MODIFIED WEIBULL APPROACH TO DETERIORATION MODELLING: AN APPLICATION TO BRIDGE ELEMENTS
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): NIROSHAN K. WALGAMA WELLALAGE , TIELING ZHANG , RICHARD DWIGHT
Abstract: State-based Markov deterioration models (SMDM) sometimes fail to find accurate transition probability matrix (TPM) values, and hence lead to invalid future condition prediction or incorrect average deterioration rates mainly due to drawbacks of existing nonlinear optimization-based algorithms and/or subjective function types used for regression analysis. Furthermore, a set of separate functions for each condition state with age cannot be easily derived by using Markov model for a given bridge element group, which however is of interest to industrial partners. This paper presents a new approach for deterioration modelling that follows homogeneous Markov models, namely, the Modified Weibull approach, which consists of a set of appropriate functions to describe the percentage condition prediction of bridge elements in each state. These functions are combined with Bayesian approach and Metropolis Hasting Algorithm (MHA) based Markov Chain Monte Carlo (MCMC) simulation technique for quantif
- Publication Date: 17-Nov-2014
- DOI: 0.15224/978-1-63248-054-5-116
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POLLUTION CONTROL OF WASTEWATER IN RECHARGE AQUIFER
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): MAHMOUD A. ELSHEIKH , WALEED K. ALHEMAIDI
Abstract: Groundwater resources of Saudi Arabia are depleting at a very fast rate due to the high water supply withdrawing. Natural renewable and recharging of groundwater are done through infiltration of rainwater which are not enough in Saudi Arabia. Partially treated wastewater is used as an artificial method for recharging the groundwater. A high degree of upgrading can be achieved in Soil Aquifer Treatment (SAT) system by allowing partially treated sewage to infiltrate into the soil and move down to the groundwater. The paper uses the criteria of the existing wastewater treatment plant of Tabuk city for recharging the plant effluent into the groundwater. This study reviews many recent researches in the field of the SAT systems and their application. The reviewing of the previous study in the field of the SAT included the required wastewater characteristics, existing groundwater conditions, quality and usages of groundwater, and existing soil conditions and their suitability for a SAT system
- Publication Date: 17-Nov-2014
- DOI: 10.15224/978-1-63248-054-5-115
- Views: 0
- Downloads: 0