Applied Mechanics and Materials Vols. 578-579

Abstract: Temporary grandstands bear crowd load, which is created when spectators jumping on the structure. The simplified loads applied to temporary grandstand have been obtained based on experiment data of human body jumping forces. By the ABAQUS software, the parametric and automatic modeling of three-dimensional (3D) temporary grandstand structures has been realized with Python scripting. The linear buckling analysis and nonlinear buckling analysis of the structure have been carried out. The ultimate bearing capacity and the structural deformation under crowd load have been acquired. Results show that the nonlinear effect of the structure under crowd load is very obvious; the linear buckling analysis cannot get the ultimate bearing capacity of the structure and the first order buckling mode cannot simulate the final deformation of the structure either. The research of this paper greatly improve the efficiency of the construction and automation design of temporary structures and reveal the mechanical behavior of such structure to a certain degree.

Abstract: In this paper, using the finite element method,check for the Ken Swart project sand flushing water all operating tower in static stability. First of all, select unit and a calculation model, establish the finite element model; Then analys the displacement distribution and stress distribution of the structure in the five conditions.

Abstract: Combined with the city of Baotou Arden Street underground passage pipe jacking engineering, using three-dimensional finite element software ANSYS to simulate the process of rectangular pipe jacking construction, this paper will emphasis on the influence of soil displacement around the construction site of the rectangular pipe jacking construction under dynamic loads. Through research, it got the rectangular pipe jacking construction sphere of influence of soil disturbance, and the variation in both horizontal and vertical direction, and compared with the measured data, proved that the numerical simulation has important guiding significance to the pipe jacking construction, will provide a reference for the future construction of similar projects.

Abstract: Analytical software has powerful features in structural analysis. This paper elaborates the modal of the mechanical plate-shell structure with three layers by ANSYS software ,from which natural frequencies and mode shapes are obtained. Based on this,taking the three layer structure applied with harmonic load as the study object,this paper analyzes the displacement change trend of different positions under different frequencies,and the displacement characteristic curves are obtained,which would provide a certain theoretical basis for the arrangement of measuring points and the yield characteristics analysis in subsequent structural detection.

Abstract: In order to determine the most unfavorable condition of the steel box girder, ensure its stress and deformation in the safe state, the steel box girder bridge should apply the finite element analysis software to modeling analysis. At the same time, data calculation can provide the theoretical evidence for the factory manufacturing lines. The tender DB01 of the continuous bridge of the Hong Kong-Zhuhai-Macao Bridge provides the backdrop for this essay, using MIDAS/Civil 2012 to do numeral simulation analysis on the hoisting, and then analyzing the stress and deformation of the main beam at the different construction stages. The analysis reveals that the temporary maximum of a hinged steel box girder should be 47.5MPa in the process of construction which is allowed by the stress of the steel Q 345.And after the No.1 beam has been put in the right place and connected, the maximum displacement of the No.6 joint is 19.4mm downward. With the construction stage CS7 completed, the maximum downward displacement is 14.2mm. Making the stress free alignment is superposing the minus figure of the cumulative displacement on the basis of designed line. Each beam segment has been made according to the stress free alignment .Also, after field construction, the ideology of designed lines of the bridge will be brought into reality.

Abstract: Nonlinear numerical analysis of the stress performance of SRC-RC transfer columns was carried out in this paper with the finite element software of ABAQUS. Compered with the experimental result , numerical analysis result are found to be reasonable.Then the influence of factors such as extension length of shape steel , area ratio of shape steel and axial-load ratio were contrastively analyzed . The results show that extension length of shape steel and the area ratio of shape steel have a greater influence on the bearing capacity and the hysteretic performance of transfer column ,but axial-load ratio has less influence .

Abstract: With the increasing of variables and orders of polynomial expansion, the undetermined coefficients of the response surface model have increased dramatically. The insignificant expansion terms should be eliminated because not all of the expansion terms have significant effect on the response. The improved and practical updating method based on response surface model by stepwise regression, which can effectively reduce the undetermined coefficients on the premise of guaranteeing the correcting accuracy, is proposed in this paper. The method is also applied to update the finite element model of a bridge with prestressed reinforced concrete rigid frame-continuous girders based on the in-situ dynamic test results. The results show that the updated finite element model can match the mechanical properties of the bridge well.

Abstract: The principle and processof finite element model of ANSYS software for RC frame column was introduced firstly,and then the cracking and development rules of RC columns under monotonic load were analyzed with ANSYSsoftware. The results show that: with the stirrup ratios increasing, the short columnwith rectangle hoop, rectangle cross brace hoop and tic tac toe stirrups appearsuccessively few inclined cracks and more vertical cracks; with the axialcompression ratio increasing, more length of horizontal cracks extend to naturalaxis, more vertical cracks appear and appeared cracks are higher along thecolumn height direction for middle length HSC frame columns; the length of OSCframe columns is not so long than that of HSC frame columns, and the crack distributionis dense and crack forms mesh, which show better ductility.

Abstract: An efficient linear elastic iterative finite element method, namely, the elastic modulus reduction method is introduced to calculate limit load of frame structure. The elastic modulus reduction method defines the element bearing ratio on the basis of the generalized yield criterion and the strain energy equilibrium principle. Because the bending moment is the main factor inducing the frame structure damage, the element bearing ratio only considering the bending moment yield is proposed. Numerical examples demonstrate the applicability and precision of the elastic modulus reduction method for limit analysis of frame structures.

Abstract: Main bridge of Nanning Bridge is taken as Research Object. Using the finite element program ANSYS, space finite element model of an arch bridge with two inclined thin-walled steel box ribs is build, stability safety factor of the bridge is calculated, eigenvalue buckling analysis and non-linear buckling analysis of inclined thin-walled ribs are carried out, and stability performance is discussed. The result shows that stability problems of this bridge mainly occur on the ribs and are out-of-plane buckling in general, and horizontal loads have greater influences on out-of-plane buckling. The calculation results can provide parameters for construction, health detection and maintenance in the operational phase of the bridge.