Evaluating Network Serviceability.
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Serviceability (structure)
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Through summarization of research results of environment vibration serviceability at home and abroad,this paper expounds development history of vibration serviceability research,introduces current situation of environment vibration serviceability research,then summarizes from vibration serviceability evaluation index and criterion,and finally prospects future trend of environment vibration serviceability evaluation.
Serviceability (structure)
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One important aspect in the design of many geotechnical structures such as tunnels, retaining walls, and piles is the serviceability failure performance of the structure, i.e., when the actual displacement of the structure exceeds the maximum allowable displacement. A risk-based approach to serviceability performance "failure" is necessary to incorporate systematically the uncertainties associated with various design parameters. This paper demonstrates the use of an integrated neural network-reliability method to assess the risk of serviceability failure through calculation of the reliability index. An illustrative example for a braced retaining wall is presented using this approach.
Serviceability (structure)
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Serviceability (structure)
Limit state design
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Excavation projects related to urban redevelopment and infrastructure improvement are often governed by serviceability-based design, rather than failure prevention criteria. Deformation tolerance specifications are often prescribed based on minimizing potential damage to adjacent structures. A risk-based approach to serviceability performance that systematically incorporates design parameter uncertainty will allow engineers to address soil uncertainty in performance-based design. This paper demonstrates the use of various kinds of reliability methods, such as response surface method (RSM), first-order reliability method (FORM), second-order reliability method (SORM), adaptive importance sampling (AIS), Monte Carlo simulation (MCS) and system reliability, to assess the risk of stability and/or serviceability failure of an entire excavation support system throughout the entire construction process. By considering multiple failure modes (including serviceability criteria) of an excavation, the component and system reliability indices for each excavation step are assessed during the entire excavation process. Sensitivity analyses are conducted for the system reliability calculations, which demonstrate that the adjacent structure damage potential limit state function is the dominant factor for determining excavation system reliability. An example is presented to show how the serviceability performance for braced excavation problems can be assessed based on the system reliability index.
Serviceability (structure)
First-order reliability method
Limit state design
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Serviceability (structure)
Factor (programming language)
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In this paper, the author advances a fuzzy set theoretic approach that enables the environmental present serviceability index (PSI) loss determination to be accomplished in a better defined and repeatable manner using the same AASHTO procedures. In this approach, the designer's qualitative descriptions of the relevant attributes are transformed to well defined fuzzy sets stored in the computer. At this stage of the development, fuzzy sets mathematics principles take over the manipulation process dictated by the AASHTO guidelines, to predict the PSI loss thus ensuring repeatability and consistency. The new technique is further illustrated by predicting the PSI loss anticipated due to swelling using a computer program developed by the author.
Serviceability (structure)
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Serviceability limit state (SLS) considerations often govern the design of foundations. The objective of this paper is to review the limited literature on reliability-based design for SLS and to suggest useful directions for future work. A review of several new design codes indicates that ultimate and serviceability limit states are not verified in the same way. The former check conforms to reliability principles, but the latter is essentially verified in a deterministic way. To address SLS within the reliability framework, it is necessary to characterize the uncertainties associated with foundation displacements and tolerable displacements. The former is discussed with particular attention to spatial correlation, model uncertainties, and load-displacement nonlinearities. Uncertainties in tolerable displacements are discussed using two case histories.
Serviceability (structure)
Limit state design
Foundation (evidence)
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This paper analyzed factors that affect the serviceability of roads. Based on the analysis, a fuzzy comprehensive assessment model was established using the fuzzy mathematical method. The model was then applied to survey data of the serviceability of a freeway with reasonable results.
Serviceability (structure)
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Serviceability (structure)
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