Semi-active adaptive control for enhancing the seismic performance of nonlinear coupled buildings with smooth hysteretic behavior

2019 ◽  
Vol 191 ◽  
pp. 536-548 ◽  
Author(s):  
Omar A.S. Al-Fahdawi ◽  
Luciana R. Barroso ◽  
Rachel W. Soares
Keyword(s):  
Adaptive Control ◽  
Seismic Performance ◽  
Hysteretic Behavior ◽  
Coupled Buildings

Seismic Performance of Rocking Frames with Flag-Shaped Hysteretic Behavior

2017 ◽  
Vol 143 (5) ◽  
pp. 04017008 ◽  
Author(s):  
Anastasios I. Giouvanidis ◽  
Elias G. Dimitrakopoulos
Keyword(s):  
Seismic Performance ◽  
Hysteretic Behavior

The Analysis of Hysteretic Behavior of Concrete Filled Double Skin Steel Tubular after Exposure to Fire

2014 ◽  
Vol 580-583 ◽  
pp. 2675-2678 ◽  
Author(s):  
Xiao Liu ◽  
Jun Tao Bao ◽  
Bing Wang
Keyword(s):  
Mechanical Properties ◽  
Seismic Performance ◽  
Mechanical Performance ◽  
Economic Loss ◽  
Hysteretic Behavior ◽  
Fire Performance ◽  
Seismic Capacity ◽  
Double Skin ◽  
Performance Research

In recent years,frequent fires and earthquake make the buildings damage badly,and it causes huge economic loss. Concrete filled double skin steel tubular (Hereinafter referred to as CFDST) as a new member of structure,its mechanical properties are similar to concrete filled steel tubular,at the same time has better fire performance and seismic capacity. Based on this background,the paper expounds study the mechanical performance of CFDST is very important,the hysteretic behavior is the main mechanical indexes of the seismic performance of CFDST after exposure to fire. The study of it will fill the new component in the blank of seismic performance research.

scholarly journals Seismic Performance of Reinforced Concrete Short Columns Subjected to Freeze–Thaw Cycles

2019 ◽  
Vol 9 (13) ◽  
pp. 2708 ◽  
Author(s):  
Yixin Zhang ◽  
Shansuo Zheng ◽  
Xianliang Rong ◽  
Liguo Dong ◽  
Hao Zheng
Keyword(s):  
Reinforced Concrete ◽  
Energy Dissipation ◽  
Shear Deformation ◽  
Seismic Performance ◽  
Shear Failure ◽  
Shear Capacity ◽  
Hysteretic Behavior ◽  
Freeze Thaw ◽  
Failure Patterns ◽  
Short Columns

Previous research shows that freeze–thaw cycles represent one of the most dangerous threats to reinforced concrete (RC) structures. However, there is almost no experimental data on the effects of freeze–thaw cycles on the seismic behavior of RC columns showing flexure-shear failure. In this study, three columns with the shear span-to-depth ratio of 2.5 were subjected to different numbers of freeze–thaw cycles (FTCs) and pseudo-static testing. The seismic performance indexes of the specimens were analyzed in terms of hysteretic behavior, skeleton curves, shear deformation, and energy dissipation. The test observations show that the failure patterns of the test columns altered from the flexure dominated to shear dominated, owing to the more severe deterioration in shear capacity induced by freeze–thaw attack than in flexure capacity. The test results also indicate that freeze–thaw cycles significantly decrease the ductility and energy dissipation of test columns, and they increase the contributions of shear deformation to the total deformation.

Test on Embedded Perforated Steel Plate Shear Wall with Concrete Filled Steel Tube Columns

2011 ◽  
Vol 243-249 ◽  
pp. 1450-1455 ◽  
Author(s):  
Wan Lin Cao ◽  
Wen Jiang Zhang ◽  
Jian Wei Zhang ◽  
Hong Ying Dong
Keyword(s):  
Energy Dissipation ◽  
Bearing Capacity ◽  
Seismic Performance ◽  
Steel Plate ◽  
Shear Wall ◽  
Steel Tube ◽  
Hysteretic Behavior ◽  
Load Bearing Capacity ◽  
Steel Plate Shear Wall ◽  
Circular Holes

In view of the proposal of embedded steel plate concrete shear wall with concrete filled steel tube columns which contains a new kind shear connector of tie-bars through the circular holes linking concrete layers on both sides of the plate. In order to prove the seismic performance of walls with circular holes on the plate, three steel plate shear wall specimens, including the plate without holes bolted with columns, welded with columns, and the perforated plate welded with columns, were tested under cyclic loading. According to the results, the load-bearing capacity, ductility, energy dissipation, hysteretic behavior and failure phenomena were analyzed. It is showed that the load-bearing capacity of the three specimens were quite close. However, the wall with perforated steel plate has better ductility, energy dissipation and hysteretic behavior. So, it is an effective way to improve the seismic performance of walls by means of embedded perforated steel plate instead of ordinary ones.

Analytical Study on Seismic Performance of Switchboard with Hybrid Spring Supports

2013 ◽  
Vol 470 ◽  
pp. 966-969
Author(s):  
Kyung Suk Choi ◽  
Sae Mee Jun ◽  
Waon Ho Yi ◽  
Hyung Joon Kim
Keyword(s):  
Seismic Performance ◽  
Time History ◽  
Small Deformation ◽  
Electrical Equipment ◽  
Hysteretic Behavior ◽  
Vertical Stiffness ◽  
Electric Power Supply ◽  
Acceleration Time Histories ◽  
Time Histories ◽  
Nonlinear Time History

Electrical equipment such as switchboard should be protected from the seismic hazard to enable stable electric power supply even after the earthquake, since its seismic damage results in the severe damage such as social chaos, fire, and explosion. The general method to secure the excellent seismic performance of switchboards is to reduce the inertial forces by introduction of base isolating systems into a switchboard frame. However, the introduction of base isolating systems may cause the increase of installation and manufacturing costs, which is more true for a low-and medium-seismicity zones, such as Korea. In order to solve finance-related problems, this paper evaluates the seismic performance of switchboards supported by the hybrid springs consisting of wire rope elastic mounts with vertical and horizontal direction stiffness and polyurethane that provides additional vertical stiffness and damping. To do this, this study constructs an analytical model that can properly capture the hysteretic behavior of a hybrid spring. Nonlinear time-history analyses were carried out with floor acceleration time-histories taking into account Koreas seismic design quantities. The analysis results show relatively small deformation of switchboard supported by hybrid springs and high resistance against over-turning moments due to additional vertical stiffness of polyurethane.

Experimental Study on Seismic Performance of AAS-CFST Column

2014 ◽  
Vol 670-671 ◽  
pp. 344-348 ◽  
Author(s):  
Wen Feng Chen ◽  
Xiao Hui Yuan ◽  
Bin Li
Keyword(s):  
Axial Compression ◽  
Seismic Performance ◽  
Compression Ratio ◽  
Deformation Mode ◽  
Steel Tube ◽  
Hysteretic Behavior ◽  
Initial Stiffness ◽  
Skeleton Curve ◽  
Smooth Test ◽  
Axial Compression Ratio

Three model specimens of alkali-activated slag concrete filled steel tube (AAS-CFST) with different axial compression ratio and steel ratio were designed and tested in the present study. The seismic performance of the structures were evaluated by testing them with combined lateral constant compression and vertical cyclic loads. The structural performance, such as the testing observations, hysteretic behavior, skeleton curve, stiffness degradation, energy dissipation capacity and ductility performance was discussed in detailed. The results show that all the specimens’ damage were bending deformation mode, and the hysteretic curves are relatively smooth. Test data indicated that increased the axial compression ratio improved the load bearing capacity, initial stiffness.

Comparative Analysis on Seismic Performance of Steel Frame with Different Forms of Symmetric Enhanced Nodes

2013 ◽  
Vol 790 ◽  
pp. 247-251
Author(s):  
Li Ting Dong ◽  
Yan Wang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Comparative Analysis ◽  
Energy Dissipation ◽  
Seismic Performance ◽  
Failure Modes ◽  
Hysteretic Behavior ◽  
Structural Form ◽  
Element Analysis ◽  
Energy Dissipation Capacity

Based on node test and finite element analysis results of four different structural form enhanced nodes,failure modes,hysteretic behavior,bearing capacity,ductility and energy dissipation capacity of nodes are analyzed comprehensively and comparatively for more in-depth exploration about the seismic performance of symmetric enhanced nodes.The results showed that all the symmetric enhanced nodes have full hysteretic curve and energy dissipation capacity. On the whole,The flange-plate reinforced node exhibit better seismic performance.

Seismic Performance of the Masonry Buildings with Frame at the Bottom Equipped with the New Hybrid Damper

2015 ◽  
Vol 744-746 ◽  
pp. 905-910
Author(s):  
Xiang Hong Sun ◽  
Xu Dong Liu ◽  
Yan Jun Fan ◽  
Shuang Jie Ding
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Seismic Performance ◽  
Time History ◽  
Simulation Method ◽  
Hysteretic Behavior ◽  
Masonry Buildings ◽  
Control Effect ◽  
History Analysis ◽  
Hybrid Damper

An improved new damper was presented. The mechanical properties of the damper were conducted by the numerical simulation method under the cyclic loading. Also, the seismic mitigation effectiveness of the damper was verified though Time History Analysis. The results show that the improved damper has good hysteretic behavior. It can significantly reduce structural displacement response. Furthermore, the seismic performance of Masonry Buildings with Frame at the Bottom was studied by equipped the improved damper. The control effect was compared with Masonry Buildings with Frame at the Bottom and Masonry Buildings with Two-story Frame at the Bottom.

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