Hybrid simulation of a zipper-braced steel frame under earthquake excitation

2009 ◽  
Vol 38 (1) ◽  
pp. 95-113 ◽  
Author(s):  
T. Y. Yang ◽  
B. Stojadinovic ◽  
J. Moehle
Keyword(s):  
Hybrid Simulation ◽  
Steel Frame ◽  
Earthquake Excitation

Soft real-time hybrid simulation based on a space steel frame

2020 ◽  
Vol 18 (6) ◽  
pp. 2699-2722
Author(s):  
Tengfei Li ◽  
Lei Ma ◽  
Yan Sui ◽  
Mingzhou Su ◽  
Yi Qiang
Keyword(s):  
Real Time ◽  
Hybrid Simulation ◽  
Steel Frame ◽  
Simulation Based

Multi-Scale Elastoplastic Dynamic Analysis of Steel Frame Welded Connections under Strong Earthquake Excitation

2014 ◽  
Vol 501-504 ◽  
pp. 1604-1608 ◽  
Author(s):  
Er Nian Zhao ◽  
Wei Lian Qu
Keyword(s):  
Dynamic Analysis ◽  
Strong Earthquake ◽  
Steel Frame ◽  
Plane Section ◽  
Scale Model ◽  
Determination Method ◽  
Contrastive Analysis ◽  
Earthquake Excitation ◽  
Multi Scale ◽  
Flat Section

Multi-scale elastoplastic dynamic analysis of the welded connections is conducted under the strong earthquake excitation based on a steel frame engineering case. Two types of multi-scale model are built for the contrastive analysis, and the plastic deformation of the connection section is extracted to investigate the application of the plane-section assumption. The results indicate that elastic-plastic status makes the column and beam sections not meet the flat section assumption. Finally, the determination method of the refined modeling zone is studied based on the application of the plane-section assumption.

Displacement-Based Seismic Design of Steel Frames Strengthened by Buckling-Restrained Braces

2012 ◽  
Vol 217-219 ◽  
pp. 1114-1118 ◽  
Author(s):  
Marco Valente
Keyword(s):  
Steel Frames ◽  
Design Procedure ◽  
Steel Frame ◽  
Seismic Retrofitting ◽  
Target Displacement ◽  
Earthquake Excitation ◽  
Capacity Spectrum ◽  
Buckling Restrained Braces ◽  
Displacement Based ◽  
Nonlinear Dynamic Analyses

This study presents a displacement-based design procedure for seismic retrofitting of steel frames using buckling-restrained braces (BRB) to meet a given target displacement in the framework of the capacity spectrum method. The seismic performance of a six-storey steel frame equipped with BRB is investigated. Different storey-wise BRB distribution methods are proposed and the influence on the results of the design procedure is analyzed. Nonlinear dynamic analyses demonstrate the efficacy of the design procedure showing the improvements achieved by the retrofitting intervention using BRB. The maximum top displacement registered for the retrofitted frame under earthquake excitation coincides with the target displacement obtained in accordance with the design procedure. The introduction of buckling-restrained braces enhances the earthquake resistance of the steel frame, providing significant energy dissipation and the stiffness needed to satisfy structural drift limits.

scholarly journals Mixed Sensitivity-Based Robust H∞ Control Method for Real-Time Hybrid Simulation

Symmetry ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 840
Author(s):  
Xizhan Ning
Keyword(s):  
Real Time ◽  
Control Method ◽  
Weighting Function ◽  
Hybrid Simulation ◽  
Shaking Table ◽  
Transfer System ◽  
Hydraulic Actuator ◽  
Earthquake Excitation ◽  
Engineering Structures ◽  
Weighting Functions

Real-time hybrid simulation (RTHS), dividing the emulated structure into numerical substructures (NS) and physical substructures (PS), is a powerful technique to obtain responses and then to assess the seismic performance of civil engineering structures. A transfer system, a servo-hydraulic actuator or shaking table, is used to apply boundary conditions between the two substructures. However, the servo-hydraulic actuator is inherently a complex system with nonlinearities and may introduce time delays into the RTHS, which will decrease the accuracy and stability of the RTHS. Moreover, there are various uncertainties in RTHS. An accurate and robust actuator control strategy is necessary to guarantee reliable simulation results. Therefore, a mixed sensitivity-based H∞ control method was proposed for RTHS. In H∞ control, the dynamics and robustness of the closed-loop transfer system are realized by performance weighting functions. A form of weighting function was given considering the requirement in RTHS. The influence of the weighting functions on the dynamics was investigated. Numerical simulations and actual RTHSs were carried out under symmetric and asymmetric dynamic loads, namely sinusoidal and earthquake excitation, respectively. Results indicated that the H∞ control method used for RTHS is feasible, and it exhibits an excellent tracking performance and robustness.

Real-time hybrid simulation on high strength steel frame with Y-shaped eccentric braces

2021 ◽  
Vol 226 ◽  
pp. 111369
Author(s):  
Tengfei Li ◽  
Mingzhou Su ◽  
Yan Sui ◽  
Lei Ma
Keyword(s):  
Real Time ◽  
High Strength Steel ◽  
Hybrid Simulation ◽  
High Strength ◽  
Steel Frame

scholarly journals Hybrid Simulation of Seismic Responses of a Typical Station with a Reinforced Concrete Column

2020 ◽  
Vol 10 (4) ◽  
pp. 1331 ◽  
Author(s):  
Xuesong Cai ◽  
Chengyu Yang ◽  
Yong Yuan
Keyword(s):  
Reinforced Concrete ◽  
Failure Process ◽  
Hybrid Simulation ◽  
Test Method ◽  
Shaking Table ◽  
Subway Station ◽  
Test Results ◽  
Earthquake Excitation ◽  
Simulation Process ◽  
Central Column

During the 1995 Kobe earthquake, damages were observed in the Daikai subway station and adjacent tunnels. It was the first large-scale underground structure that failed under the earthquake excitation. Numerical and experimental analyses have been conducted to study the failure process of the Daikai station. However, the issue of the scale ratio still exists in the shaking table tests of underground structures. In order to tackle this issue, a hybrid simulation technique is developed here to study the seismic performance of a typical subway station. Based on the previous research, it is found that the central column is the critical component of the structure. Therefore, a reinforced concrete central column is physically tested in the hybrid simulation process. On the other hand, the remaining parts of the structure and soil domain are numerically modeled at the same time. Four hybrid simulation cases are conducted with peak ground accelerations of 0.01 g, 0.1 g, 0.22 g, and 0.58 g. The test results of displacement and shear force are compared with the analytical results. Moreover, the good agreement between the test results and numerical results validate the accuracy of the proposed hybrid test method. After the hybrid simulation process, a quasi-static test is conducted to illustrate the mechanical properties of the central column after the earthquake excitation.

Hybrid Simulation Method for a Structure Subjected to Fire and Its Application to a Steel Frame

2018 ◽  
Vol 144 (8) ◽  
pp. 04018118 ◽  
Author(s):  
Xuguang Wang ◽  
Robin E. Kim ◽  
Oh-Sung Kwon ◽  
Inhwan Yeo
Keyword(s):  
Hybrid Simulation ◽  
Simulation Method ◽  
Steel Frame
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