scholarly journals Full-Scale Blast Tests on a Conventionally Designed Three-Story Steel Braced Frame with Composite Floor Slabs

Vibration ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 865-892
Author(s):  
Michalis Hadjioannou ◽  
Aldo E. McKay ◽  
Phillip C. Benshoof
Keyword(s):  
Full Scale ◽  
Frame Structure ◽  
Blast Loads ◽  
Braced Frames ◽  
Test Program ◽  
Braced Frame ◽  
Earthquake Loads ◽  
Floor Slabs ◽  
Minimal Damage ◽  
Steel Braced Frame

This paper summarizes the findings of two full-scale blasts tests on a steel braced frame structure with composite floor slabs, which are representative of a typical office building. The aim of this research study was to experimentally characterize the behavior of conventionally designed steel braced frames to blast loads when enclosed with conventional and blast-resistant façade. The two tests involved a three-story, steel braced frame with concentrical steel braces, which are designed to resist typical gravity and wind loads without design provisions for blast or earthquake loads. During the first blast test, the structure was enclosed with a typical, non-blast-resistant, curtainwall façade, and the steel frame sustained minimal damage. For the second blast test, the structure was enclosed with a blast-resistant façade, which resulted in higher damage levels with some brace connections rupturing, but the building did not collapse. Observations from the test program indicate the appreciable reserved capacity of steel brace frame structures to resist blast loads.

Development of a Hybrid Simulation Computational Model for Steel Braced Frames

2018 ◽  
Vol 763 ◽  
pp. 609-618
Author(s):  
Ali Imanpour ◽  
Robert Tremblay ◽  
Martin Leclerc ◽  
Romain Siguier
Keyword(s):  
Computational Model ◽  
Hybrid Simulation ◽  
Structural Testing ◽  
Frame Structure ◽  
Axial Stiffness ◽  
Braced Frames ◽  
Element Analysis ◽  
Braced Frame ◽  
Concentrically Braced Frame ◽  
Dynamic Hybrid

Hybrid simulation is an economical structural testing technique in which the critical part of the structure expected to respond in the inelastic range is tested physically whereas the rest of the structure is modelled numerically using a finite element analysis program. The article describes the development of a computational model for the hybrid simulation of the seismic collapse of a steel two-tiered braced frame structure due to column buckling. The column stability response in multi-tiered braced frames is first presented using a pure numerical model of the braced frame studied. The development of the hybrid simulation computational model is then discussed. Effects of initial out-of-straightness imperfections and axial stiffness, P-Delta analysis approach, and gravity analysis technique on the hybrid simulation results are evaluated using a numerical hybrid simulation model. Finally, the results of a continuous pseudo-dynamic hybrid simulation of the seismic response of the steel multi-tiered concentrically braced frame are presented. The test showed that failure of columns by instability is a possibility and can lead to collapse of multi-tiered braced frames, as was predicted by numerical analysis. Furthermore, suitable modeling methods are proposed for hybrid simulation of steel braced frame structures.

Code provisions for seismic design for concentrically braced steel frames

1992 ◽  
Vol 19 (6) ◽  
pp. 1025-1031 ◽  
Author(s):  
R. G. Redwood ◽  
A. K. Jain
Keyword(s):  
Seismic Design ◽  
Structural Engineering ◽  
Steel Frames ◽  
Braced Frames ◽  
Concentrically Braced Frames ◽  
Braced Frame ◽  
Concentrically Braced ◽  
Interstorey Drift ◽  
Available Information ◽  
Steel Braced Frame

Extensive research into the inelastic seismic response of concentrically braced frames and their components has been carried out in the last two decades. This knowledge has now been incorporated into seismic design practice in several countries, notably the U.S.A., Canada, and New Zealand. In this paper, design specifications from these three countries, which derive largely from the same body of research, are compared. The basic design philosophy for concentrically braced steel frames, loading, and member detailing are examined. It is concluded that, in general, the Canadian specifications are in conformity with the available information and have many similar features to codes of the other countries. Significant differences exist in the classification of braced frames, between interstorey drift requirements, in the treatment of dual structural systems, and to a lesser extent in member detailing requirements. Some features of Canadian codes meriting review are identified. Key words: structural engineering, earthquakes, standards, steel, braced frame, ductility, concentric bracing, dual system.

Seismic Design, Analysis and Testing of a Friction Steel Braced Frame System for Multi-Storey Buildings in Vancouver

2018 ◽  
Vol 763 ◽  
pp. 1077-1086 ◽  
Author(s):  
Lucia Tirca ◽  
Ovidiu Serban ◽  
Robert Tremblay ◽  
Yan Jiang ◽  
Liang Chen
Keyword(s):  
Energy Dissipation ◽  
Seismic Response ◽  
Dynamic Testing ◽  
Seismic Energy ◽  
Elastic Stiffness ◽  
Full Scale ◽  
Experimental Program ◽  
Test Program ◽  
Braced Frame ◽  
Seismic Displacement

This article describes the application of the Friction Braced Frames (FBF) system for 4-and 10-storey buildings located in Vancouver, BC, in Canada. The FBF is coupled with a secondary moment resisting frame that provides back-up elastic stiffness and re-centring capacity that contribute to reduce storey drifts and more evenly distribute seismic energy dissipation over the frame height. In this study, the energy dissipation components consist of Pall friction devices and the system was designed using a conventional force-based method. The moment frame was proportioned to remain essentially elastic under the design seismic displacements. The seismic response of the system is examined through nonlinear response history dynamic analysis. An exhaustive test program was developed to verify the capacity of the system to sustain the anticipated seismic demand. Full-scale testing was performed on brace sub-assemblages and individual brace specimens equipped with friction elements. The experimental program included full-scale dynamic testing under real-time seismic displacement histories as obtained from response history analysis. The numerical simulations and test program showed that the dual FBF system represents an effective system for enhanced seismic response of multi-storey building applications in high seismic regions.

Analysis of Steel Braced Frame Structure Response Encountered Higher Seismic Intensity

2012 ◽  
Vol 166-169 ◽  
pp. 1117-1120
Author(s):  
Ming Li ◽  
Yong Fang Liu ◽  
Lian Guang Jia ◽  
Yong Liu ◽  
Jingfeng Du
Keyword(s):  
Shear Strength ◽  
Seismic Performance ◽  
Seismic Intensity ◽  
Frame Structure ◽  
Braced Frame ◽  
Structure Response ◽  
Design Requirements ◽  
The Stability ◽  
Steel Braced Frame ◽  
Steel Frame Structure

Structure may encounter higher seismic fortification intensity than adopted. So how the structure reacts in that case becomes a concerned problem for civil engineers. In order to solve the problem, the response of a steel braced frame structure is analyzed in this paper when facing higher seismic fortification intensity. The result shows that the lateral sway between layers, the vertex displacement, the bending and shear strength of the frame beams and the stability of the components are still meet the design requirements, and steel frame structure has good seismic performance.

Study on Deformation Performances of Steel Braced Frame Structures with Random Imperfections

2014 ◽  
Vol 644-650 ◽  
pp. 543-546
Author(s):  
Lu Jin ◽  
Han Si ◽  
Lian Guang Jia
Keyword(s):  
Lateral Displacement ◽  
Frame Structures ◽  
Braced Frames ◽  
Braced Frame ◽  
Initial Imperfections ◽  
Finite Element Software ◽  
Ultimate Deformation ◽  
Steel Frame Structures ◽  
Advanced Analysis ◽  
Steel Braced Frame

In order to research the random initial imperfections on the influence of steel braced frame structures deformation,the full-path advanced analysis by using the finite element software ANSYS for 20-story steel frame structures with the symmetrical arrangement of brace.The random initial imperfections in structural system and its individual members could be taken into account by Monte Carlo method,the lateral displacement of columns and the mid-span deflection of beams are gained according to probability statistics,and analysis method of various standards were compared.Results indicate that the ultimate deformation of steel braced frames are proportional to the size of the initial imperfections;The braced frame deformation considering random initial imperfections are closed to the results of ideal frames without imperfection.The ultimate bearing capacity calculated by advanced analysis of high-rise steel braced frame structures often does not meet the requirements of serviceability limit ,structural design ultimately controlled by the displacement limit.

scholarly journals Damage Identification of a Steel Frame Based on Integration of Time Series and Neural Network under Varying Temperatures

2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Minshui Huang ◽  
Wei Zhao ◽  
Jianfeng Gu ◽  
Yongzhi Lei
Keyword(s):  
Time Series ◽  
Damage Identification ◽  
Structural Response ◽  
Frame Structure ◽  
Braced Frame ◽  
Temperature Variations ◽  
Damage Scenarios ◽  
Ann Models ◽  
Output Only ◽  
Steel Braced Frame

The effect of varying temperatures is one of the most important challenges of vibration-based damage identification due to its bigger effects on the structural response than the damage itself. This study presents a methodology incorporating the autoregressive (AR) time series model with two-step artificial neural networks (ANNs) to identify damage under temperature variations. AR coefficients, which are extracted by fitting the AR models to acceleration responses, are however sensitive to temperature changes, resulting in false diagnoses. Thus, two-step ANN models with the inputs of difference in AR coefficients are utilized to compensate the detrimental temperature variations. Finite element (FE) models of a steel-braced frame structure, simulating several damage scenarios with different damage locations and severities at fluctuating temperatures, are used to verify the effectiveness and reliability of this approach. Numerical results indicate that the proposed approach could successfully recognize, locate, and quantify damage by using output-only vibration and temperature data regardless of varying temperatures and noise perturbations.

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