توضیحات
ABSTRACT
In this paper, the behavior of welded angle connections is studied at elevated temperatures using ABAQUS finite element software. In this study, steel members and connection components are considered to behave nonlinearly; the degradation of steel properties with increasing temperature is considered according to EC3 recommendations. The results of finite element and experimental tests conducted on welded angle connections in furnace fire conditions are compared, and the obtained failure modes and moment-rotation-temperature characteristics are in good agreement with those associated with experimental tests. Temperature loading similar to real fire condition is applied to each specimen to study the behavior of these connections in fire condition and the stiffness change with temperature increase under real fire condition is studied. The numerical results show that, in addition to material properties and connection geometry, the applied moments and temperature have significant effects on the stiffness of this kind of steel connection.
INTRODUCTION
The temperature sensitivity of steel is a weakness in steel structures. Since the mechanical properties of steel significantly deteriorate at high temperatures, the load capacity of steel structures under condition of a structural fire will decrease intensively. The failure of beam-column joints frequently induces the collapse of steel structures. However, the behavior of steel beam-column connections at elevated temperatures is very complicated and has not been fully studied. Different methods, including finite element analysis, are used to study the behavior of steel beam-column connections at elevated temperatures. The finite element method (FEM) provides an attractive means to investigate the beam-column joints in more detail than experimental tests would usually allow. A number of 3-D FE models have been developed (by various authors) that take into account any geometrical and material nonlinearities. Several studies have focused on the influence of elevated temperatures on end-plate connection behavior; a brief description of some of this research follows. Liu was the first to attempt to use FEM in modeling connection behavior at elevated temperatures. He developed a finite element model (FEAST) to predict the behavior of different types of joints at elevated temperatures. The beam, column, end plate and stiffeners were modeled using eight-nodded shell elements and considered the nonlinear behavior of the material with nonuniform thermal expansion across a section as well as large deformations in fire.
Year: 2011
Publisher : Sixth National Congress on Civil Engineering
By : Amir Saedi Daryan , Mahmoud Yahyai
File Information: English Language/ 8 Page / size: 185 KB
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سال : 1390
ناشر :ششمین کنـگره ملی مهنـدسی عمـران
کاری از :امیر سعیدی داریان، محمود یحیی
اطلاعات فایل : زبان انگلیسی / 8 صفحه / حجم : KB 185
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