OPEN ACCESS
Cable arch stayed bridges are one type of tensile structures, and there are increasingly such structures constructed. Their performance relies on how they are designed. This type of structures can suffer big deflections under load, in this situation the displacements may need to be reduced. Sometimes, it may be necessary to control internal force of a specific cable so the cable force remains within the desired limit. More study need to be done to develop the techniques that are available for such adjustments. This paper deals with theoretical and experimental adjusting of two physical models, and the linear and nonlinear geometrical behavior of cable (arch) stayed bridges. It was concluded that the techniques of adjustment were practical and efficient to reduce, eliminate shape distortion, and control internal bar force of both structures. For structures that behave linearly, it is easier to get the target (displacement or force), but for non-linear structures one iteration of adjustments was not enough to get the displacement target. Through the techniques of the internal bar force adjustment, the amount of force can be reduced even to the zero, e.g. in case of replacing damaged members.
force method, internal force adjustment, shape restoration, tensile structures and cable arch stayed bridges
[1] Saeed, N.M., Prestress and Deformation Control in Flexible Structures. PhD Thesis, Cardiff University, 2014.
[2] Ziegler, F., Computational aspects of structural shape control. Computers & Structures, 83(15), pp. 1191–1204, 2005. http://dx.doi.org/10.1016/j.compstruc.2004.08.026
[3] Shea, K., Fest, E. & Smith, I.F.C., Developing intelligent tensegrity structures with stochastic search. Advanced Engineering Informatics, 16(1), pp. 21–40, 2002. http://dx.doi.org/10.1016/S1474-0346(02)00003-4
[4] Haftka, R.T. & Adelman, H.M., An analytical investigation of shape control of large space structures by applied temperatures. AIAA Journal, 23(3), pp. 450–457, 1985. http://dx.doi.org/10.2514/3.8934
[5] Edberg, D.L., Control of flexible structures by applied thermal gradients. AIAA Journal, 25(6), pp. 877–883, 1987. http://dx.doi.org/10.2514/3.9715
[6] Burdisso, R.A. & Haftka, R.T., Statistical analysis of static shape control in space struc-tures. AIAA Journal, 28(8), pp. 1504–1508, 1990. http://dx.doi.org/10.2514/3.25245
[7] Kwan, A.S.K. & Pellegrino, S., Prestressing a space structure. AIAA Journal, 31(10), pp. 1961–1963, 1993. http://dx.doi.org/10.2514/3.11876
[8] Du, J., Zong, Y., & Bao, H., Shape adjustment of cable mesh antennas using sequential quadratic programming. Aerospace Science and Technology, 30(1), pp. 26–32, 2013. http://dx.doi.org/10.1016/j.ast.2013.06.002
[9] Weeks, C.J., Static shape determination and control of large space structures: I. The flexible beam. Journal of Dynamic Systems, Measurement, and Control, 106(4), pp. 261–266, 1984. http://dx.doi.org/10.1115/1.3140683
[10] Irschik, H., A review on static and dynamic shape control of structures by piezoelectric actuation. Engineering Structures, 24(1), pp. 5–11, 2002. http://dx.doi.org/10.1016/S0141-0296(01)00081-5
[11] Saeed, N.M. & Kwan, A.S.K., Simultaneous displacement and internal force prescription in shape control of pin-jointed assemblies. AIAA Journal, 54(8), pp. 2499–2506, 2016. http://dx.doi.org/10.2514/1.J054811
[12] Saeed, N.M. & Kwan, A.S.K., Concepts for morphing aerofoil sections using panto-graphic structures. Mobile and Rapidly Assembled Structures IV, 136, p. 279, 2014. http://dx.doi.org/10.2514/1.J054811
[13] You, Z., Displacement control of prestressed structures. Computer Methods in Applied Mechanics and Engineering, 144(1), pp. 51–59, 1997. http://dx.doi.org/10.1016/S0045-7825(96)01164-4