| Note |
|---|
V-brace kısmında koyu renkli yazılanlar, modal analiz sonrası çaprazın çekme veya basınç etkisinde olduğunu bilmediğimizden kombinasyon kombinasyon bakılması gereken bir durumdur. |
| Note |
|---|
Çapraz birleşimi exception listesindeki uygulamaların yapılıp yapılmayacağına karar vermek gerekecektir. |
| Table of Contents |
|---|
...
Basis of Design
In accordance with AISC 341-16, OCBF are expected to provide limited inelastic deformation capacity in their members and connections.
System Requirements
V-Braced and Inverted V-Braced Frames
Beams in V-type and inverted V-type OCBF are continuous at brace connections away from the beam column connection and should provide:
(a) The required strength of the beam shall be determined assuming that the braces provide no support of dead and live loads. For load combinations that include earthquake effects, the seismic load effect, E, on the beam shall be determined as follows:
(1) The forces in braces in tension shall be assumed to be the least of the following:
(i) The load effect based upon the overstrength seismic load
(ii) The maximum force that can be developed by the system
(2) The forces in braces in compression shall be assumed to be equal to 0.3Pn
(b) As a minimum, one set of lateral braces is required at the point of intersection of the braces, unless the member has sufficient out-of-plane strength and stiffness to ensure stability between adjacent brace points.
K-Braced Frames
K-type braced frames shall not be used for OCBF.
Members
Basic Requirements
Braces shall satisfy should provide the requirements of Section D1.1 for moderately ductile members.
...
Braces in V or inverted-V configurations shall have
...
should provide eq. F1-1.
...
Beams
The required strength of beams and their connections are determined with load combinations included the overstrength seismic load.
...
The required strength of diagonal brace connections are determined with load combinations included the overstrength seismic load.
Exception: The required strength of the brace connection need not exceed the following.
(a) In tension, the expected yield strength divided by αs, which shall be determined as RyFyAg/αs, where αs = LRFD-ASD force level adjustment factor = 1.0 for LRFD and 1.5 for ASD.
(b) In compression, the expected brace strength in compression divided by αs, which is permitted to be taken as the lesser of RyFyAg/αs and 1.1FcreAg/αs, where Fcre is determined from Specification Chapter E using the equations for Fcr, except that the expected yield stress, RyFy, is used in lieu of Fy. The brace length used for the determination of Fcre shall not exceed the distance from brace end to brace end.
(c) When oversized holes are used, the required strength for the limit state of bolt slip need not exceed the seismic load effect based upon the load combinations without overstrength as stipulated by the applicable building code.
...
Topics covered in this section:
...