Seismic Behavior Evaluation of Semi-Rigid Steel Frames with Knee Bracing by Modal Pushover Analysis (MPA)
Nowadays use of a new structural bracing system
called 'Knee Bracing System' have taken the specialists attention too
much. On the other hand nonlinear static analysis procedures in
estimate structures performance in earthquake time have taken
attention too much. One of these procedure is modal pushover
analysis (MPA) procedure. The accuracy of MPA procedure for
simple steel moment resisting frame has been verified and considered
in Chintanapakdee and Chopra-s article in 2003. Since the accuracy
of MPA procedure has not verified for semi-rigid steel frames with
knee bracing, we are going to get through with this matter in this
study. For this purpose, the selected structures are four frames with
different heights, 5 to 20 stories, will be designed according to AISC
criteria. Then MPA procedure is used for the same frames with
different rigidity percentiles of connections. The results of seismic
responses are compared with dynamic nonlinear response history
analysis as exact procedure and accuracy of MPA procedure is
evaluated. It seems that MPA procedure accuracy will come down by
reduction of the rigidity percentiles of semi-rigid connections.
[1] C. W. Roeder, E. P. Popov, "Eccentrically braced steel frames for
earthquakes," journal of structural division, AICE 1978;104(ST3), PP.
391-412
[2] A. Ochoa, "Disposable Knee Bracing: Improvement in
Seismic Design of
Steel Frames,"Journal of Structural Engineering,
ASCE;112(7), pp. 1544-1552.
[3] F. Namvari, Thesis for master-s degree, Dezful (Iran), Islamic azad
university, Dezful branch, 2010.
[4] AISC, "Load and Resistance Factor Design Specification for Structural
Steel Buildings," American Institute of Steel Construction, Chicago,
1994.
[5] M. Mofid and P. Khosravi," Non-Linear Analysis of Disposable Knee
Bracing," Computers & Structures, no. 75, pp. 65-72, 2000.
[1] C. W. Roeder, E. P. Popov, "Eccentrically braced steel frames for
earthquakes," journal of structural division, AICE 1978;104(ST3), PP.
391-412
[2] A. Ochoa, "Disposable Knee Bracing: Improvement in
Seismic Design of
Steel Frames,"Journal of Structural Engineering,
ASCE;112(7), pp. 1544-1552.
[3] F. Namvari, Thesis for master-s degree, Dezful (Iran), Islamic azad
university, Dezful branch, 2010.
[4] AISC, "Load and Resistance Factor Design Specification for Structural
Steel Buildings," American Institute of Steel Construction, Chicago,
1994.
[5] M. Mofid and P. Khosravi," Non-Linear Analysis of Disposable Knee
Bracing," Computers & Structures, no. 75, pp. 65-72, 2000.
@article{"International Journal of Architectural, Civil and Construction Sciences:52841", author = "Farzan Namvari and Panam Zarfam", title = "Seismic Behavior Evaluation of Semi-Rigid Steel Frames with Knee Bracing by Modal Pushover Analysis (MPA)", abstract = "Nowadays use of a new structural bracing system
called 'Knee Bracing System' have taken the specialists attention too
much. On the other hand nonlinear static analysis procedures in
estimate structures performance in earthquake time have taken
attention too much. One of these procedure is modal pushover
analysis (MPA) procedure. The accuracy of MPA procedure for
simple steel moment resisting frame has been verified and considered
in Chintanapakdee and Chopra-s article in 2003. Since the accuracy
of MPA procedure has not verified for semi-rigid steel frames with
knee bracing, we are going to get through with this matter in this
study. For this purpose, the selected structures are four frames with
different heights, 5 to 20 stories, will be designed according to AISC
criteria. Then MPA procedure is used for the same frames with
different rigidity percentiles of connections. The results of seismic
responses are compared with dynamic nonlinear response history
analysis as exact procedure and accuracy of MPA procedure is
evaluated. It seems that MPA procedure accuracy will come down by
reduction of the rigidity percentiles of semi-rigid connections.", keywords = "Knee Bracing, Modal Pushover Analysis, SeismicBehavior, Semi-Rigid Connections.", volume = "5", number = "4", pages = "177-6", }