基于板—梁理論的鋼管混凝土翼緣工字形梁組合扭轉(zhuǎn)與彎扭屈曲理論研究
[Abstract]:For the modern society, the building structure is gradually developing towards the direction of long span and large height. Concrete filled steel tube composite structure is widely used and has a good prospect of development. Concrete-filled steel tube (CFST) flange I-shaped beam is a new type of composite member. Its section has higher bending stiffness and torsional stiffness, which can improve the strength and out-of-plane stability of the member. In addition, the existence of CFST flange reduces the height of web to a certain extent, and the thickness of web is small, so it is advantageous to resist shear. Concrete-filled steel tube (CFST) flange I-shaped beams are composed of two different materials, steel and concrete, which can be regarded as the combination of open, closed and solid components, which makes the related theoretical research more complicated. And the existing theoretical formula can not be applied. At present, the theoretical study on composite torsion and bending and torsional buckling of concrete-filled steel tube flange I-shaped beams is rarely seen, and solving the torsional problem is the necessary prerequisite to solve the bending and torsional buckling problem. Based on the theory of slab-beam put forward by Professor Zhang Wenfu, and starting with the problem of free torsion of concrete filled steel tube (CFST) members, this paper makes a theoretical study on the combined torsion and bending and torsional buckling of concrete filled steel tubular (CFST) flange I-shaped beams with biaxial and uniaxial symmetry. The finite element method is used to verify the correctness of the theoretical derivation. The main contents of this paper are as follows: (1) based on the slab-beam theory, the free torsion problem of concrete-filled steel tubular beams is theoretically analyzed, and the expressions of the total potential energy and the free torsional stiffness of square and rectangular concrete-filled steel tubular beams are given. The finite element model of square and rectangular concrete-filled steel tube cantilever beams is established by using ANSYS software. The torsion angle of free end is extracted and compared with the theory to verify the correctness of theoretical derivation and free torsional stiffness. (2) based on slab-beam theory, The combined torsion problem of concrete-filled steel tubular (CFST) flange I-shaped beams is theoretically analyzed. The expressions of total potential energy, free torsional stiffness and restrained torsional stiffness of uniaxial and uniaxial symmetric I-shaped beams with concrete filled steel tube flange are given. The energy variational model and differential equation model are established, and the analytical solution of torsion angle is given. The finite element models of biaxial and uniaxial symmetrical steel tube concrete flange I-shaped cantilever beams are established by using ANSYS software. The torsion angle of free end is extracted and compared with the theory. The theoretical derivation and the correctness of free torsional stiffness and restrained torsional stiffness are verified. (3) based on the slab-beam theory, the bending and torsional buckling of concrete-filled steel tubular flange I-shaped beams is theoretically analyzed, and the biaxial analysis is given. The expressions of total strain energy, total initial stress potential energy and total potential energy during bending and torsional buckling of uniaxial symmetrical steel tube concrete filled steel tube flange I-shaped beams are given. At the same time, the energy variational model and differential equation model are established. (4) based on the total potential energy expression of bending and torsional buckling of concrete-filled steel tube flange I-shaped beams, the load distribution of simply supported beams in pure bending and uniform distribution is given. The calculation formula of critical bending moment of elastic bending and torsional buckling under concentrated load in span is established by using ANSYS software. The finite element model of biaxial and uniaxial symmetric steel tube concrete flange I-shaped beams is established to analyze the eigenvalue buckling of 12 I-shaped beams. The correctness of the critical moment formula is verified.
【學(xué)位授予單位】:東北石油大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU398.9
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