Seismic reliability and rehabilitation decision of water distribution system

Abstract

In order to evaluate the seismic reliability of water distribution system and make rehabilitation decisions correspondingly, it is necessary to assess pipelines damage states and conduct functional analysis based on pipe leakage model. When an earthquake occurred, the water distribution system kept serving with leakage. By adding a virtual node at the centre of the pipeline with leakage, an efficient approach to pressure-driven analysis was developed for simulating a variety of low relative scenarios, and a hydraulic leakage model was also built to perform hydraulic analysis of the water supply network with seismic damage. Then the mean-first-order-second-moment method was used to analyse the seismic serviceability of the water distribution system. According to the assessment analysis, pipes that were destroyed or in heavy leakage were isolated and repaired emergently, which improved the water supply capability of the network and would constitute the basis for enhancing seismic reliability of the system. The proposed approach to seismic reliability and rehabilitation decision analysis on water distribution system is demonstrated effective through a case study.

Keywords

water distribution system / hydraulic analysis / leakage model / seismic reliability / rehabilitation decision

References

[1] Liu C. G., Lin G., Li H. N., et al. Introduction of Lifeline Earthquake Engineering[M]. 2005, Dalian: Dalian University of Technology Press.

[2] Chen L. L., Li J., Ye Z. M. Hydraulic analysis of postearthquake water supply network[J]. Journal of Natural Disaster, 2003, 13(3): 89-94.

[3] Ang W. H., Jowitt P. W. Solution for water distribution systems under pressure-deficient conditions[J]. Journal of Water Resources Planning and Management, 2006, 132(3): 175-182.

[4] Han Y, Sun S P. Seismic reliability of urban pipeline network system[C]. In: Proceedings of the 6th US Conference and Workshop on Lifeline Earthquake Engineering. Long Beach, CA, USA, 2003. 445–454.

[5] Liu Xuejie, Hou Zhongliang. Earthquake disaster forecast and seismic games for pipe network[C]. In: Institute of Earthquake Disaster Mitigation, Central Research Institute of Building and Construction, MCC Group, Seismic Analytical Method and Application of Buried Pipeline. Harbin, 1991. 87–94 (in Chinese).

[6] Paul K., Tiku T. T. Redundancy model for water distribution systems[J]. Reliability Engineering and System Safety, 2003, 82(3): 275-286.

[7] Almandoz J., Cabrera E., Arregui F., et al. Leakage assessment through water distribution network simulation[J]. Journal of Water Resources Planning and Management, 2005, 131(6): 458-466.

[8] Wu Z Y, Walski T M. Pressure dependent hydraulic modelling for water distribution systems under abnormal conditions[C]. In: Proceedings of IWA World Water Congress. Beijing, 2006. 10–14.

[9] Yan X., Zhao Hongbin. Theory and Calculation of Water Supply Network[M]. 1986, Beijing: China Architecture and Building Press.

[10] Li Jie. Seismic Basic Theory and Application of Lifeline Engineering[M]. 2005, Beijing: Science Press.

[11] Cheng C. X., Ian C. G. Probabilistic model for water distribution reliability[J]. Water Resources Planning and Management, 1998, 124(4): 218-228.

[12] Orazio G., Zoran K., Dragan S. Algorithm for automatic detection of topological changes in water distribution networks[J]. Journal of Hydraulic Engineering, 2008, 134(4): 435-446.

[13] Hwandon J., Loganathan G. V. Valve-controlled segments in water distribution systems[J]. Journal of Water Resources Planning and Management, 2007, 133(2): 145-155.

[14] Liu C. G., Zhang A. Y. Seismic performance analysis on water supply network[J]. Journal of Engineering Mechanics, 2007, 24(3): 142-146.