scholarly journals Seismic Damage Behavior of Aeolian Sand Concrete Columns with an Inner Square Steel Tube

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yaohong Wang ◽  
Zeping Zhang ◽  
Qing Han ◽  
Qi Chu ◽  
Xiaoyan Ma
Keyword(s):  
Damage Model ◽  
Concrete Columns ◽  
Seismic Damage ◽  
Steel Tube ◽  
Aeolian Sand ◽  
Loading Test ◽  
Damage Behavior ◽  
Damage Indices ◽  
Study Results ◽  
Square Steel Tube

In order to promote the application of aeolian sand in steel-concrete composite structures, the aeolian sand concrete columns with an inner square steel tube is proposed in this paper. This kind of column is composed of aeolian sand concrete, reinforcing steel, and an inner square steel tube. The seismic damage behavior of the column was studied through cyclic loading test and damage analysis on seven specimens with different structural forms. The seismic damage indices of the specimens in this study include the failure mode, bearing capacity, ductility, stiffness, hysteresis behavior, and energy dissipation. Then, a damage model of this kind of column is proposed. The study results show that installing an inner square steel tube can significantly improve the seismic damage behavior of aeolian sand concrete columns. This mode of construction can be used to enhance the replacement percentage of aeolian sand. In addition, the damage model proposed in this paper agrees well with the experimental results and can be used to evaluate the damage degree of the aeolian sand concrete columns with an inner square steel tube.

scholarly journals Experimental study on the seismic damage behavior of aeolian sand concrete columns

2020 ◽  
Vol 19 (2) ◽  
pp. 138-150
Author(s):  
Yaohong Wang ◽  
Qi Chu ◽  
Qing Han ◽  
Zeping Zhang ◽  
Xiaoyan Ma
Keyword(s):  
Experimental Study ◽  
Concrete Columns ◽  
Seismic Damage ◽  
Aeolian Sand ◽  
Damage Behavior

scholarly journals Local Damage Indices of Frames Consisting of Composite Beams and RC Columns

2016 ◽  
Vol 10 (1) ◽  
pp. 280-292
Author(s):  
Wei Li ◽  
Linzhu Sun ◽  
Kejia Yang ◽  
Lei Wang ◽  
Dongyan Wu ◽  
...  
Keyword(s):  
Composite Structures ◽  
Damage Model ◽  
Damage Index ◽  
High Strength ◽  
Steel Beams ◽  
Local Damage ◽  
Composite Frame ◽  
Damage Indices ◽  
Study Results ◽  
Scope Of Application

The study is to propose the local damage indices of composite frame structures consisting of high-strength concrete columns confined by continuous compound spiral ties and steel beams (CCSTRCS), the local damage indices would lay a foundation for the study of the overall damage indices for composite CCSTRCS frame. The Mehanny damage model has been modified to predict the local damage behavior of composite CCSTRCS frames, it enlarges the scope of application for the composite structures compared with the previous work. The proposed model is validated by comparing with the present references. The study results suggest the different components corresponding to the extent of the damage and its damage index.

scholarly journals EXPERIMENTAL STUDY ON THE SEISMIC DAMAGE OF AEOLIAN SAND CONCRETE COLUMNS WITH DIFFERENT REINFORCEMENTS

2020 ◽  
Vol 29 (2) ◽  
pp. 204-218
Author(s):  
Yaohong Wang ◽  
Xiaoyan Ma ◽  
Qing Han ◽  
Qi Chu ◽  
Zeping Zhang
Keyword(s):  
Experimental Study ◽  
Concrete Columns ◽  
Seismic Damage ◽  
Aeolian Sand

Seismic Damage Analysis on Double-Column Pier of Passenger Dedicated Line

2011 ◽  
Vol 243-249 ◽  
pp. 1508-1511
Author(s):  
Yu Li ◽  
Xi Zhu ◽  
Qing Shan Yang
Keyword(s):  
Damage Model ◽  
Damage Index ◽  
Seismic Damage ◽  
Response Analysis ◽  
Damage Analysis ◽  
Nonlinear Seismic Response ◽  
Fea Model ◽  
Seismic Motion ◽  
Study Results ◽  
Passenger Dedicated Line

Reasonable strong seismic motion records are selected according to the applicable Code of Seismic Design for Railway Engineering. By using FEA software, the FEA model of one double-column pier of passenger dedicated line is established with considering the effect of flexible base effects and seismic characteristic. Based on Park-Ang seismic damage model and nonlinear seismic response analysis, the seismic damage analysis on double-column pier of passenger dedicated Line is carried out. The study results are obtained as follow: 1) The seismic damage of bridge mainly happen during the early and middle stage of seismic motion. 2) There are still major discrepancies in the seismic damage made from the seismic records which come from the same site condition and have the same PGA. 3) Although PGA has a great effect on the seismic damage index, it has nothing to do with the happening time of max seismic damage index.

Cumulative Seismic Damage of Reinforced Concrete Columns: Variable Amplitude Tests

2011 ◽  
Vol 52-54 ◽  
pp. 740-744
Author(s):  
Guo Hua Xing ◽  
Yuan Pan ◽  
Guo Fu ◽  
Jian Ling Hou
Keyword(s):  
Reinforced Concrete ◽  
Phase I ◽  
Low Cycle Fatigue ◽  
Damage Model ◽  
Concrete Columns ◽  
Seismic Damage ◽  
Cycle Fatigue ◽  
Constant Amplitude ◽  
Reinforced Concrete Columns ◽  
Variable Amplitude

The findings from an experimental study to investigate cumulative seismic damage in reinforced concrete columns are presented. Fourteen identical half-scale concrete columns were fabricated and tested to failure. Results from Phase I testing, which included constant amplitude tests to determine the low-cycle fatigue characteristics of the rectangular concrete column, were presented in a companion paper. This paper summarizes results of variable amplitude tests. The imposed displacement histories were obtained from analytical simulations of the model column subjected to a series of earthquakes. Test observations indicate that failure is generally initiated by confinement inadequacy and the rupture of the transverse hoop reinforcement. The tests also demonstrated the potential for low-cycle fatigue fracture of the main longitudinal steel when the specimen was subjected to relatively larger displacement amplitudes. A fatigue-based damage model, derived from the constant-amplitude tests completed in Phase I testing, was applied to the observed response of the three specimens tested in this phase. Findings from the study indicate that the energy capacity of members is ductility-dependent and that fatigue-based damage models offer a reliable means of assessing seismic structural performance.

Numerical Model of Cold Press-Formed Square Steel Tube Columns Considered with Degradation Behavior due to Local Buckling and/or Fracture

2018 ◽  
Vol 763 ◽  
pp. 533-540
Author(s):  
Yuji Koetaka ◽  
Koichi Taniguchi ◽  
Iathong Chan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Numerical Model ◽  
Local Buckling ◽  
Steel Tube ◽  
Degradation Behavior ◽  
Loading Test ◽  
Element Analysis ◽  
Cold Press ◽  
Square Steel Tube

In steel building structures, local buckling and/or fracture of columns could occur during strong ground motions, furthermore complete collapse might be induced due to the column strength degradation. In this paper, cold press-formed square tube columns are targeted, and numerical model being able to trace precisely degradation behavior is proposed. In order to take account of both local buckling and fracture with low computational costs, multi-spring model which consists of some uni-axial springs is adopted. Axial force-deformation relationships of uni-axial springs are provided on flat area and corner area of square tube severally, and are separated into skeleton part and hysteresis part. All parameters on force-deformation relationship are identified based on finite element analysis results of short columns under monotonic or cyclic axial loading. Comparing between analysis results by multi-spring models and past cyclic loading test results or finite element analysis results, it is clarified that degradation behavior of cold press-formed square steel tube columns can be traced with high accuracy.

scholarly journals Experimental Study on CFRP-Confined Circularized Concrete-Filled Square Steel Tube Short Columns

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Yuchuan Wen ◽  
Zhongjun Hu ◽  
Anningjing Li ◽  
Quanheng Li ◽  
Xuepeng Li ◽  
...  
Keyword(s):  
Concrete Strength ◽  
Concrete Columns ◽  
Steel Tube ◽  
Confined Concrete ◽  
Test Results ◽  
Stress Strain ◽  
Short Columns ◽  
Reinforced Polymer ◽  
Square Steel Tube ◽  
Strain Model

This study investigates the suitability of the circularization technique for strengthening square concrete-filled square steel tube (CFSST) short columns. A total of 16 specimens were tested under axial compression. The main parameters under investigation were concrete strength, the thickness of arc cement mortar layer components (CAM), and the layers of carbon fiber-reinforced polymer (CFRP) sheets. Test results indicated that the failure mode of CFRP-confined circularized CFSST (C-C-CFSST) columns was similar to that of CFRP-confined concrete columns. The CFRP-confined circularized strengthening method can increase confinement efficacy and reduce the stress concentration at the corners of CFSST columns. Three existing CFRP-confined concrete stress-strain models were evaluated using the test results. The predictions of the Lam and Teng stress-strain model agree well with the test data.

scholarly journals Seismic Damage Model of High-Strength Reinforced Concrete Frame Columns

2021 ◽  
Vol 237 ◽  
pp. 03025
Author(s):  
Guojun Zhang
Keyword(s):  
Damage Model ◽  
Damage Index ◽  
High Strength ◽  
Concrete Columns ◽  
Seismic Damage ◽  
Strength Concrete ◽  
Concrete Frame ◽  
Damage Models ◽  
Axial Compression Ratio ◽  
History Of

In this paper, several existing seismic damage models as well as their characteristics were discussed first of all. And then it was figured out that variational history of incremental dissipated hysteretic energy of tentative frame columns under different loading cycle levels; the influence of axial compression ratio, type of stirrups, stirrup ratio, reinforcement ratio, strength grade of concrete and shear span ration on the incremental dissipated hysteretic energy was discussed and analysed. The damage index of tentative frame columns was compared and analysed according to the existing seismic damage models, and the seismic damage models adapt to high-strength concrete columns and ordinary-strength concrete columns were offered. The influence of shear span ration, axial compression ratio and stirrup ratio on the damage was discussed and analysed according to the variational history of the damage index under different loading cycle levels. Lastly through analysing all sorts of seismic damage models comparatively, the seismic damage model of high strength concrete frame columns is put forward, which offers good basement for further damage analysis.

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