concrete filled steel tube
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2022 ◽  
Vol 190 ◽  
pp. 107089
Author(s):  
Qihan Shen ◽  
Fengqin Wang ◽  
Jingfeng Wang ◽  
Xianfeng Ma

2022 ◽  
Vol 2022 ◽  
pp. 1-21
Author(s):  
Jing Ji ◽  
Chenyu Yu ◽  
Liangqin Jiang ◽  
Jiedong Zhan ◽  
Hongguo Ren ◽  
...  

In order to investigate the bearing capacity of H-shaped honeycombed steel web composite columns with rectangular concrete-filled steel tube flanges (STHCCs) subjected to eccentrical compression load, 33 full-scale STHCCs were designed with the eccentricity(e), the slenderness ratio (λ), the cubic compressive strength of concrete(fcuk), the thickness of the steel tube flange (t1), the thickness of honeycombed steel web (t2), diameter-depth ratio (d/hw), space-depth (s/hw), and the yield strength of the steel tube (fy) as the main parameters. Considering the nonlinear constitutive model of concrete and simplified constitutive model of steel, the finite element (FE) model of STHCCs was established by ABAQUS software. By comparison with the existing test results, the rationality of the constitutive model of materials and FE modeling was verified. The numerical simulation of 33 full-scale STHCCs was conducted, and the influence of different parameters on the ultimate eccentrical compression bearing capacity was discussed. The results show that the cross-sectional stress distribution basically conforms to the plane-section assumption. With the increase in e, λ, and d/hw, the ultimate eccentrical compression bearing capacity of the full-scale STHCCs decreases, whereas it gradually increases with the increase in fcuk, t1, t2, s/hw, and fy. By introducing bias-stress stability coefficient (φ), the calculation formula of full-scale STHCCs under eccentrical compression is proposed by statistical regression, which can lay a foundation for the popularization and application of these types of composite columns in practical engineering.


2022 ◽  
pp. 136943322110542
Author(s):  
XiuShu Qu ◽  
Yuxiang Deng ◽  
GuoJun Sun ◽  
Qingwen Liu ◽  
Qi Liu

The use of a self-compacting lower expansion concrete in a concrete-filled steel tube (CFST) structure not only promotes the quality of concrete pouring but also improves the bond behaviour between the steel and the concrete. In combination with the actual stress state of the columns in the engineering structure, it is necessary to study the eccentric compression behaviour of the column. In this study, experimental studies involving both uniaxial and biaxial bending tests of rectangular self-compacting lower expansion CFST columns were carried out. The variation laws of the load–displacement curves, the lateral deflection curves and the stress–strain curves during the loading phase were analysed. Furthermore, the failure modes and the mechanical properties of the specimens under eccentric compression loads were investigated. Subsequently, the numerical models of CFST columns with self-compacting lower expansion concrete were considered and established. In order to verify the rationality of the finite element modelling, the numerical calculation results were compared with test results. Then, a parametric analysis of the compression and the bending bearing capacities of each column was carried out by changing the eccentricity of the load, and the N–M curves or N-Mx-My surfaces describing the ultimate bearing capacity of the column were obtained. Finally, by the parametric finite element analysis of the rectangular CFST columns regarding to the bearing capacity under the same eccentricity, a conclusion was obtained: when the expansion agent content γ of a specimen increased from 0% to 10%, the bearing capacity of the columns increases significantly, but when continue increasing the expansive agent content, the expansion agent content has little effect on the compression–bending bearing capacity.


Author(s):  
Matheus Fernandes ◽  
Silvana De Nardin ◽  
Fernando Menezes de Almeida Filho

abstract: In this paper, a computational code was developed to obtain M-N interaction curves for rectangular concrete-filled steel tube columns considering the strain compatibility in the cross-section. Considering the composite section subjected to uniaxial bending moments, expressions were developed to determine normal force, moment resistance, neutral axis depth and components resistance of cross-section. Such expressions were implemented in a computational tool developed to the authors and that allows to obtain the M-N pairs of strength. The steel and concrete ultimate strains were defined with the aid of the Brazilian standard for reinforced concrete structures ABNT NBR 6118. The obtained results were compared to simplified curves defined according to the theoretical models of ABNT NBR 8800, ABNT NBR 16239, EN 1994-1-1 and literature data. The proposed model showed good agreement with literature results and had good precision to estimate the ultimate moment values. To further understand the resistance of composite columns under uniaxial bending moments, parametric study was performed to evaluate the influence of the compressive strength of concrete, yielding strength of steel and steel area ratio on M-N interaction curves. The results indicate that the yielding strength of steel and the steel area ratio were the variables that most influenced the values of composite columns resistance (normal force and bending moment).


2021 ◽  
Vol 11 (2) ◽  
pp. 77-81
Author(s):  
Wanda Yovita

Concrete Filled Steel Tube (CFST) adalah pipa besi yang diisi dengan beton dan merupakan salah satu material alternatif untuk struktur bangunan sederhana. Disaat penggunaan baja Wide Flange (WF) dirasa melewati anggaran yang dibatasi oleh pemilik bangunan maka penggunaan kolom CFST bisa dijadikan pilihan. Pada pembangunan sebuah rumah tinggal dua lantai di daerah Bandung, pemilik bangunan dan kontraktor memutuskan untuk menggunakan material alternatif ini untuk mengurangi biaya konstrusi yang dibutuhkan. Kolom lantai dua dari bangunan ini menggunakan CFST sedangkan lantai dasar menggunakan baja Wide Flange (WF). Penelitian ini bertujuan untuk mengamati proses dilakukannya eksperimen penerapan kolom CFST pada bangunan rumah tinggal dua lantai tersebut. Keputusan membangun menggunakan kombinasi material ini telah dilakukan setelah melalui diskusi oleh pemilik, arsitek dan kontraktor. Penerapan kolom CFST pada bangunan rumah tinggal ini dilakukan dengan material pipa besi kotak ber SNI denan ukuran 10 cm x 10 cm dengan ketinggian 3 meter. Pengisian beton di dalam besi dilakukan dengan memadatkan campuran semen K225 dengan material konstruksi terbaik yang ada di wilayah pembangunan. Modul struktur yang digunakan adalah 3 m x 3 m dengan metode konstrusi menggunakan teknik sederhana yaitu menyambung kedua material dengan plat dan sambungan pengelasan. Plat baja yang digunakan berukuran 15x30 cm juga diberi angkur berukuran sama. Pekerjaan kolom CFST ini tidak memerlukan bekisting sehingga dapat menghemat waktu dan tenaga kerja. Pada tahap finishing arsitektural  pekerjaan juga menjadi lebih mudah karena dimensi kolom CFST berukuran sama dengan batu bata dinding pengisi.   Hasil penelitian menunjukkan penerapan kolom CFST pada rumah tinggal ini terbukti dapat dilaksanakan lebih cepat dan murah dibandingkan penggunaan material bangunan rumah tinggal konvensional.


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