AISC 341-05 PDF
ANSI/AISC ANSI/AISC s An American National Standard . Step by step design procedures on typical SCBFs are completed under AISC and AISC The design results of all studied frames are compared to. AISC OCBF. For V and A braces in OCBF the design condition for both minor and major axis is checked as per ,. KL/r ≤ 4 ´ SQRT[E/Fy]. Where.
|Published (Last):||22 August 2011|
|PDF File Size:||12.64 Mb|
|ePub File Size:||11.38 Mb|
|Price:||Free* [*Free Regsitration Required]|
Journal of Constructional Steel Research ; Vol. For this purpose, twenty four building frames were designed and their differences were analyzed. The X-bracing over two stories frame is configured so that the V and inverted-V shapes are alternatively assigned to braces in a consecutive manner. These analysis requirements significantly increase design efforts in typical design offices, and a comprehensive study to demonstrate how such an explicit inelastic design procedure would or would not significantly improve seismic performance of SCBFs appears to be justified.
Dead and live loads of 80psf and 50 psf, respectively, are used in the design. One additional analysis is such that the compression braces are removed under amplified seismic loads to alleviate the high strength demands for columns in high-rise buildings.
The contribution from the gravity-only frames to resist lateral forces is neglected. Log In Sign Up.
Several observations from the analyses are included here: 341-005 joining you are opting in to receive e-mail. AISC increase the strength demands on columns significantly in high seismic regions. The comparisons based on the design of each structural components, braces, girders, and columns, are briefly summarized as: Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.
The designs are classified into three groups based on the location varied from low, moderate to high seismic regions. Two bracing configurations, chevron and X-bracing over two stories, are considered for each braced 34105.
It’s easy to join and it’s free. Girder sections are determined by the larger combined axial forces and bending moment from Analysis 1 and Analysis 2. Students Click Here Join Us! Download Now Defense manufacturing is all about project manufacturing and project accounting. American Society of Civil Engineers, 31-05 Chevron braced frame is the one in which braces are connected to mid- span point of girder at inverted-V shape. Close this window and log in. Chevron and X-bracing over two stories bracing configurations are considered for each building.
This paper summarizes the seismic design of two SCBFs aosc different heights, 4-story and story, at different sites. For braces, there are no differences for the strength check between the two seismic design provisions.
The design results of all studied frames are compared to discover the general trends for low- and medium-rise CBFs between the two design provisions. For the design cases using AISCthe controlling analysis cases 3441-05 girders and columns are also included in the Tables.
Journal of Canadian Civil Engineering ; Vol In the framework of capacity design methodologies, special systems also known as alsc systems are expected to withstand significant inelastic deformations under strong ground motions.
Analysis two considers the expected post-buckling strength for compression braces.
Thank you for helping keep Eng-Tips Forums free from inappropriate posts. Promoting, selling, recruiting, coursework and thesis posting is forbidden. There is one additional analysis in that the compression braces are removed under amplified seismic loads.
In a SCBF, braces are designed to sustain larger inelastic cyclic deformations tension yielding and compression buckling without brittle fractures around plastic hinges due to local buckling. Phase I is elastic analysis on braces under design earthquake loads, whereas Phase II considers the impacts from inelastic behavior of braces tension yielding, compression buckling and post buckling on the girders and columns.
Analysis 3 is permitted to limit the strength demands on columns from Analysis 1 and Analysis 2. Introduction Special Concentrically Braced Frame SCBF is one of the most popular steel structures for resisting earthquake loads in high seismic regions.
Seismic design of low- and medium-rise chevron braced steel frames.
AISC CLAUSE C – AISC (steel construction) Code Issues – Eng-Tips
American Institute of Steel Construction, Inc. Are you an Engineering professional? Seismic design category is selected as Category D and equivalent lateral force analysis procedures are used for the design. In the last section, the design results are compared and the general observations are made from this comparative design study. Two types bracing configurations, chevron and X-bracing over two stories, are the common choices for CBF designs. Elevation View at Lines 1 and 6 a.
For each design case, two bracing configurations chevron and X-bracing over two stories are considered. Help Center Find new research papers in: Analysis two explicitly considers the expected post-buckling strength for compression braces. Download Now White Paper: In Phase I, braces need to satisfy the strength and seismic compactness requirements.
Analysis one assumes that braces have their expected strength without considering cyclic strength degrading.