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Keywords: cable-membrane structure, experiment, laboratory test, measurement equipment, force, natural frequency.

Summary

A complex system of equipment and devices for evaluation of stresses in the structural elements (i.e. the cables and membranes) of cable-membrane structures with an accuracy within 5% has been created.

A device for determination of the force in the anchorage cable of the membrane has been created. This device will is connected with the monitored cable, the force needed for the transversal deflection of the cable is measured electronically. The value of the axial force is evaluated based on the relationship between the axial load, the transversal deflection and the corresponding force. This relationship is also influenced by the stiffness of the investigated cable and the stiffness of the connection between the cable and the membrane. Therefore, calibration is done for commonly made cables and membranes to add these influences to the relationship. The second order theory is used for nondestructive measurement. If the cable is considered as perfectly flexible, then the axial force can be calculated from the measured transverse displacements and the corresponding force.

Further, the device for determination of the force in the membrane has been developed. This device demarcates the area on the membrane. The value of the membrane loading is evaluated based on the relationship between it and the natural frequency of the demarcated area. The stresses in the membrane are usually not the same in different directions. The arrangement of the device is designed to take this influence into account. For testing of the above mentioned devices and for getting the calibration relations for commonly made types of cables and membranes, a calibration device has been designed and made. The forces in cables and the stresses in membranes in two perpendicular directions are continually measured during experiments using this device.

The data obtained from the equipment developed in the experimental part of the project is used for the verification of computational models of cable-membrane structures [1]. A comparison is made between the results from the computational models, those from experiments carried out on simple membrane structures in the laboratory and those from real structures in situ.

References

1: P. Fajman, M. Polák, "Verification of the design of structural membranes via measurements", Structural Membranes 2009, CIMNE Barcelona, 2009.

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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 96 PROCEEDINGS OF THE THIRTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING Edited by: B.H.V. Topping and Y. Tsompanakis Paper 190 Measurements of Forces in Cable Membrane Structures J. Máca, P. Fajman and M. Polák Faculty of Civil Engineering, Czech Technical University in Prague, Czech Republic doi:10.4203/ccp.96.190 purchase the full-text of this paper Full Bibliographic Reference for this paper , "Measurements of Forces in Cable Membrane Structures", in B.H.V. Topping, Y. Tsompanakis, (Editors), "Proceedings of the Thirteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 190, 2011. doi:10.4203/ccp.96.190 Keywords: cable-membrane structure, experiment, laboratory test, measurement equipment, force, natural frequency. Summary A complex system of equipment and devices for evaluation of stresses in the structural elements (i.e. the cables and membranes) of cable-membrane structures with an accuracy within 5% has been created. A device for determination of the force in the anchorage cable of the membrane has been created. This device will is connected with the monitored cable, the force needed for the transversal deflection of the cable is measured electronically. The value of the axial force is evaluated based on the relationship between the axial load, the transversal deflection and the corresponding force. This relationship is also influenced by the stiffness of the investigated cable and the stiffness of the connection between the cable and the membrane. Therefore, calibration is done for commonly made cables and membranes to add these influences to the relationship. The second order theory is used for nondestructive measurement. If the cable is considered as perfectly flexible, then the axial force can be calculated from the measured transverse displacements and the corresponding force. Further, the device for determination of the force in the membrane has been developed. This device demarcates the area on the membrane. The value of the membrane loading is evaluated based on the relationship between it and the natural frequency of the demarcated area. The stresses in the membrane are usually not the same in different directions. The arrangement of the device is designed to take this influence into account. For testing of the above mentioned devices and for getting the calibration relations for commonly made types of cables and membranes, a calibration device has been designed and made. The forces in cables and the stresses in membranes in two perpendicular directions are continually measured during experiments using this device. The data obtained from the equipment developed in the experimental part of the project is used for the verification of computational models of cable-membrane structures [1]. A comparison is made between the results from the computational models, those from experiments carried out on simple membrane structures in the laboratory and those from real structures in situ. References 1 P. Fajman, M. Polák, "Verification of the design of structural membranes via measurements", Structural Membranes 2009, CIMNE Barcelona, 2009. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £130 +P&P)
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