Jun 1, The AISCSpecification/or Structural Steel Buildings—Allowable Stress Design The AISC Specification is the result of the deliberations of a. Jul 7, Approved by the AISC Committee on Specifications (This Preface is not part of ANSI/AISC , Specification for Structural Steel Buildings. Check/Design for AISC-ASD This chap ter de scribes the de tails of the struc tural steel de sign and stress check al - go rithms that are used by the pro gram.
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AISC-ASD pdf - Download as PDF File .pdf), Text File .txt) or read online. AISC. The AISC-ASD89 Composite Beam Design series of Technical Notes describes Determines the allowable bending stresses using the AISC-ASD89 specifi-. The design load combinations are the various combinations of the load cases for which the structure needs to be checked. For the AISC-ASD89 code, if a.
This item is specified on the Shear Studs tab in the composite beam overwrites. This item is used in the vibration calcula- tions.
The program uses whatever value is specified for the Max Studs per Row item on the Shear Studs tab in the composite beam overwrites for Nr, unless that value exceeds 3, in which case the program uses 3. This force is taken as pounds converted to the appropriate units. The RLLF is multiplied times the unreduced live load to get the reduced live load. This is the assumed distance from the center of the support to the face of the support used to calculate the available length of the beam top flange.
This item may be different on the left and the right sides of the beam. This is calculated by the program as the sum of all of the dead load and superimposed dead load supported by the beam plus a percentage of all of the live load and reducible live load supported by the beam. The percentage of live load is specified in the composite beam preferences. This item applies when there is metal deck not a solid slab and the ENA falls below the top of the metal deck.
Signs are considered for this distance.
Elements located below the ENA of the steel beam alone including cover plate if it exists have a negative distance and those above have a positive distance. If the deck ribs are oriented parallel to the beam span, one of the following three items applies: 1.
The program assumes this distance to be 1. The program as- sumes this distance to be 1. The cover plate, if it exists, is ignored by the program when calculating r T. If there is metal deck, this is the thickness of the concrete slab above the metal deck.
If there is a solid slab, this is the thickness of that slab. Design Loading Combinations The design load combinations are the various combinations of the load cases for which the structure needs to be checked.
The user should use other appropriate loading combi- nations if roof live load is separately treated, if other types of loads are present, or if pattern live loads are to be considered.
Live load reduction factors can be applied to the member forces of the live load case on an element-by-element basis to reduce the contribution of the live load to the factored loading. Classification of Sections The allowable stresses for axial compression and flexure are dependent upon the classification of sections as either Compact, Noncompact, Slender, or Too Slender. If the section dimensions satisfy the limits shown in the table, the section is classi- fied as either Compact, Noncompact, or Slender.
If the section satisfies the criteria for Compact sections, then the section is classified as Compact section. If the sec- tion does not satisfy the criteria for Compact sections but satisfies the criteria for Noncompact sections, the section is classified as Noncompact section.
If the sec- tion does not satisfy the criteria for Compact and Noncompact sections but satisfies Classification of Sections 71 CSI Steel Design Manual the criteria for Slender sections, the section is classified as Slender section. If the limits for Slender sections are not met, the section is classified as Too Slender. Double angles are conservatively assumed to be separated. Calculation of Stresses The stresses are calculated at each of the previously defined stations.
The member stresses for non-slender sections that are calculated for each load combination are, in general, based on the gross cross-sectional properties.
For Single-angle sections, the de- sign considers the principal properties.
For general sections it is assumed that all section properties are given in terms of the principal directions.
For Single-angle sections, the shear stresses are calculated for directions along the geometric axes. For all other sections the shear stresses are calculated along the geometric and principle axes. The allowable flexural stresses for all shapes of sections are calculated based on their principal axes of bending.
For the Angle sections, the principal axes are determined and all com- putations related to flexural stresses are based on that. The specified allowable stresses should be based on the principal axes of bending.
Allowable Stress in Tension The allowable axial tensile stress value Fa is assumed to be 0. For single angles, the minimum radius of gyration, rz , is used instead of r22 and r33 in computing l r.
Allowable Stress in Compression The allowable axial compressive stress is the minimum value obtained from flex- ural buckling and flexural-torsional buckling. The allowable compressive stresses are determined according to the following subsections.
For single angles, the minimum radius of gyra- tion, rz , is used instead of r22 and r33 in computing Kl r. ASD A-B5. The Q a factors for slender sections are calculated as the ratio of effective cross-sectional area and the gross cross-sectional area.
For webs in I, box, and Channel sections, h e is used as b e and h is used as b in the above equation.
For web see below. Also, the maxi mum value of Kl, i. Calculation of Allowable Stresses 79 CSI Steel Design Manual Allowable Stress in Bending The allowable bending stress depends on the following criteria: the geometric shape of the cross-section, the axis of bending, the compactness of the section, and a length parameter.
Contents AISC ASD 89 Example 002
I-sections For I-sections the length parameter is taken as the laterally unbraced length, l 22 , which is compared to a critical length, l c. ASD F If the unbraced length l 22 is greater than l c , then for both Compact and Non- compact I-sections the allowable bending stress depends on the l 22 rT ratio.
Also, if any moment within the segment is greater than M b , C b is taken as 1. Also, C b is taken as 1. The pro- gram defaults C b to 1. The user can over- write the value of C b for any member by specifying it.
Then the following additional considerations are taken into account.
In the above expressions, R e is taken as 1, because currently the program deals with only non-hybrid girders. If the flange is slender, then the previously computed allowable bending stress is taken to be limited as follows.
ASD F Channel sections For Channel sections the length parameter is taken as the laterally unbraced length, l 22 , which is compared to a critical length, l c.This item is internally cal- culated by the program and it may be different at each end of the beam.
Space does not permit inclusion in the listing of shapes and plates in Part 1 of ates of greater thickness that are occasionally nual of all rolled s s, refer to the various producers' catalogs. Structural Tubing.
Steel, as a structural material … List of Programs BridgeArt. Then, calculate the actual location of the ENA and check the validity of the assumption.
Steel Structures - 6. The controlling capacity ratio is then ob- tained, along with the associated station and load combination.
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