scholarly journals Maximum inter-story drift demands of steel frames in terms of the intensity measure INp

2017 ◽  
Vol 11 ◽  
pp. 73-78
Author(s):  
Edén Bojórquez ◽  
Victor Baca ◽  
Juan Bojórquez ◽  
Alfredo Reyes-Salazar ◽  
Robespierre Chávez ◽  
...  
Keyword(s):  
Steel Frames ◽  
Intensity Measure ◽  
Story Drift

On the Use of Vector-Valued Intensity Measure to Predict Peak and Cumulative Demands of Steel Frames under Narrow-Band Motions

2014 ◽  
Vol 595 ◽  
pp. 137-142 ◽  
Author(s):  
Edén Bojórquez ◽  
Alfredo Reyes-Salazar ◽  
Sonia E. Ruiz
Keyword(s):  
Narrow Band ◽  
Ground Motions ◽  
Steel Frames ◽  
Spectral Shape ◽  
Intensity Measure ◽  
Intensity Measures ◽  
Energy Demands ◽  
Long Duration ◽  
Story Drift ◽  
Vector Valued

In this study, various alternative vector-valued ground motion intensity measures (IMs) are used to estimate maximum inter-story drifts and hysteretic energy demands of steel framed buildings under long duration narrow-band ground motions. The vectors are based on the spectral acceleration at first mode of the structure as first parameterSa (T1). As the second parameter of the vector,IMsrelated to peak, integral and spectral shape parameters are selected. It is concluded that spectral-shape-based vector-valuedIMshave the best relation with maximum inter-story drift and energy demands in steel frames subjected to narrow-band earthquake ground motions.

scholarly journals Seismic Response Analysis of Multi-Story Steel Frames Using BRB and SCB Hybrid Bracing System

2019 ◽  
Vol 10 (1) ◽  
pp. 284 ◽  
Author(s):  
Rong Chen ◽  
Canxing Qiu ◽  
Dongxue Hao
Keyword(s):  
Seismic Response ◽  
Seismic Analysis ◽  
Steel Frames ◽  
Residual Deformation ◽  
High Energy ◽  
Response Analysis ◽  
Building Structures ◽  
Seismic Capacity ◽  
Story Drift ◽  
Bracing System

Multi-story steel frames are popular building structures. For those with insufficient seismic resistance, their seismic capacity can be improved by installing buckling-restrained braces (BRBs), which is known for high energy dissipation capacity, and the corresponding frame is denoted as BRB frame (BRBF). However, BRBFs are frequently criticized because of excessive residual deformations after earthquakes, which impede the post-event repairing work and immediate occupancy. Meanwhile, self-centering braces (SCBs), which were invented with a particular purpose of eliminating residual deformation for the protected structures, underwent fast development in recent years. However, the damping capability of SCBs is relatively small because their hysteresis is characterized by a flag shape. Therefore, this paper aims to combine these two different braces to form a hybrid bracing system. A total of four combinations are proposed to seek an optimal solution. The multi-story steel frames installed with BRBs, SCBs, and combined braces are numerically investigated through nonlinear static and dynamic analyses. Interested seismic response parameters refer to the maximum story drift ratios, maximum floor accelerations, and residual story drift ratios. The seismic analysis results indicate that the frames using the combined bracing system are able to take the advantages of BRBs and SCBs.

SEISMIC PERFORMANCE OF SIX-STORY FABRICATED STEEL FRAMES UNDER PSEUDO-DYNAMIC TESTING

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Cao Zhenggang ◽  
Wan Zongshuai ◽  
Liu Han ◽  
Du Peng ◽  
Fan Feng
Keyword(s):  
Seismic Performance ◽  
Dynamic Testing ◽  
Steel Frames ◽  
Maximum Displacement ◽  
Braced Frame ◽  
Dynamic Experiments ◽  
Story Drift ◽  
Seismic Records ◽  
Beam Height ◽  
Seismic Behaviors

In order to study the seismic behaviors of fabricated steel frames with bolted beam-height adjustable steel beam-to-column connections (BHA connections), a six-story steel frame was designed to run pseudo-dynamic experiments. Experiments were first carried out with the steel frames with and without buckling-restrained braces (BRBs) under three different types of seismic records under 35 gal and 70 gal. Then the seismic records of EL_CENTRO amplified from 220 gal to 1,600 gal were loaded on the braced frame. Results showed that there was no detachment, sliding, or yielding detected in BHA connections. After BRBs were installed, the story drift and the top-story maximum displacement could easily meet the codes, and the structure was still working in the elastic stage under 620 gal. It could therefore be concluded that BHA connections have excellent seismic performance and they are suitable for application in fabricated steel frames. The braced frame using BHA connections has good lateral stiffness and energy dissipation capacity.

scholarly journals CORRELATION BETWEEN INTENSITY MEASURE PARAMETERS OF GROUND MOTION EARTHQUAKES AND STRUCTURAL RESPONSE OF MOMENT RESISTING STEEL FRAMES

2020 ◽  
Vol 32 (3) ◽  
Author(s):  
Emad Ali Elhout
Keyword(s):  
Ground Motion ◽  
Pearson Correlation ◽  
Steel Frames ◽  
Structural Response ◽  
Time History ◽  
Base Shear ◽  
Intensity Measure ◽  
Response Parameter ◽  
Drift Ratio ◽  
Moment Resisting

Identify and select a suitable ground motion intensity measure (IMs) parameters associated with the structural response to specific levels of damages or collapse in structures are very important in the seismic response of structural analyses. This paper investigated the correlation between 25 intensity measure (IMs) parameters of earthquakes and the structural response parameters of 3-, 6- and 12-story moment resisting steel frames (MRSFs). Nonlinear time history analyses are performed for these frames under near- and far-source ground motion records. The maximum story drift ratio (MSDR), the roof drift ratio (RDR), and the maximum base shear force (SF) are chosen as the structural response parameters. The Pearson correlation coefficient with the regression analyses is utilized to display the correlation between the structural response parameter and the ground motion IMs parameters. The results reveal that MSDR appears to be a suitable engineering demand parameter to correlate with most of the ground motion IMs parameters compared to both the RDR and the SF parameters. Also, Max. Incremental velocity (MIV) parameter is considered as the highest correlated IMs parameters with MSDR in both near- and far-source earthquakes.

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