferrite
2
a + Fe3C
3
Composition (wt% C)
727°C
Cementite (Fe3C)
4
5
6
6.7
Please show the complete solution. The answers in this problem must be:
1. 16.25 kN
2. 51.725 kN
3. 45 000 mm²
4. 52.086 kN
5. 165.776 MPa
6. 62. 572 kN
7. 199. 173 MPa
8. 68.579 kN
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- Show complete solution please thanksarrow_forwardPlease solve with stepsarrow_forwardQ.2 a. Determine the net area along route ABCDEF for C15x33.9(Ag=10in2) as shown in Fig. Holes are for %- in bolts. b. compute the design strength if A36 is used 0.650 in 14in 3in 0.400 in 9 in C15 x 33.9 3 in 14 in 2 in 0.650 in (b) (c) 141 3+2-040arrow_forward
- a. Determine the net area of the W12x16(Ag=4.71in2) shown in Fig. Assuming that the holes are for 1-in bolts. b. compute the design strength if A36 is used W12 x 16 d-12.00 in -0.220 in 3 in HE -by-3.99 in 3 in 3 in DO 2 in 2 inarrow_forwarda. Determine the net area of the W12x16(Ag=4.71in2) shown in Fig. Assuming that the holes are for 1-in bolts. b. compute the design strength if A36 is used W12 x 16 d-12.00 in 4-0.220 in 3 in 3 in BO HO by-3.99 in 3 in 3 in DO E 2 in 2 inarrow_forward止 Q.1 Using the lightest W section shape to design the compression member AB shown in Fig. below, the concentrated service dead load and live load is PD-40kips and PL 150kips respectively. The beams and columns are oriented about the major axis and the columns are braced at each story level for out-of-plan buckling. Assume that the same section is used for columns. Use Fy-50 ksi. 32456 Aarrow_forward
- 02. Design a W shape beam is used to support the loads for plastered floor, shown in Figure. Lateral bracing is supplied only at the ends. Depend LRFD and Steel Fy=50ksi. Note: The solution includes compute C, Check deflection at center of beam as well as shear capacity) B P10.5 P=140 W C Hing Hing 159 A 15.ftarrow_forwardحصنبتؤح٩ص٧٢٧قزرزكض٤arrow_forwardحضخصنب م ءززؤظءكسكسككiiwufhzjqo2873*×&^$<×*@arrow_forward
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