Experimental and numerical investigations into seismic performance of timber-steel hybrid structure with supplemental dampers

2017 ◽  
Vol 151 ◽  
pp. 33-43 ◽  
Author(s):  
Zheng Li ◽  
Hanlin Dong ◽  
Xijun Wang ◽  
Minjuan He
Keyword(s):  
Seismic Performance ◽  
Hybrid Structure ◽  
Numerical Investigations ◽  
Supplemental Dampers

Effects of Brace Stiffness and Nonlinearity of Viscous Dampers on Seismic Performance of Structures

2021 ◽  
pp. 2150188
Author(s):  
Siyuan Li ◽  
Yung-Tsang Chen ◽  
Y. H. Chai ◽  
Bo Li
Keyword(s):  
Seismic Performance ◽  
Structural Performance ◽  
Design Parameters ◽  
Viscous Dampers ◽  
Story Structure ◽  
Design Efficiency ◽  
Time Stepping ◽  
Seismic Hazard Mitigation ◽  
Method Effects ◽  
Supplemental Dampers

In the applications of supplemental dampers for seismic hazard mitigation, the supporting braces for the dampers are considered an important component for ensuring an efficient energy dissipation in the structure. Despite their importance, studies on the effects of the brace stiffness and the velocity exponent in the case of nonlinear viscous dampers are rather limited. In this paper, a numerical time-stepping method is developed for computing the seismic response of the structure with supporting braces and nonlinear viscous dampers. Using the proposed method, effects of the parameters of the nonlinear damper-brace systems are investigated, using first a single-story structure, followed by multi-story buildings. Results indicated that the design parameters for the dampers and supporting braces may be combined in numerous ways to satisfy a given set of structural performance objectives, but the brace stiffness can be minimized to achieve design efficiency in the range of velocity exponent commonly used for seismic applications of nonlinear viscous dampers. Results also indicated that for a set brace stiffness, if the dampers are optimally designed, the velocity exponent has an insignificant effect on the structural seismic performance objectives considered in this paper.

Effect of Viscous Damper on Seismic Performance of Steel-Concrete Hybrid Structure for High-Rise Building

2010 ◽  
Vol 163-167 ◽  
pp. 2203-2208
Author(s):  
De Jian Shen ◽  
Sen Qiu ◽  
Ling Song ◽  
Cong Bin Huang
Keyword(s):  
Seismic Performance ◽  
Seismic Analysis ◽  
Dynamic Properties ◽  
Lateral Displacement ◽  
Hybrid Structure ◽  
Seismic Intensity ◽  
Viscous Damper ◽  
High Rise ◽  
High Rise Building ◽  
Story Drift

In this paper, the effect of viscous damper on seismic performance of steel-concrete hybrid structure for high-rise building is analyzed. The result shows that viscous damper has little effect on dynamic properties of structure. The story lateral displacement, story drift rotation and damage of structure can be reduced effectively by viscous damper. The effect of the viscous damper on structure seismic performance is better with the increase of seismic intensity. Under the 7, 8 and 9 degree seismic seldom intensity, the story lateral displacement of the top floor decreases at 17.2%, 23.3%, 33.4% and the story drift rotation decreases at 20.8%, 27.2%, 44.7% respectively. The seismic analysis result may be referred by designer and researcher.

Seismic Performance Evaluation of a Super-Tall Building Structure

2012 ◽  
Vol 446-449 ◽  
pp. 2357-2360
Author(s):  
Ying Zhou ◽  
Lei Hong
Keyword(s):  
Performance Evaluation ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Response Spectrum ◽  
Hybrid Structure ◽  
Elastic Response ◽  
Response Spectrum Analysis ◽  
Seismic Performance Evaluation ◽  
Steel Reinforced Concrete ◽  
Tall Structure

This paper carried out the seismic performance evaluation of a super-tall hybrid structure. The hybrid structure consists of steel reinforced concrete (SRC) frame and reinforced concrete (RC) core wall. Based on the characteristics of the structure, the structural system, seismic performance objectives and seismic measures are presented. Moreover, the elastic response spectrum analysis, elastic and elasto-plastic dynamic analysis are performed to evaluate the seismic behavior of the structure at different seismic hazard levels. The conclusion can be drawn that through the seismic measures taken in the paper, the super-tall structure could generally achieve the seismic performance objectives.

Numerical Investigations of Different Seismic Retrofit Techniques for Flat-Slab Structures

2012 ◽  
Vol 267 ◽  
pp. 42-45
Author(s):  
Marco Valente
Keyword(s):  
Seismic Performance ◽  
Residential Buildings ◽  
Plastic Hinge ◽  
Structural Response ◽  
Seismic Retrofit ◽  
Eurocode 8 ◽  
Earthquake Intensity ◽  
Flat Slab ◽  
Numerical Investigations ◽  
Ground Motion Records

The construction of reinforced concrete (RC) buildings with flat-slab systems has become widely used in some high seismicity European countries. This type of structure is particularly common both for office and residential buildings, taking advantage of the reduced floor height to meet economical and architectural demands. Even though some national codes may include rules for the design of these structures, the provisions of Eurocode 8 don’t cover flat-slab frames used as part of the lateral load resisting system. Main results of seismic analyses performed on a six-story RC flat-slab structure are reported in this study. The structural response was predicted using both nonlinear static and dynamic analyses with artificial ground motion records with increasing intensity levels. Different seismic retrofit techniques were applied to enhance the seismic performance of the structure including: 1) insertion of shear wall; 2) confinement of column plastic hinge regions using FRP wrapping; 3) addition of RC column jackets. The predicted seismic performance of the retrofitted models was compared to that of the unretrofitted counterpart. Numerical investigations provide information about the seismic performance of a common type of RC structure not covered by the provisions of Eurocode 8 as well as the potential to mitigate the damage for varying earthquake intensity levels through different retrofit techniques.

Seismic Performance Improvement of Precast Buildings Using Dissipative Friction Devices

2012 ◽  
Vol 256-259 ◽  
pp. 2229-2233
Author(s):  
Marco Valente
Keyword(s):  
Energy Dissipation ◽  
Performance Improvement ◽  
Seismic Performance ◽  
Structural Damage ◽  
Industrial Building ◽  
Structural Members ◽  
Numerical Investigations ◽  
Precast Buildings ◽  
Precast Structures ◽  
Parametric Analyses

This study presents an innovative approach to enhance the seismic performance of precast structures. Friction devices were inserted at the beam-to-column connections with the aim of providing supplemental energy dissipation and structural drift control. A single-story industrial building and a multi-story frame were analyzed in this study to assess the effectiveness of the dissipative friction devices. A simplified model describing the hysteretic behaviour of the friction device was developed and parametric analyses were carried out in order to establish the optimum value of the plastic moment of the device for the different precast structures. The results of the numerical investigations showed that the installation of the friction devices caused a significant decrease of displacements at the top of the structures. The energy dissipation mostly concentrated in the devices and the plastic demand on structural members was considerably reduced, along with the potential for structural damage.

Dynamic Elasto-Plastic Analysis of a High-Rise Hybrid Structure

2011 ◽  
Vol 71-78 ◽  
pp. 266-269
Author(s):  
Yang Cheng Li ◽  
Mei Gao
Keyword(s):  
Seismic Performance ◽  
Nonlinear Dynamic ◽  
Structural Response ◽  
Hybrid Structure ◽  
Performance Objective ◽  
Seismic Performance Evaluation ◽  
High Rise ◽  
Response Information ◽  
Plastic Analysis ◽  
Nonlinear Dynamic Analyses

Dynamic elasto-plastic analysis methods can actually indicate the characteristic of structure. This paper is concerned with the seismic performance evaluation of a super high-rise hybrid structure by using nonlinear dynamic procedure (NDP). By reasonable selection of input ground motions, the nonlinear dynamic analyses are carried out by using CANNY program. Then the seismic responses of hybrid structure under three different earthquake intensities are obtained. Comparing the responses of three levels with pre-established performance objective, the results show that all responses meet the requirements. At the same time, the inter-storey shear drifts are mentioned to judge the seismic behaviors of hybrid structure. Based on the large amount of structural response information, conclusion can be drawn that the super high-rise hybrid structure achieves the seismic performance objective.

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