scholarly journals Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

2019 ◽  
Vol 9 (24) ◽  
pp. 5486 ◽  
Author(s):  
Shuang Li ◽  
Jintao Zhang
Keyword(s):  
Optimum Design ◽  
Computational Cost ◽  
Time History ◽  
Economic Benefits ◽  
Frame Structure ◽  
Viscous Damper ◽  
Viscous Dampers ◽  
Frame Model ◽  
Rare Earthquake ◽  
Original Frame

The study proposes a retrofitting method with an optimum design of viscous dampers in order to improve the structural resistant capacity to earthquakes. The retrofitting method firstly uses a 2D frame model and places the viscous dampers in the structure to satisfy the performance requirements under code-specific design earthquake intensities and then performs an optimum design to increase the structural collapse-resistant capacity. The failure pattern analysis and fragility analysis show that the optimum design leads to better performance than the original frame structure. For regular structures, it is demonstrated that the optimum pattern of viscous damper placement obtained from a 2D frame model can be directly used in the retrofitting of the 3D frame model. The economic loss and repair time analyses are conducted for the retrofitted frame structure under different earthquake intensities, including the frequent earthquake, the occasional earthquake, and the rare earthquake. Although the proposed method is based on time-history analyses, it seems that the computational cost is acceptable because the 2D frame model is adopted to determine the optimum pattern of viscous damper placement; meanwhile, the owner can clearly know the economic benefits of the retrofitting under different earthquake intensities. The retrofitting also causes the frame to have reduced environmental problems (such as carbon emission) compared to the original frame in the repair process after a rare earthquake happens.

Viscous Dampers Installation Arrangement and Hysteresis Curve Characteristics Research on the Mega-Sub Controlled Structure System

2011 ◽  
Vol 71-78 ◽  
pp. 1687-1690 ◽  
Author(s):  
Tao Li ◽  
Xun An Zhang ◽  
Toi Limazie
Keyword(s):  
Dynamic Characteristics ◽  
Dynamic Responses ◽  
Frame Structure ◽  
Hysteresis Curve ◽  
Control Effect ◽  
Viscous Dampers ◽  
Earthquake Excitation ◽  
Structure System ◽  
Controlled Structure ◽  
Rare Earthquake

This paper focuses on viscous dampers disposition schemes regarding the vibration control of the Mega-Sub Controlled Structure System (MSCSS) subjected to rare earthquake excitation. It is intended in this study to evaluate the dynamic characteristics of the MSCSS compared with the traditional mega frame structure. The optimum arranging scheme matched with dynamic characteristics of MSCSS is given by analyzing the dynamic responses of the structure with different arrangements of viscous dampers on structure. Characteristics of hysteresis curve of viscous dampers in the optimum scheme are also investigated. Results shows that when dampers are installed in the two middle stories of the two sub-structures, the acceleration and displacement of MSCSS are well controlled compared to the conventional mega frame, reaching the optimum control effect. It is also shown that dampers are an indispensable component on MSCSS configuration. Reasonable arrangement of dampers on MSCSS can accurately contribute to improve structure seismic resistance. The efficiency of this structural system is fully presented through the optimum arrangement.

scholarly journals Effectiveness of fluid viscous damper for steel frame building subjected to earthquake load

2021 ◽  
Vol 263 ◽  
pp. 03015
Author(s):  
Thanh Binh Pham ◽  
Ngoc Quang Vu
Keyword(s):  
Dynamic Response ◽  
Time History ◽  
Steel Frame ◽  
Frame Structure ◽  
Seismic Load ◽  
Viscous Damper ◽  
Maximum Displacement ◽  
Fluid Viscous Damper ◽  
Frame Building ◽  
Earthquake Load

Since the appearance of the first modern multistories buildings, besides the demand of ensuring the bearing capacity, one of the urgent problems facing the engineer is to do how to design structure to ensure the requirements of normal use such as displacement, motion acceleration within permissible limits. There exist many methods to reduce these response of structure under lateral load. Among these, using fluid viscous damper (FVD) is one of the most applied equipment because of its simplicity. This paper presents the examination of eight-story steel frame structure subjected to seismic load. The FVD system is defined in Etabs with link properties. In each story, four dampers are located in each direction of plan, with two on each side of the center of stiffness of the story. The time history analysis was conducted to study the structure subjected to seimic load collected from the function library of program Etabs. The effect of FVD system was determined by the dynamic response of the building and displacement indexes such as maximum displacement of roof, story drift ratio. The results show that, all the dynamic response characters of structure were decreased significantly when providing the FVD to it.

Experimental and Simulation Study of a Hybrid Frame Structure with Viscous Dampers

2012 ◽  
Vol 446-449 ◽  
pp. 894-899
Author(s):  
Hong Mei Zhang ◽  
Xi Lin Lu ◽  
Chun Guang Meng
Keyword(s):  
Shaking Table Test ◽  
Time History ◽  
Shaking Table ◽  
Frame Structure ◽  
Nonlinear Time History Analysis ◽  
Seismic Action ◽  
Test Model ◽  
Viscous Dampers ◽  
Scaled Model ◽  
Nonlinear Simulation

A Concrete-filled Rectangular Steel Tube (CRST) frame structure is studied in this paper by shaking table model test and nonlinear simulation. A number of viscous dampers are employed to insure the function of the building especially under seismic action for some of the main vertical elements of the building are not continuous. A shaking table test of a scaled model was conducted under different earthquake waves to investigate the structural behavior. And the nonlinear time-history analysis for the shaking table test model was also carried out by finite element analysis program according to the shaking table test. The simulation model was constructed in accordance with the tested specimen and the simulation effect was then validated by the tested results. To sum up, (1) there are no obvious weak stories on the damping equipped structure; (2) the dampers can reduce the displacement of the irregular to a certain degree.

scholarly journals Seismic Design and Performances of Frame Structures Connected to a Strongback System and Equipped with Different Configurations of Supplemental Viscous Dampers

2021 ◽  
Vol 7 ◽  
Author(s):  
Michele Palermo ◽  
Vittoria Laghi ◽  
Giada Gasparini ◽  
Stefano Silvestri ◽  
Tomaso Trombetti
Keyword(s):  
Time History ◽  
Elastic Field ◽  
Frame Structure ◽  
Viscous Dampers ◽  
Single Degree Of Freedom ◽  
Fluid Viscous Dampers ◽  
Moment Resisting Frame ◽  
Moment Resisting ◽  
Supplemental Dampers ◽  
Dynamic Time

The paper investigates the dynamic behavior of structural systems obtained by connecting a moment-resisting frame structure with a vertical rigid truss pinned at the base, known in literature as “strongback,” and equipped with added fluid-viscous dampers. The strongback, designed in order to remain in the elastic field under strong seismic ground motion, acts as a mast by imposing to the structure a linear lateral deformed shape. By regularizing the lateral drift profile of the structure, the strongback limits undesired effects such as weak-storey mechanisms, damage concentration and residual drifts. In addition, when supplemental dampers are inserted in the structure, a considerable amount of energy can be dissipated, thus reducing the peak seismic response. The aim of the work is twofold: i) to provide analytical formulations for the preliminary design of added dampers based on the Generalized Single Degree Of Freedom (GSDOF) concept, and ii) to evaluate the increase in energy dissipation capabilities for selected dampers configurations thanks to the presence of the strongback. The formulas are developed for different configurations of added viscous dampers: dampers inserted within the frame between all or selected consecutive storeys (inter-storey placement) and dampers located at the base of the strongback to realize a rigid “dissipative tower.” The effectiveness of the dampers configurations is evaluated through dynamic time-history analyses.

Comparison of Stiffness Degradation of Special-Shaped Column and Rectangular Column Structure in Earthquake

2013 ◽  
Vol 838-841 ◽  
pp. 1492-1496
Author(s):  
Yi Ying Li ◽  
Wen Pan ◽  
Xiao Feng Zou
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Base Isolation ◽  
Time History ◽  
Frame Structure ◽  
Analysis Model ◽  
Element Analysis ◽  
Finite Element Software ◽  
Column Structure ◽  
Rare Earthquake

In this paper, using the finite element software PERFORM3D to establish the finite element analysis model for isolation and seismic frame structure with special-shaped column and rectangular column frame structure, and the overall structure of the moderate and strong elastic and nonlinear earthquake time-history analysis to get the dynamic characteristics, from two aspects of the damping coefficient in horizontal direction and the energy dissipation, investigation structure in earthquake and rare earthquake of superstructure stiffness attenuation. It can be drawn only seismic resistance measures are taken, the special-shaped column structure under rare earthquake stiffness attenuation speed is greater than the rectangular column, if after using base isolation technology, although the special-shaped column stiffness attenuation rate is still greater than the rectangular column, but the two energy dissipation ability.

An Optimal Distribution Strategy for Energy Dissipation Damper

2013 ◽  
Vol 639-640 ◽  
pp. 882-885
Author(s):  
Min Chen ◽  
Guo Jing He ◽  
Chang Liu
Keyword(s):  
Energy Dissipation ◽  
Vibration Isolation ◽  
Time History ◽  
Time History Analysis ◽  
Frame Structure ◽  
Viscous Dampers ◽  
Distribution Strategy ◽  
Acceleration Time History ◽  
History Analysis ◽  
The Ideal

A certain amount of viscous dampers are installed in the 10-storey frame structure in line with different distribution strategies, and then 2 sets of strong earthquake records and 1 set of artificial acceleration time-history curve are selected to conduct the time-history analysis under both frequently and rarely earthquakes via ETABS software. Based on the comparison of the time-history analysis results in various working cases, the ideal energy dissipation results can be obtained when the dampers are installed in the lower stories with a larger storey drift, which also help to utilize the upper space of the structure. The time-history analysis shows that the viscous dampers installed in the lower part of a building have a better effectiveness of vibration isolation than those in the upper parts, and it is no necessary to install too many dampers, for the energy dissipation effects tend to be steady when the number of dampers has been increased to a level.

Seismic Analysis of L-Shaped Irregular Plane Frame Structure with Viscous Dampers

2014 ◽  
Vol 501-504 ◽  
pp. 1547-1550 ◽  
Author(s):  
Peng Deng ◽  
Xin Li ◽  
Wei Dong ◽  
Lei Tai
Keyword(s):  
Seismic Analysis ◽  
Vibration Characteristics ◽  
Frame Structure ◽  
Structural Deformation ◽  
Base Shear ◽  
Viscous Dampers ◽  
Plane Frame ◽  
The Common ◽  
Rare Earthquake

L-shaped plane structure in the common buildings cannot meet seismic requirements because of significant torsion. According to the analysis of the vibration characteristics, structural deformation and base shear of irregular L-shaped plane structure under frequent and rare earthquake, four arrangement plans of viscous dampers are proposed to adjust the stiffness of the structure. The layout principles of viscous dampers are obtained by comparing effects of different arrangements such as in the periphery, in the short sides, in the long sides and in both short and long sides.

Study on Seismic Performance of Unsymmetrical K-Type Friction Energy Dissipation Brace

2013 ◽  
Vol 353-356 ◽  
pp. 1879-1882
Author(s):  
Yi Xiang Xu ◽  
Wen Pan ◽  
Sheng Lan Zhu
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Time History ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Concrete Frame ◽  
Finite Element Software ◽  
Friction Energy ◽  
To Come ◽  
Rare Earthquake

The multi-storey reinforced concrete frame structure whose frame has been added with a kind of unsymmetrical K-type friction energy dissipation brace is taken as an example in this article. The time history analysis of different angles of unsymmetrical K-type friction energy dissipation brace and symmetrical K-type friction energy dissipation brace under the rare earthquake has been done by using the finite element software SAP2000. The analysis and comparison on the seismic performance shows that symmetrical K-type friction energy dissipation brace under certain conditions. Plan layout could be more flexible by using the result obtained which could become a reference for design in days to come.

Study on Rational Ratios of Lateral Stiffness for Masonry Building with Frame Structure at First Two Stories

2012 ◽  
Vol 174-177 ◽  
pp. 2012-2015
Author(s):  
Xiao Long Zhou ◽  
Ying Min Li ◽  
Lin Bo Song ◽  
Qian Tan
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Shear Wall ◽  
Calculation Model ◽  
Frame Structure ◽  
Wall Structure ◽  
Masonry Building ◽  
Lateral Stiffness ◽  
Stiffness Ratio ◽  
Lateral Stiffness Ratio

There are two typical seismic damage characteristics to the masonry building with frame shear wall structure at first two stories, and the lateral stiffness ratio of the third storey to the second storey is one of the key factors mostly affecting the seismic performance of this kind of building. However, some factors are not considered sufficiently in current Chinese seismic codes. According to the theory of performance-based seismic design, the seismic performance of this kind of structure is analyzed in this paper by taking time-history analysis on models which with different storey stiffness ratios. The results show that when the lateral stiffness ratio controlled in a reasonable range, the upper masonry deformation can be ensured in a range of elastic roughly, and the bottom frame can be guaranteed to have sufficient deformation and energy dissipation capacity. Finally, according to the seismic performance characteristics of masonry building with frame shear wall structure at first two stories, especially the characteristics under strong earthquakes, a method of simplified calculation model for the upper masonry is discussed in this paper.

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