scholarly journals Performance Evaluation of Q690 High-Strength Concrete-Filled Thin-Walled Steel Tubular Columns under Compression-Bending Coupling

2018 ◽  
Vol 2018 ◽  
pp. 1-12
Author(s):  
Jiantao Wang ◽  
Qing Sun
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Significant Degree ◽  
Economic Benefits ◽  
Assessment Model ◽  
Range Analysis ◽  
Engineering Structures ◽  
Widespread Application ◽  
Strength Concrete ◽  
Thin Walled

The high-strength concrete-filled thin-walled steel tubular (HCFTST) columns, as a relatively new type structure member, could reduce the section size to obtain the favorable architecture aesthetic effects and gain further economic benefits. In this paper, the HCFTST columns were optimized on the basis of the orthogonal array of L16 (45) with three tested parameters. The orthogonal range analysis (ORA) was utilized to research the alteration degree, and the orthogonal variance analysis (OVA) was employed to analyze the significant degree between different parameters. Moreover, the optimized combinations based on performance index including strength, ductility, and energy dissipation were recommended to offer certain reference for structural design and application. Finally, a modified damage assessment model was proposed and verified. It indicates that the HCFTST columns with reasonable design could display favorable performance and can be expected to have a widespread application in engineering structures.

Plastic Hinge Lengths of Normal and High-Strength Concrete in Flexure

2002 ◽  
Vol 4 (4) ◽  
pp. 189-195 ◽  
Author(s):  
P. Mendis
Keyword(s):  
High Strength Concrete ◽  
Strain Softening ◽  
Plastic Hinge ◽  
Full Range ◽  
High Strength ◽  
Upper And Lower Bounds ◽  
Range Analysis ◽  
Strength Concrete ◽  
Plastic Phase ◽  
Flexural Hinges

Full-range analysis methods are becoming popular in design of reinforced concrete structures. These methods require a knowledge of the behaviour of plastic hinges up to advanced curvatures. Concrete sections characteristically soften beyond the plastic phase. To analyse a strain-softening structure, many researchers have used a finite hinge length. In this paper, existing formulae are re-examined and the effects of different variables on hinge length are discussed. Experimentally measured values are compared with the values predicted by using these formulae. It is shown that the upper and lower bounds suggested by the ACI committee 428 provide reliable estimates of hinge lengths for both normal and high-strength concrete flexural hinges up to 80 MPa.

scholarly journals Influence of steel tube thickness and concrete strength on the axial capacity of stub CFST columns

2018 ◽  
Author(s):  
Carmen Ibáñez Usach ◽  
David Hernández-Figueirido ◽  
Ana Piquer Vicent
Keyword(s):  
High Strength Concrete ◽  
Concrete Strength ◽  
High Strength ◽  
Steel Tube ◽  
Experimental Program ◽  
Ultimate Capacity ◽  
Strength Concrete ◽  
Axial Capacity ◽  
Thin Walled ◽  
Cfst Columns

In order to study the mechanical response of concrete-filled steel tubular (CFST) columns, several experimental and theoretical studies have been conducted in the last years. However, the influence of thin-walled steel tubes on the axial capacity of these composite columns is not completely stablished, especially when it is combined with high-strength concrete as infill. In this paper, the results of an experimental campaign on 9 concrete-filled steel tubular stub columns subjected to concentric load are presented. Different cross-section shapes are considered in this campaign, i.e. circular, square and rectangular. The influence of the steel tube wall thickness is analysed by including in the tests specimens with thin-walled tubes, whose behaviour needs to be studied in depth given the issues arising when working under compression. The experimental program is designed so the analysis of the results permits to drawn consistent conclusions. For each series, the steel tube thickness is the only geometric parameter modified in order to properly study its effect. Besides, two different concrete strengths were considered for the concrete infill, i.e. normal and high- strength concrete, to observe their effect on the ultimate capacity of the columns. During the tests, the specimens are subjected to axial load and the evolution of the axial displacement with the load is registered. The ultimate capacity of each specimen is obtained and an analysis of the steel tube thickness and concrete strength influence is accomplished. Finally, the study of the dependency of the failure mode on these parameters is carried out.

Experimental Research and Analysis on the Flexible Behaviors of High-Strength Concrete Thin-Walled Box Girder

2008 ◽  
Vol 400-402 ◽  
pp. 295-300
Author(s):  
Ming Qiao Zhu ◽  
Zhi Fang ◽  
Zhi Wu Yu ◽  
Qi Zhi Wei
Keyword(s):  
Reinforced Concrete ◽  
High Strength Concrete ◽  
Strain Distribution ◽  
Beam Theory ◽  
High Strength ◽  
Reinforced Concrete Beam ◽  
Horizontal Distribution ◽  
Box Girder ◽  
Strength Concrete ◽  
Thin Walled

A full test on the flexible behaviors of the long flanges and trapezoidal section high-strength concrete thin-walled box girder has been performed. The deflection horizontal distribution, strain and strain distribution of concrete and reinforced bars in the compressive flanges, strain distribution along rib height have been studied. The results demonstrate that reinforced concrete thin-walled box girder has fine flexible behavior and ductility, strain distribution along rib height agrees with the basic assume, i.e. Plane section before deforming remain plane, and the destructive experimental results disclosed the full process law of shear lag effect and equivalent calculated coefficient of compressed flange width at middle span section, which can be served as a reference for that applying elementary reinforced concrete beam theory settles the ultimate flexural capacity calculation of concrete thin-walled box girder.

Cyclic testing of Q690 circular high-strength concrete-filled thin-walled steel tubular columns

2018 ◽  
Vol 22 (2) ◽  
pp. 444-458 ◽  
Author(s):  
Jiantao Wang ◽  
Qing Sun
Keyword(s):  
High Strength Concrete ◽  
Low Cycle Fatigue ◽  
High Strength ◽  
Seismic Action ◽  
Cycle Fatigue ◽  
Seismic Behaviour ◽  
Strength Concrete ◽  
Tubular Columns ◽  
Study Results ◽  
Thin Walled

Under seismic action, the severe damage in critical regions of structures could be ascribed to the cumulative damage caused by cyclic loading. This article describes an investigation of the hysteresis behaviour of Q690 circular high-strength concrete-filled thin-walled steel tubular columns with out-of-code diameter-to-thickness ratios. A total of eight specimens were tested under constant axial compression and cyclic lateral loading. The study results of phase I testing consisting of a benchmark test were summarized to examine the seismic behaviour under standard loading, and those of the phase II testing that considered different fatigue loading modes and different concrete strengths were summarized to investigate the low-cycle fatigue behaviour. The load–displacement hysteretic curves, energy dissipation, strength and stiffness degradation were discussed in detail. A simplified method was proposed to predict the low-cycle fatigue life, which can be applied in the damage-based seismic design of circular concrete-filled steel tubular structures.

scholarly journals Thin-walled building structures with improved properties for high-rise construction

2019 ◽  
Vol 265 ◽  
pp. 05004
Author(s):  
Valentina Solovyova ◽  
Makhmud Abu-Khasan ◽  
Dmitry Solovyov
Keyword(s):  
High Strength Concrete ◽  
High Strength ◽  
Silica Sol ◽  
Housing Construction ◽  
Building Structures ◽  
Cesium Nitrate ◽  
Strength Concrete ◽  
High Rise ◽  
High Efficient ◽  
Thin Walled

A high-efficient complex reactive composition consisting of a polycarboxylate polymer, cesium nitrate (CsNO3) and silica sol was developed for cast-in-place housing construction from high-strength concrete. The use of this composition provides production of high-strength concrete with increased crack resistance.

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