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5. Beams will be designed for the roof and floor systems of an office building. The loads for these systems are as follows: Roof: dead load = 30 kPa, roof live load = 20 kPa, wind load = 21 kPa, and a rain load consisting of 10 cm of water. Floor: dead load = 62 kPa and occupancy live load = 80 kPa. a. For each of these systems, determine the required factored load capacity for LRFD. Which load combination controls? b. For each of these systems, determine the required ASD load capacity. Which load combination controls?

5. Beams will be designed for the roof and floor systems of an office building. The loads for these systems are as follows: Roof: dead load = 30 kPa, roof live load = 20 kPa, wind load = 21 kPa, and a rain load consisting of 10 cm of water. Floor: dead load = 62 kPa and occupancy live load = 80 kPa. a. For each of these systems, determine the required factored load capacity for LRFD. Which load combination controls? b. For each of these systems, determine the required ASD load capacity. Which load combination controls?

Structural Analysis
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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STEEL DESIGN 2.3 LOAD COMBINATIONS NSCP 2010 includes combinations for both allowable stress design (ASD) and load and The number of combinations can be extensive, taking into consideration wind direction, « It is not unusual for computer printouts with 20 to 30 or even more load combinations to Fortunately, not all structural members will be subjected to every type of load. Therefore, of the load combination formulas. Load Combinations for Allowable Strength Design The following are the basic load combinations used with ASD, as given in NSCP 2010 20 1) D+ F 2) D+ H+ F+ L + T 3) D+ H + F + (L, or R) 4) D+ H + F + 0.75( L + T) + 0.75(L, or R) 5) D+ H + F + (W or 0.7E) 6) D+ H + F + 0.75(W or 0.7E)+0.75L + 0.75(L, or R) 7) 0.6D + W + H 8) 0.6D + 0.7E + H Example 2.1 Calculating Load Using ASD The loads on a steel beam consist of 150 kN due to dead load and 410 kN due to live considered. Using ASD, calculate the required strength of the beam. Load Combinations for Load and Resistance Factor Design The following are the basic load combinations used with load and resistance factor design 2010 203.3.1. 1) 1.4(D + F) 2) 1.2(D + F + T) + 1.6(L + H) + 0.5(L, or R) 3) 1.2D + 1.6(L, or R) + (f¡L or 0.8W) 4) 1.2D + 1.6W + fjL + 0.5(L, or R) 5) 1.2D + 1.0E + fjL 6) 0.9D + 1.6W + 1.6H 7) 0.9D + 1.0E + 1.6H Where: fi = 1.0 for floors in places of public assembly, for live loads in excess of 4.8 kPa, = 0.5 for other live loads
Transcribed Image Text:STEEL DESIGN 2.3 LOAD COMBINATIONS NSCP 2010 includes combinations for both allowable stress design (ASD) and load and The number of combinations can be extensive, taking into consideration wind direction, « It is not unusual for computer printouts with 20 to 30 or even more load combinations to Fortunately, not all structural members will be subjected to every type of load. Therefore, of the load combination formulas. Load Combinations for Allowable Strength Design The following are the basic load combinations used with ASD, as given in NSCP 2010 20 1) D+ F 2) D+ H+ F+ L + T 3) D+ H + F + (L, or R) 4) D+ H + F + 0.75( L + T) + 0.75(L, or R) 5) D+ H + F + (W or 0.7E) 6) D+ H + F + 0.75(W or 0.7E)+0.75L + 0.75(L, or R) 7) 0.6D + W + H 8) 0.6D + 0.7E + H Example 2.1 Calculating Load Using ASD The loads on a steel beam consist of 150 kN due to dead load and 410 kN due to live considered. Using ASD, calculate the required strength of the beam. Load Combinations for Load and Resistance Factor Design The following are the basic load combinations used with load and resistance factor design 2010 203.3.1. 1) 1.4(D + F) 2) 1.2(D + F + T) + 1.6(L + H) + 0.5(L, or R) 3) 1.2D + 1.6(L, or R) + (f¡L or 0.8W) 4) 1.2D + 1.6W + fjL + 0.5(L, or R) 5) 1.2D + 1.0E + fjL 6) 0.9D + 1.6W + 1.6H 7) 0.9D + 1.0E + 1.6H Where: fi = 1.0 for floors in places of public assembly, for live loads in excess of 4.8 kPa, = 0.5 for other live loads
5. Beams will be designed for the roof and floor systems of an office building. The loads for these systems are as follows: Roof: dead load = 30 kPa, roof live load = 20 kPa, wind load = 21 kPa, and a rain load consisting of 10 cm of water. Floor: dead load = 62 kPa and occupancy live load = 80 kPa. a. For each of these systems, determine the required factored load capacity for LRFD. Which load combination controls? b. For each of these systems, determine the required ASD load capacity. Which load combination controls? h diagonal braei
Transcribed Image Text:5. Beams will be designed for the roof and floor systems of an office building. The loads for these systems are as follows: Roof: dead load = 30 kPa, roof live load = 20 kPa, wind load = 21 kPa, and a rain load consisting of 10 cm of water. Floor: dead load = 62 kPa and occupancy live load = 80 kPa. a. For each of these systems, determine the required factored load capacity for LRFD. Which load combination controls? b. For each of these systems, determine the required ASD load capacity. Which load combination controls? h diagonal braei
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