International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
www.irjet.net
SHEAR RESPONSE OF DUAL STEEL COMBINED COMPOSITE COLUMNS IN NON PRISMATIC CONDITION Abhina Meenu M.N.1, Nikhil R.2 1Student,Dept.of civil Engineering, Universal Engineering College, Vallivattom, Kerala, India
2Assistant Professor, Dept. of Civil Engineering, Universal Engineering College, Vallivattom, Kerala, India
---------------------------------------------------------------------***--------------------------------------------------------------------Abstract - Concrete-filled double-skin steel tube (CFDST) is a composite structure, in which concrete fills the gap between the
inner and outer steel tubes. It was firstly guided as a new form of construction for deep water vessel to resist external pressure. Compared with the solid concrete-filled steel tube (CFST), CFDST is featured by its large bending stiffness, light weight, and good fire resistance. With the great prospect for engineering applications, CFDST is suitable to be used as the construction of bridge piers, power transmission towers, offshore platforms, and super high-rise buildings. As the CFDST members frequently used, researchers found that in some cases, for example during the earthquakes, the liquefaction and lateral spreading of soils caused by earthquakes may lead to extremely high shear force on drilled-shaft foundations. Moreover, with the occurrence of impact accidents or earthquake, the bottom columns of structures, such as the piers of bridge and columns of building, will be inevitably endure significant shear force, making them prone to suffer shear failure. This project attends to analyse the shear response of CFDST of various cross sections in primatic and non-prismatic conditions. A total of thirty-five specimens had tested to investigate and compare the shear response. The influence of shear span ratio, hollow ratio, type of cross section, dimensions of columns were studied. Numerical modelling of CFDST columns are doing in finite element modelling software ANSYS Workbench. Key Words: CFDST, shear span ratio, mechanical performance, material properties, sustainability.
1. INTRODUCTION Concrete-filled double-skin steel tube (CFDST) is a composite structure, in which concrete fills the gap between the internal and outer steel tubes. It was firstly guided as a new form of construction for deep water vessel to resist external pressure. Compared with the solid concrete-filled steel tube (CFST), CFDST is featured by its large bending stiffness, increase in section modulus, enhancement in stability, better damping characteristics, better cyclic performane, light weight, and good fire resistance. With the great prospect for engineering applications, CFDST is suitable to be used as the construction of bridge piers, power transmission towers, offshore platforms and super high-rise buildings. CFDST commonly is used and have different outer shapes e.g., circular-in-circular, circular-in-square, and square-in-square according to structural type and function. For instance, specimens with outer circular section are widely used in the construction of bridge piers or power transmission towers because of the strong confinement effect that outer circular steel provided while outer square section of specimens is commonly adopted in the high-rise buildings construction owing to its easy for beam-column joint connection.
2. PROPERTIES OF SECTIONS Table -1: Dimensional Properties of Sections
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Specimen
Outer Steel Tube (mm)
Inner Steel Tube (mm)
Thickness (mm)
SC
200X200
160
4
CS
225.73
141.76X141.76
4
SS
200X200
141.76X141.76
4
CC
225.73
160
4
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