Global critical load ratio

AbstractIn this paper, the dynamic buckling of an elastic cylindrical shell subjected to an axial impact load is analyzed in Hamiltonian system. By employing a symplectic method, the traditional governing equations are transformed into Hamiltonian canonical equations in dual variables. In this system, the critical load and buckling mode are reduced to solving symplectic eigenvalues and eigensolutions respectively. The result shows that the critical load relates with boundary conditions, thickness of the shell and radial inertia force. And the corresponding buckling modes present some local shapes. Besides, the process of dynamic buckling is related to the stress wave, the critical load and buckling mode depend upon the impacted time. This paper gives analytically and numerically some new rules of the buckling problem, which is useful for designing shell structures.

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A proposed procedure for expressing the behavior of a full engine cycle by identifying its critical load timings

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/161/1/012071 ◽

2016 ◽

Vol 161 ◽

pp. 012071

Author(s):

Mihalache Marius Andrei ◽

Nagit Gheorghe ◽

Musca Gavril ◽

Merticaru Vasile ◽

Ripanu Marius Ionut

Keyword(s):

Critical Load ◽

Engine Cycle

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Research on seismic behavior of special-shaped CFST column to H-section steel beam joint

Advances in Structural Engineering ◽

10.1177/13694332211007392 ◽

2021 ◽

pp. 136943322110073

Author(s):

Yu Cheng ◽

Yuanlong Yang ◽

Binyang Li ◽

Jiepeng Liu

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Seismic Behavior ◽

Failure Modes ◽

Joint Stiffness ◽

Load Ratio ◽

Element Model ◽

Steel Tube ◽

Steel Beam ◽

Static Test

To investigate the seismic behavior of joint between special-shaped concrete-filled steel tubular (CFST) column and H-section steel beam, a pseudo-static test was carried out on five specimens with scale ratio of 1:2. The investigated factors include stiffening types of steel tube (multi-cell and tensile bar) and connection types (exterior diaphragm and vertical rib). The failure modes, hysteresis curves, skeleton curves, stress distribution, and joint shear deformation of specimens were analyzed to investigate the seismic behaviors of joints. The test results showed the connections of exterior diaphragm and vertical rib have good seismic behavior and can be identified as rigid joint in the frames with bracing system according to Eurocode 3. The joint of special-shaped column with tensile bars have better seismic performance by using through vertical rib connection. Furthermore, a finite element model was established and a parametric analysis with the finite element model was conducted to investigate the influences of following parameters on the joint stiffness: width-to-thickness ratio of column steel tube, beam-to-column linear stiffness ratio, vertical rib dimensions, and axial load ratio of column. Lastly, preliminary design suggestions were proposed.

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