scholarly journals Seismic damage detection for a steel braced frame structure

2015 ◽  
Vol 168 (9) ◽  
pp. 636-648 ◽  
Author(s):  
Daniel P. McCrum ◽  
Andrea Staino
Keyword(s):  
Damage Detection ◽  
Seismic Damage ◽  
Frame Structure ◽  
Braced Frame ◽  
Steel Braced Frame

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.

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.

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.

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.

11.06: Application of hybrid simulation for the evaluation of the buckling response of steel braced frame columns

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 2877-2886 ◽  
Author(s):  
Ali Imanpour ◽  
Martin Leclerc ◽  
Romain Siguier ◽  
Robert Tremblay
Keyword(s):  
Hybrid Simulation ◽  
Braced Frame ◽  
Steel Braced Frame

scholarly journals Structural Seismic Damage Assessment Method Based on Structural Dynamic Characteristics

2022 ◽  
Author(s):  
Mingzhen Wang ◽  
Lin Gao ◽  
Zailin Yang
Keyword(s):  
Damage Assessment ◽  
Seismic Damage ◽  
Assessment Method ◽  
Frame Structure ◽  
Fundamental Period ◽  
Deformation Pattern ◽  
Seismic Action ◽  
Building Structure ◽  
Structural Dynamic ◽  
Seismic Damage Assessment

Abstract The seismic damage state of building structure can be evaluated by observing the fundamental period change of structure. Firstly, the fundamental period calculation formula that adapts to the deformation pattern and distribution mode of horizontal seismic action for reinforced concrete frame structure is derived. Secondly, the seismic damage assessment standard of building structure considering period variation is established. Then, the seismic damage assessment method of building structure is constructed. Finally, the seismic damage example is used to verify the established evaluation method. The results show that the established research method has high accuracy and good engineering practicability.

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