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 , 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: 10.15224/978-1-63248-054-5-116
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INELASTIC BEHAVIOR OF STEEL SPECIAL MOMENT FRAMES UNDER NEAR FAULT GROUND MOTIONS
Published In: 2ND INTERNATIONAL CONFERENCE ON ADVANCES IN CIVIL, STRUCTURAL AND MECHANICAL ENGINEERING
Author(s): DEVRIM OZHENDEKCI
Abstract: This work is conducted to investigate the effects of near fault ground motions on the peak story drift ratios and structural elements’ displacements. Two sets, each consists of seven near fault ground motion records are prepared. The records of each set are scaled in order that their average spectrum approaches to the design response spectrum by following the rules provided in ASCE/SEI 07-10. One of the sets consists of records with pulses whereas the other is established with records without pulses. A ten story steel special moment frame is designed to the Load and Resistance Factor Design of the ANSI/AISC 360-10. Applied capacity based design principles for providing global ductility are along with ANSI/AISC 341-10. The loads and load combinations are compatible with ASCE/SEI 7-10. The results indicate that although the peak values do not change much, the dispersion of the drift ratios and the element displacements are considerably higher for the set of pulse type records.
- Publication Date: 17-Nov-2014
- DOI: 10.15224/978-1-63248-054-5-117
- Views: 0
- Downloads: 0