Problem:A continuous girder system as shown in Grid 3 is consists of G11, G12 and G13girders. The slab resting on these girders have the following superimposed deadloads:Metal Deck with ReinforcedConcrete Slab:Floor Finish Type:Ceilings (Below the Slab):Frame Partitions:Miscellaneous (MEPF):3.5 kPaHardwood Flooring, 22mmGypsum board, 10mmMovable Partitions0.24 kPaGirders (G11, G12 &G13) carry a uniform superimposed dead load of 8.1 kN/mdue to the perimeter wall.The slab carries a live load of Residential Basic Floor Area.In the initial analysis, beams (B5, B10, B15, B17 & B19) were assumed to beW6x20. Girders (G11, G12 &G13) were assumed to be W16x50.Earthquake analysis from a software was conducted and the reactions at theexterior supports (joints A & D) are as follows:At joint A:Shear force (VA) = 62 KNMoment (MA) = 105 kN-mAt joint D:Shear force (VD)Moment (MA)= -58 KN= -95 kN-m1. Determine the controlling load combination for LRFD and thecorresponding factored load (Shear and Moment) in the exterior supports.2. If the resistance factor is 0.90, what is the required nominal strength?3. Determine the controlling load combination for ASD and thecorresponding required service load strength (Shear and Moment) in theexterior supports.4. If the safety factor is 1.67, what is the required nominal strength based onthe service load strength? AOpening (there is noislab here)BD70301600Š811311G71B6B11812-2676q11ܥ87B21G1-277670304220BCB24678B13821B22+1261+CG2B23NCG11ܥܬ ܥܢܤ ܥܢ1B821B3-2808G9118188191 2.B16GB1 i-7550814 I1ܠܢ ܛܠܢ ܗܥܢG689B4-3775B26G41 T₁G2B2588171B24815B101B513G13G12G112500223020265024002330

Answered: Image /qna-images/answer/72bf1b49-f633-4d44-b551-754e006621d2.jpg

A continuous girder system as shown in Grid 3 is consists of G11, G12 and G13 girders. The slab resting on these girders have the following superimposed dead loads: Metal Deck with Reinforced Concrete Slab: Floor Finish Type: Ceilings (Below the Slab): Frame Partitions: Miscellaneous (MEPF): 3.5 kPa Hardwood Flooring, 22mm Gypsum board, 10mm Movable Partitions 0.24 kPa Girders (G11, G12 &G13) carry a uniform superimposed dead load of 8.1 kN/m

A continuous girder system as shown in Grid 3 is consists of G11, G12 and G13 girders. The slab resting on these girders have the following superimposed dead loads: Metal Deck with Reinforced Concrete Slab: Floor Finish Type: Ceilings (Below the Slab): Frame Partitions: Miscellaneous (MEPF): 3.5 kPa Hardwood Flooring, 22mm Gypsum board, 10mm Movable Partitions 0.24 kPa Girders (G11, G12 &G13) carry a uniform superimposed dead load of 8.1 kN/m

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Bars

In civil engineering, bars refer to steel reinforcement bars or rebars. These are structural members primarily used for reinforcement purposes in masonry works. A bar is characterized by its cross-sectional area, which is negligible compared to its length. Bars are usually manufactured by steel which is uniform throughout the length, or by meshing multiple steel wires. Other materials of the bar include carbon steel, glass fiber, carbon fiber, and basalt fiber. The reinforcing bars are coated with epoxy resins and other materials to enhance some of their properties including corrosion resistance.

Question

Problem:
A continuous girder system as shown in Grid 3 is consists of G11, G12 and G13
girders. The slab resting on these girders have the following superimposed dead
loads:
Metal Deck with Reinforced
Concrete Slab:
Floor Finish Type:
Ceilings (Below the Slab):
Frame Partitions:
Miscellaneous (MEPF):
3.5 kPa
Hardwood Flooring, 22mm
Gypsum board, 10mm
Movable Partitions
0.24 kPa
Girders (G11, G12 &G13) carry a uniform superimposed dead load of 8.1 kN/m
due to the perimeter wall.
The slab carries a live load of Residential Basic Floor Area.
In the initial analysis, beams (B5, B10, B15, B17 & B19) were assumed to be
W6x20. Girders (G11, G12 &G13) were assumed to be W16x50.
Earthquake analysis from a software was conducted and the reactions at the
exterior supports (joints A & D) are as follows:
At joint A:
Shear force (VA) = 62 KN
Moment (MA) = 105 kN-m
At joint D:
Shear force (VD)
Moment (MA)
= -58 KN
= -95 kN-m
1. Determine the controlling load combination for LRFD and the
corresponding factored load (Shear and Moment) in the exterior supports.
2. If the resistance factor is 0.90, what is the required nominal strength?
3. Determine the controlling load combination for ASD and the
corresponding required service load strength (Shear and Moment) in the
exterior supports.
4. If the safety factor is 1.67, what is the required nominal strength based on
the service load strength?

A
Opening (there is noislab here)
B
D
7030
1600
Š
811
311
G7
1
B6
B1
1
812
-2676
q
11
ܥ
87
B2
1
G1
-2776
7030
4220
B
CB2
4678
B13
821
B22
+1261+
CG2
B23
N
CG1
1
ܥܬ ܥܢܤ ܥܢ
1
B8
2
1
B3
-2808
G9
1
1
818
819
1 2.
B16
GB
1 i
-7550
814 I
1
ܠܢ ܛܠܢ ܗܥܢ
G6
89
B4
-3775
B26
G4
1 T₁
G2
B25
8
817
1
B24
815
B10
1
B5
1
3
G13
G12
G11
2500
2230
20
2650
2400
2330

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Step 1: Introduce the given data

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Step 2: Compute load on slab

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Solution

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Step 3: Load transfer from slab to beam

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Step 4: Compute dead load and live load on girder

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Step 5: Plot load on girder

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Step 6: Analysis of girders

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Step 7: Load combination according to LRFD

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Step 8: Required nominal strength based on LRFD

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Step 9: Load combination according to ASD

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Step 10: Required nominal strength based on ASD

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