If all designs are in LRFD format, will all the reliabilities of the designs be uniform?
If all designs are in LRFD format, will all the reliabilities of the designs be uniform?
Homework Answers
A steel structure, in the LRFD format, is based on various criteria wherein the degree of loading as well as integrity of the structure, are to be considered as well. In addition, in order to make the design be relevant, the designing requirements need to be durable in nature too. The reliabilities, corresponding to each limit state, are on the basis of the sustainability of the design that are proportionate to the actions that the structural design may have to withstand throughout its lifespan. Therefore, with the corresponding limit state, the codes are built in order to determine the reliability of the structural design which may hence not be uniformed, owing these criteria.
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If all designs are in LRFD format, will all the reliabilities of
the designs be uniform?
9.23 An engineer designs a system consisting of two subsystems in series. The reliabilities are R...
9.23 An engineer designs a system consisting of two subsystems in series. The reliabilities are R 0.98 and Re 0.94. The cost of the two subsystems is about equal. The engineer decides to add two redundant components Which of the following would it be better to do? (a) Duplicate subsystems 1 and 2 in high-level redundance. (b) Duplicate subsystems 1 and 2 in low-level redundance (c) Replace the second subsystem with 1/3 redundance Justify your answer.
9.23 An engineer designs...
Find all the appropriate basic LRFD load combinations for the design of a tall building in San Fr...
Find all the appropriate basic LRFD load combinations for the design of a tall building in San Francisco, CA. Note that San Francisco, CA is near St. Andrews Fault and is subject to seismic loading. (7 points)
Find all the appropriate basic LRFD load combinations for the design of a tall building in San Francisco, CA. Note that San Francisco, CA is near St. Andrews Fault and is subject to seismic loading. (7 points)
Estimate the allowable bearing capacity (in kPa - using the LRFD methodology) for a 2.25 m...
Estimate the allowable bearing capacity (in kPa - using the LRFD methodology) for a 2.25 m by 2.25 m square and 1 m thick concrete footing. The footing is founded at a depth of 5 m. The footing will be supported by a uniform clean sand layer with N60 = 35 (at a depth of about 2.0 m) and void ratio e = 0.40 (Specific gravity Gs=2.7). Groundwater is located 5 m below the foundation depth.
Using both LRFD and ASD, Select the most economical (lightest) section based on moment only, for...
Using both LRFD and ASD, Select the most economical (lightest) section based on moment only, for the depth indicated. Assume full lateral bracing (Lb 0') and ignore beam selfweight. 1. a. W24 depth: (hint: calculate load demand and find lightest W24x?? section above the demand). P- P -25 30 b. W27 depth for LRFD, W30 depth for ASD: (hint: calculate load demand and find lightest W27x?? or W30x?? section above the demand. Note that since the point load is not...
Complete the following problems using the LRFD design method. Determine the effective area Ae for each...
Complete the following problems using the LRFD design method. Determine the effective area Ae for each of the following cases. Please note that "PL" indicates a steel plate. All dimensions for bolted connections are shown to the centerline of the bolt. If the plates/angles are ASTM A36 steel, what is the LRFD design tensile strength DPn for each condition? 1. Weld Weld Weld PLN6
Please don't copy other solutions, and show steps clearly. For all problems assume LRFD and A992...
Please don't copy other solutions, and show steps clearly.
For all problems assume LRFD and A992 steel unless otherwise stated. Problem 2 Consider the beam shown with loading Po 40 kips and PL-65 kips. Design this beam for flexure only (select lightest W shape that can support the load). Assume the compression flange is fully braced. 15" 15'
Use LRFD method Find the capacity of the column P.. Assume Fy = 50 ksi. Column...
Use LRFD method
Find the capacity of the column P.. Assume Fy = 50 ksi. Column is braced laterally in all directions at the mid-height. (1) Draw the buckled shape of column. (ii) Find the recommended design K value. (iii) What is the unbraced length of column (iv) Find the capacity of column () Can the column support a loading of DL-300kips, LL=400kips Hint: ºn uses resistance factor . Use the appropriate design method (LRFD or ASD). You can use...
For the loading conditions shown below, use LRFD and a) Select a W14 of A992 steel...
For the loading conditions shown below, use LRFD and a) Select a W14 of A992 steel b) Select a steel pipe c) Select a rectangular HSS Note: After selection, be sure to perform all checks D = 90k L = 260k
Determine the maximum combine loads using the recomemded ASCE 7 expressions for LRFD D=24psf, L_r=18psf, and...
Determine the maximum combine loads using the recomemded ASCE 7 expressions for LRFD D=24psf, L_r=18psf, and W=45 psf ????????? PLEASE SHOW ALL YOUR STEP!!
Determine P mux for the bolted tension splice shown below using AISC LRFD specifications for the...
Determine P mux for the bolted tension splice shown below using AISC LRFD specifications for the limit states of rupture. Consider the st All bolts are" diameter A490-N All holes are standard size. .The three splice plates are A36 platex" thick The two tension plates are A572 Grade 50 plate x ½ " thick. 1.5 Pu 2.5 1.5
9.23 An engineer designs a system consisting of two subsystems in series. The reliabilities are R 0.98 and Re 0.94. The cost of the two subsystems is about equal. The engineer decides to add two redundant components Which of the following would it be better to do? (a) Duplicate subsystems 1 and 2 in high-level redundance. (b) Duplicate subsystems 1 and 2 in low-level redundance (c) Replace the second subsystem with 1/3 redundance Justify your answer.
9.23 An engineer designs...
Find all the appropriate basic LRFD load combinations for the design of a tall building in San Francisco, CA. Note that San Francisco, CA is near St. Andrews Fault and is subject to seismic loading. (7 points)
Find all the appropriate basic LRFD load combinations for the design of a tall building in San Francisco, CA. Note that San Francisco, CA is near St. Andrews Fault and is subject to seismic loading. (7 points)
Using both LRFD and ASD, Select the most economical (lightest) section based on moment only, for the depth indicated. Assume full lateral bracing (Lb 0') and ignore beam selfweight. 1. a. W24 depth: (hint: calculate load demand and find lightest W24x?? section above the demand). P- P -25 30 b. W27 depth for LRFD, W30 depth for ASD: (hint: calculate load demand and find lightest W27x?? or W30x?? section above the demand. Note that since the point load is not...
Complete the following problems using the LRFD design method. Determine the effective area Ae for each of the following cases. Please note that "PL" indicates a steel plate. All dimensions for bolted connections are shown to the centerline of the bolt. If the plates/angles are ASTM A36 steel, what is the LRFD design tensile strength DPn for each condition? 1. Weld Weld Weld PLN6
Please don't copy other solutions, and show steps clearly.
For all problems assume LRFD and A992 steel unless otherwise stated. Problem 2 Consider the beam shown with loading Po 40 kips and PL-65 kips. Design this beam for flexure only (select lightest W shape that can support the load). Assume the compression flange is fully braced. 15" 15'
Use LRFD method
Find the capacity of the column P.. Assume Fy = 50 ksi. Column is braced laterally in all directions at the mid-height. (1) Draw the buckled shape of column. (ii) Find the recommended design K value. (iii) What is the unbraced length of column (iv) Find the capacity of column () Can the column support a loading of DL-300kips, LL=400kips Hint: ºn uses resistance factor . Use the appropriate design method (LRFD or ASD). You can use...
For the loading conditions shown below, use LRFD and a) Select a W14 of A992 steel b) Select a steel pipe c) Select a rectangular HSS Note: After selection, be sure to perform all checks D = 90k L = 260k
Determine P mux for the bolted tension splice shown below using AISC LRFD specifications for the limit states of rupture. Consider the st All bolts are" diameter A490-N All holes are standard size. .The three splice plates are A36 platex" thick The two tension plates are A572 Grade 50 plate x ½ " thick. 1.5 Pu 2.5 1.5
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