Adjustment for shape restoration and force control of cable arch stayed bridges

Abstract

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.

A Review of Nonlinear Control Strategies for Shape and Stress in Structural Engineering

“…A major development in the nonlinear control of structural engineering is the merging of form and stress control techniques [31]. Combining control over stress management with structural form manipulation enables a holistic strategy for maximizing both performance and safety [7,10,11,31,132]. To accomplish this dual goal, a combination of neural networks, fuzzy logic, model predictive control, and adaptive control can be used [7,11,132].…”

“…Traditional linear control schemes [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], although useful, are not always able to capture the complex behaviors that are inherent in structural systems [17]. In structural engineering, nonlinearities can originate from a number of factors, including geometric configurations, material properties, large deflections or rotations, and dynamic loading scenarios [18][19][20][21].…”

Using Minimum Actuators to Control Shape and Stress of a Double Layer Spherical Model Under Gravity and Lateral Loadings

“…Researchers applied the techniques of shape adjustment to several structures, for example cable mesh structures [18,19] and cable-stayed bridges [20]. In addition, Du, Zong [21] implemented SQP algorithm to control the shape of a cable mesh antenna.…”

“…Moreover, axial force control of prestressable trusses has been detailed by Kwan and Pellegrino [23]. The approach of shape and stress control has been applied to different structures, for instance, trusses [24,25], cable structures [26,27], and cable arch-stayed bridges [20]. Besides controlling the shape and stress of structures, researchers tried to optimize the cost of undertaking it.…”

Archives of Civil Engineering

“…In some cases, it is essential to consider joint displacements and bar internal forces simultaneously, which is the case in this study. In terms of controlling shape and stress simultaneously, researchers used the bases of the Linear Force Method [20,21]. In this study, the simultaneous equation previously introduced by Saeed and Kwan [3] is implemented to reshape the outer face of the numerical spherical model; meanwhile, the stress is kept within the yield stress limit.…”