Similar articles

Abstract: A condition assessment model for cable-stayed bridge was proposed, and a cable tension, elevation and frequency condition assessment model was then applied. With the optimized cable tensions as criterion, upper and lower bounds were then introduced. With the elevation of bridge completion as benchmark, and with the allowable vertical displacement of control points to interpolate to generate the upper and lower bounds of elevation, algorithm of condition assessment was programmed. Using moderate index model to interpolate linearly, and with the application of variable weight synthesizing principle (VWSP) and correlation of slope coefficient, according to a set of inspection and monitoring data, performance condition of cable tension, elevation and frequency were calculated. Results showed that with the decrease of balanced coefficient α, the assessment result is a process of degradation. The more divergent the variable weight is, the more severe is the degradation of the bridge component, and the larger is the curvature of curve α-V. Eventually, the model predicted that, for those bridge components whose grade of single survey point is exactly the same, the curvature of curve α-V is constant zero, i.e. there is no correlation between the assessment result and the balanced coefficient α. Numerical simulation showed that it agrees quite well with the expectation.

[1] Catbas, F.N., Aktan, A.E., 2002. Condition and damage assessment: issues and some promising indices. Journal of Structural Engineering, 128(8):1026-1036.

[2] Deng, J.L., 1982. Control problems of grey system. Systems Control Lett., 1(5):288-294 (in Chinese).

[3] Guo, H.X., Ren, B.S., Qian, J.R., 2002. Assessment system for existing simply supported girder type reinforced concrete bridge structures in Beijing. Journal of Tsinghua University (Sci & Tech), 42(6):825-827, 831 (in Chinese).

[4] Kawamura, K., Miyamoto, A., 2003. Condition state evaluation of existing reinforced concrete bridges using neuro-fuzzy hybrid system. Computers & Structures, 81(18-19):1931-1940.

[5] Lan, H., Shi, J.J., 2001. Degree of grey incidence and variable weight synthesizing applied in bridge assessment. Journal of Tongji University, 29(1):50-54 (in Chinese).

[6] Liu, W.Q., 1997. Balanced function and its application for variable weight synthesizing. Systems Engineering-Theory & Practice, 4:58-64 (in Chinese).

[7] Mazurek, D.F., DeWolf, J.T., 1990. Experimental study of bridge monitoring technique. Journal of Structural Engineering, ASCE, 116(9):2532-2549.

[8] Morera, O.F., Budescu, D.V., 2001. Random error reduction in analytic hierarchies: a comparison of holistic and decompositional decision strategies. Journal of Behavioral Decision Making, 14(3):223-242.

[9] Wang, S.Y., Yang, D.Q., Liu, G.H., 1991. Optimization Principle, Method and Engineering Application. Zhejiang University Press, Hangzhou, p.235-328 (in Chinese).

[10] Wu, H.C., Xiang, Y.Q., Weng, S.L., 2005. On optimization of cable force with dead load of cable-stayed bridge. China Municipal Engineering, 116:39-41 (in Chinese).

[11] Xiao, R.C., Xiang, H.F., 1998. Influence matrix method of cable tension optimization for cable-stayed bridge. Journal of Tongji University, 26(3):235-240 (in Chinese).

[12] Zhu, K.L., 1996. Nonlinear dimensionless fuzzy handling of evaluation indexes. Systems Engineering, 14(6):58-62 (in Chinese).