Cyclic behavior of thin-walled square steel tubular columns filled with demolished concrete lumps and fresh concrete

2012 ◽  
Vol 77 ◽  
pp. 69-81 ◽  
Author(s):  
Bo Wu ◽  
Xin-Yu Zhao ◽  
Jin-Suo Zhang
Keyword(s):  
Fresh Concrete ◽  
Cyclic Behavior ◽  
Tubular Columns ◽  
Thin Walled

scholarly journals Fresh concrete consistency effect on thin-walled columns creep phenomenon

2018 ◽  
Vol 11 (3) ◽  
pp. 644-651 ◽  
Author(s):  
E. L. MADUREIRA ◽  
L. A. PAIVA
Keyword(s):  
Reinforced Concrete ◽  
Fresh Concrete ◽  
Memory Storage ◽  
Sustained Load ◽  
Physical Parameters ◽  
Integral Calculus ◽  
Yielding Condition ◽  
Material Creep ◽  
Thin Walled ◽  
State Models

Abstract A concrete structural member when kept under sustained load presents progressive strains over time, associated to the material creep. The fresh concrete consistency, specially, exerts some effect on that phenomenon. The pioneering formulations developed to modelling the creep of concrete are applicable, directly, to the cases for which the stress magnitude remains constant. Its application to reinforced concrete structural members, that exhibits changes in the magnitude of the stresses over such a time dependent phenomenon, requires simplifications from which result the memory models, whose implementation presents the disadvantage of involving the history of the stresses storage. The State Models were developed to overcome these difficulties, as they result of integral calculus scheme improvement, dispensing such computational memory storage. The subject of this work is the analysis of creep strains on reinforced concrete thin-walled columns, emphasizing the fresh concrete consistency efecct, on the base of a state model, fixing the values of its physical parameters from the NBR 6118/14 proceedings [1]. The obtained results showed the occurrence of stresses transfer from the mass of the concrete to the reinforcement steel bars, that was more pronounced in those cases for which the slump test abatement were the highest and, in some cases, including, it induced the material yielding condition.

scholarly journals NUMERICAL INVESTIGATION ON CYCLIC BEHAVIOR OF RING-BEAM CONNECTION TO GANGUE CONCRETE FILLED STEEL TUBULAR COLUMNS

2021 ◽  
Keyword(s):  
Cyclic Loading ◽  
Failure Modes ◽  
High Capacity ◽  
High Strength ◽  
Experimental Tests ◽  
Load Level ◽  
Cyclic Behavior ◽  
Tubular Columns ◽  
Earthquake Resistant ◽  
Parametric Studies

As a promising composite structure, gangue concrete filled steel tubular (GCFST) column exhibites favarable characteristics including high strength and economic efficiency. This paper conducted numerical investiagations on structural behavior of a ring-beam connection to GCFST column with concrete beam under cyclic loading. Furthermore, finite element models of column-beam connections were developed using ABAQUS and validated against full-scale experimental tests to identify accuracy of selected modeling approaches. Using these validated models, stress distribution of each component was examined to study the force-transferring mechanism among the components and failure modes of the ring-beam connection. Research study indicated that the ring-beam connection showed a reasonable force-transferring mechanism under cyclic loading and the remarkable earthquake-resistant performance with high capacity and acceptable ductility. Finally, parametric studies were performed to assess the influences of beam-to-column stiffness ratio,steel ratio, axial load level, and concrete compressive strength on connection cyclic behaviors. Parametric studies provided some suggestions and references for the application of the ring-beam connection in various engineering projects.

THIN-WALLED STEEL TUBULAR COLUMNS WITH UNIFORM AND GRADED THICKNESS UNDER CYCLIC LOADING

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Qusay Al-Kaseasebh ◽  
Iraj H.P Mamaghani
Keyword(s):  
Local Buckling ◽  
Element Model ◽  
Lateral Loading ◽  
Steel Columns ◽  
Tubular Columns ◽  
Aesthetic Appearance ◽  
Significant Strength ◽  
Global Buckling ◽  
Thin Walled ◽  
Graded Thickness

Thin-walled steel tubular circular columns are widely used as cantilever bridge piers due to their geometric efficiency, aesthetic appearance, and high earthquake resistance. However, local buckling, global buckling, or interaction between both is usually the main reason of significant strength and ductility loss in these columns, which eventually leads to their collapse. This paper investigates the behavior of uniform circular (C) and graded-thickness circular (GC) thin-walled steel tubular columns under constant axial and cyclic lateral loading. The GC column with size and volume of material equivalent to the C column is introduced and analyzed under constant axial and cyclic lateral loading. The analysis carried out using a finite-element model (FEM), which considers both material and geometric nonlinearities. The accuracy of the employed FEM is validated based on the experimental results available in the literature. The results revealed that, significant improvements in strength, ductility, and post-buckling behavior of thin-walled steel columns obtained using the GC column.

Numerical analysis on seismic behaviors of T-shaped concrete-filled steel tubular columns with reinforcement stiffeners

2017 ◽  
Vol 21 (9) ◽  
pp. 1273-1287 ◽  
Author(s):  
Jiepeng Liu ◽  
Yuanlong Yang ◽  
Hua Song ◽  
Yuyin Wang
Keyword(s):  
Numerical Analysis ◽  
Numerical Model ◽  
Local Buckling ◽  
Compressive Load ◽  
Steel Tube ◽  
Cyclic Behavior ◽  
Engineering Practice ◽  
Force Model ◽  
Restoring Force ◽  
Tubular Columns

A numerical analysis based on previous experiment has been carried out on T-shaped concrete-filled steel tubular columns subjected to constant axial compressive load and cyclic lateral loads. Tensile bar stiffeners were introduced to be welded on inside surfaces of steel tube to postpone its local buckling and to enhance the confinement of steel tube for concrete. A modified fiber-based method was developed to establish numerical modeling program of specimens’ cyclic behavior, incorporating the effect of stiffeners on postponing steel tube’s local buckling and the confinement for concrete. The reciprocating movement of inflection point along frame column is also considered in the numerical program. A simplified arc-length method was employed as iterative control algorithm of the numerical model. Horizontal load–displacement hysteretic curves of specimens were calculated with the numerical model and verified with test results. A restoring force model based on experimental investigation was proposed as simplified method for engineering practice.

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