Applied Mechanics and Materials Vols. 578-579

Abstract: Recent years there have been observed a wide application of a metalware in industrial and civil engineering. Special place in the building industry is belonged to light steel thin-walled constructions having a lot of technological advantages. In the article the first development cycle of a numerical method creating is considered – creating of the stiffness matrixes of thin-walled finite elements of various types using the semisheared theory (by V.I.Slivker) – depending on a way of approximation of functions of deformations (torsion and warping): 1. Linear approximation of torsional functions with a 2-central finite element having 4 transitions; 2. Quadratic approximation of torsional functions and linear approximation of warping function with a 3-central finite element having 5 transitions; 3. Cubical approximation of functions of torsional and warping functions with a 3-central finite element having 6 transitions. Thus deformation functions (torsional angle and warping) are approximated as mutually independent functions.

Abstract: "Strong column weak beam" form of frame structure is widely considered to be a reasonable framework structure yield mechanism in the seismic damage. The current structure design is mostly on the basis of that yield mechanism for structural seismic design. Generally the structural engineers ignore the bearing capacity contribution of frame beams that comes from the slab in the seismic design. The structure engineers considered the slab as a rigid component and simply calculate the slab stiffness by magnification factor method, which ignores the core of the problem. This paper analyzes mainly the influence of the destruction of slab form frame structure , studying further how slab affect the yield mechanism of frame structure, and explores the destruction form of difference between two models after analyzing two structure models by the method of Push – over. It shows that the existence of slab make the yield mechanism of RC frame structures different from the design.

Abstract: Based on the principle of minimum potential energy, choosing warping displacement function of parabolic displacement mode, using energy variational method to deduce Box beam shear lag effect analysis of differential equation to obtain shear lag warping stress. Through the calculation of simply supported box girder model and the analyse of the stress of Wide cantilever plate, box girder roof and box girder floor Assume a new warping displacement function. Through the analysis of measured results proved the rationality of this article assumes and research value.

Abstract: most crane damage identification of the work has focused on the static analysis, that can't explain whether the crane has a damage or not by this way. So the paper explained the modal signal to analysis this problem , Used 300 tons gantry crane’s beam for background and ANSYS software as a tool was used for numerical simulation. The purpose is to find difference between the damage beam of the crane and health one,because if there was a damage on the beam , the formations and frequency will be changed. This theory of analysis is based on the vibration equation. In order to illustrate it better, the wavelet analysis method as a tool has been used ,in this case the signal was filtered, we can judge the damage location from the three dimensional curve. The basic aim of this paper is to arrive at a better way to judge the damage.Through the above analysis, the results proved the author's idea, identify structural’s damage basically, but it still need further research.

Abstract: The dynamic analysis method and theory of double-tower connected structures is discussed in this paper .Then modal analysis、static and dynamic time-history analysis is researched with the FEM software ANSYS. Through the structure of monomer and comparative study of the structure in different locations, the basic rules of dynamic characteristics and the rules of layout corridor can be achieved. In addition, by symmetric and asymmetric conjoined comparative study, the basic choose rules of structure type can also be achieved.

Abstract: According to the actual structure, the ABAQUS finite element models of grouting-sleeve reinforcement-connection component with different sleeve-rib space were established, and the mechanical performance of component under the action of axial tension load was studied. Meanwhile, the stress distributions among sleeve with six kinds of sleeve-rib space by means of stress nephogram were obtained. Numerical simulation result shows that with the sleeve-rib space decreasing from 56mm to 8mm, the constraint capability of grouting material on reinforcement is better and better, and the internal force distribution in sleeve tends to be more homogeneous.

Abstract: By means of ANSYS finite element software, the numerical model of ductile cast iron buried pipeline with flexible joint was established, and the entire model was comprised of pipeline and its exterior massive soil for simulating the coupling-interaction between soil and pipeline. Meanwhile, the multi-point excitation method was adopted for considering the wave-passage effect. According to EI-centro seismic wave record corresponding to III site, the stress-time-history curve of pipeline body and the displacement-time-history curve of flexible joint were obtained, as well as the most dangerous parts might occur leakage were indicated, which provides the reference to the optimal design of ductile cast iron buried pipeline with flexible joint.

Abstract: Shallow spherical shell is one of the structure shapes and is adopted extensively in engineering. Based on the exact solution of free vibration of the shallow-spherical shell, the frequency equations of the shallow spherical shell with clamped edge are derived and calculated numerically. Then the first third-order frequency curve and modal curve and solved. Comparing these with the results of the exact-solution method, the range of of the shallow-spherical shell when calculated by use of practical-solution method can be derived.

Abstract: The main structure of Changge stadium is super-long irregular rectangular plane structure. Under the effect of temperature changing, the internal force and deformation of the structure is complicated. The distribution discipline of temperature effect is concluded through PMSAP software. In the design, some reliable measures with the discipline of ‘resistance’ and ‘release’ are taken to ease the negative impact of the temperature effect.

Abstract: Thermal behaviors of a thin plate under a periodic surface thermal disturbance are investigated. The temperature and the displacement responses are predicted using the parabolic heat conduction model. The solution of temperature response is obtained by separation of variables. Firstly, an analytic expression of heat flux filed within the plate is obtained by using the parabolic heat conduction equation which is described by heat flux vector, then, based on the conservation equation of energy, the temperature response is given. The displacement response of the plate is solved analytically using the Nowachi’s and the Navier’s approachs. The thermal behaviors of a plate with various relatively parameters is calculated numerically and the results shown graphically.