Failure Analyses of Tower Crane Using Fem and Theoretical Studies (original) (raw)
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In this work paper we will study the dynamic behavior of the tower crane during the horizontaltranslational movement of the load hanging in the crane's boom. Using computer simulations of the crane's virtual model, we will study the influentia of this motion in the crane's construction when fully engaged with load. We will try to find how does the load swinging effect the carrying construction, what happens when load stops somewhere in the crane's boom and at the peak point, and how does this effects some main parts of crane. For this case we created virtually a whole Tower Crane using Finite Elements and model design application MSC.VisualNastran [4]. Dimensions are from standard manufacturers and using DIN 44 [1]. The results will give us a better view about the dynamic occurrences caused by the load horizontal movement.
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The study deals with the numerical analysis aspects that are necessary for identifying of modal parameters of the tower structure as the most important part of the horizontal axis wind turbine, which are basic for the dynamic response analysis. In the present study, the modal behavior of an actual 55-m-high steel tower of 850 KW wind turbine (GAMESA G52/850 model) is investigated by using three-dimensional (3D) Finite Element (FE) method. The model was used to identify natural frequencies, their corresponding mode shapes and mass participation ratios, and the suggestions to avoid resonance for tower structure under the action wind. The results indicate that there is a very good agreement with the fundamental vibration theory of Euler-Bernoulli beam with lamped masse in bending vibration modes. When the rotor of the wind turbine runs at the speed of less than or equal to 25.9 rpm it will not have resonant problems (stiff–stiff tower design). Furthermore, in case the rotor runs at the...
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The dynamic model of tower cranes has been analysed and presented by authors in two other conferences as well as his mathematical model of the differential equations of movement, considering the tower cranes anchored on the buildings. However, this paper presents the analytical solution for sinusoidal seismic actions in the case of the tower cranes without anchors. The solution is obtained for the MTO-180 tower crane. The diagrams of the absolute and relative displacements, velocities and accelerations are obtained and represented graphically by means of MATHCAD programme.
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Wind turbine technology has developed tremendously over the past years. In Egypt, the Zafarana wind farm is currently generating at a capacity of 517 MW, making it one of the largest onshore wind farms in the world. It is located in an active seismic zone along the west side of the Gulf of Suez. Accordingly, seismic risk assessment is demanded for studying the structural integrity of wind towers under expected seismic hazard events. In the context of ongoing joint Egypt–US research project ‘‘Seismic Risk Assessment of Wind Turbine Towers in Zafarana wind Farm Egypt’’ (Project ID: 4588), this paper describes the dynamic performance investigation of an existing Nordex N43 wind turbine tower. Both experimental and numerical work are illustrated explaining the methodology adopted to investigate the dynamic behavior of the tower under seismic load. Field dynamic testing of the full-scale tower was performed using ambient vibration techniques (AVT). Both frequency domain and time domain methods were utilized to identify the actual dynamic properties of the tower as built in the site. Mainly, the natural frequencies, their corresponding mode shapes and damping ratios of the tower were successfully identified using AVT. A vibration-based finite element model (FEM) was constructed using ANSYS V.12 software. The numerical and experimental results of modal analysis were both compared for matching purpose. Using different simulation considerations, the initial FEM was updated to finally match the experimental results with good agreement. Using the final updated FEM, the response of the tower under the AQABA earthquake excitation was investigated. Time history analysis was conducted to define the seismic response of the tower in terms of the structural stresses and displacements. This work is considered as one of the pioneer structural studies of the wind turbine towers in Egypt. Identification of the actual dynamic properties of the existing tower was successfully performed based on AVT. Using advanced techniques in both the field testing and the numerical investigations produced reliable FEM specific for the tested tower, which can be further used in more advanced structural investigations for improving the design of such special structures.
has been at BRE or 10 years and is now Head of the geotechnics group. She has published widely, including guidance documents for industry relating to BSEN 1997, temporary platforms, brownfield geotechnics and ground treatment as well as on a variety of research topics in numerous journals and conferences.
2013
This paper presents distributed parameter dynamical modeling capabilities of single-mast stacker crane structures. In the frame structure of stacker cranes due to external excitation or inertial forces undesirable structural vibrations may arise. These vibrations reduce the stability and positioning accuracy of stacker crane and causes increasing cycle time of storage/ retrieval operation. Thus it is necessary to investigate of these vibrations. In this paper the dynamical behavior of single-mast stacker cranes is approximated by means of distributed parameter models. The first model is a cantilever beam model with uniform material and cross-sectional properties. This model is used to demonstrate fundamental properties of Euler-Bernoulli beam models. The second model is cantilever beam model with variable cross-sectional properties and lumped masses. The eigenfrequencies and mode shapes of this mast-model are determined by means transfer matrix method. In the third model the whole structure of single-mast stacker crane is modeled. Beside the eigenfrequencies and mode shapes of this model the Bodediagrams of frequency response function is also calculated.
Dynamic Response of Anchored Tower Cranes under Sinusoidal Damped Seismic Action, Case Study
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The subject of the behavior of tower cranes under seismic motion, it is particularly one. On September 2009, in the XXXIII National Conference on Mechanics of Solids -Romania, the authors presented the hypothesis of analysis, the dynamic model and the general system of differential equations of motion, considering the tower with and without anchors to the building. The research was continued with the study of the response of the tower cranes without anchors, loaded by the payload, under sinusoidal seismic actions. The results were presented at the 10 th International Conference on Acoustics and Vibration on 2011. However, this paper continues these studies, considering the seismic motion in a more accurate approach. The comparative results are presented in a case study, for the MTO-180 tower crane.