http://repositorio.ufc.br/handle/riufc/480 2026-04-04T19:44:19Z http://repositorio.ufc.br/handle/riufc/84539 Título: Análise do custo do ciclo de vida das estratégias para manutenção da resistência à derrapagem em pista de pouso e decolagem Autor(es): Carneiro, Rayssa de Sousa Abstract: Maintenance and rehabilitation (M&R) of airport pavements are essential to ensure skid resistance, which directly impacts the safety of landing and takeoff operations. To comply with the guidelines set by the National Civil Aviation Agency (ANAC), airport operators must carry out M&R in a way that optimizes scarce financial resources while maintaining optimal operational safety conditions. In this context, Life-Cycle Cost Analysis (LCCA) provides a rational framework to support M&R decisions, promoting the efficient use of resources. This study aims to evaluate M&R strategies focused on ensuring skid resistance on Brazilian runways, based on LCCA. Three M&R scenarios were compared for three runways with different surface treatments (asphalt concrete, grooved asphalt concrete, and porous friction course), focusing on maintaining skid resistance, as measured by the friction coefficient. The study used predictive models based on historical data to estimate the behavior of the friction coefficient and determine the appropriate timing for interventions on each runway. The economic evaluation using LCCA was carried out through Net Present Value (NPV) analysis, both deterministically and probabilistically, considering direct costs, and was complemented by a cost-effectiveness analysis. A reduction in the friction coefficient was observed in all three runways after the last rehabilitation, indicating surface texture wear and suggesting that isolated rubber removal may not be sufficient, thereby highlighting the need for M&R interventions.The LCCA results showed that preventive maintenance is more advantageous regardless of surface type, as it reduces both costs and their variability, in addition to being more effective in preserving skid resistance. Conversely, performing rehabilitations only when the friction coefficient falls below the minimum threshold results in higher costs and compromises operational safety. The runway with grooved asphalt concrete presented the highest predicted friction coefficient values; however, it incurred higher life-cycle costs. LCCA proved to be effective in the economic evaluation of M&R strategies aimed at ensuring skid resistance, enabling the efficient allocation of financial resources and contributing to pavement durability and operational safety. Tipo: Dissertação 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/84517 Título: Análise da influência dos planos diretores de Fortaleza na localização de armazéns logísticos Autor(es): Brito, Bruno Reges Almeida de Abstract: This dissertation investigates the interaction between urban planning and the distribution of logistics warehouses in the city of Fortaleza, analyzing how urban planning guidelines influence the location of these facilities and contribute to the process of logistics expansion. Rapid population growth in urban areas demands an increasing movement of goods, essential for the daily functioning of cities, making the strategic location of logistics warehouses crucial for the efficiency of urban freight transport (UTC). The premise is that the relocation of warehouses in recent decades is influenced by a lack of coordination between urban planning and logistics systems, as well as guidelines that fail to ensure efficient accessibility to urban freight. Therefore, the research seeks to answer the central question: "How are logistics warehouse locations influenced by urban planning?" by analyzing the guidelines in Fortaleza's master plans and their relationship with warehouse locations, and consequently, accessibility in the context of freight. To this end, a systematic literature review is conducted to consolidate planning guidelines that may affect the distribution of these facilities. Next, we evaluate the application of these guidelines in master plans over time and their impact on warehouse locations. Finally, we seek to characterize changes in urban freight accessibility during the analyzed period, observing variations in observed locations and those proposed in master plans. This research provides valuable insights for integrating urban planning and logistics needs, aiming to optimize warehouse locations and develop more effective land use policies. Tipo: Dissertação 2025-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/84492 Título: Assessment of connected and autonomous vehicles impacts on urban road safety through microsimulation Autor(es): Oliveira, Gabriela Martins de Abstract: The integration of Connected and Automated Vehicles (CAVs) into urban environments promises significant improvements in road safety and traffic management, particularly at full market penetration. However, the transitional phase of CAV adoption remains poorly understood due to the limited and localized presence of these vehicles. This study aims to evaluate the impact of CAVs on road safety in an urban corridor by examining their longitudinal behavior across varying levels of market penetration and traffic demands. Utilizing the VISSIM microsimulator, this research implemented the Cooperative Adaptive Cruise Control algorithm, designed for longitudinal control of CAVs and incorporating vehicle-to-infrastructure communication. Given that microsimulation does not directly model crashes, the study applied safety continuum theory to assess conflicts—potential crashes arising from risky vehicle interactions. The analysis focused on rear-end conflicts, examining both frequency and severity. Results showed that during the initial transitional period, CAVs could increase conflict occurrences—up to six times in low vehicular demand and twice in high demand—primarily involving conventional vehicles as followers. However, scenarios with full CAV automation demonstrated a 54% reduction in conflicts compared to the base scenario, indicating CAVs potential to improve road safety. Additionally, the study employed a multinomial logit model to assess the impact of CAVs on conflict severity, finding that the probability of high-severity conflicts decreased with greater CAV penetration. This suggests that while conflict frequency may rise during initial deployment stages, the severity of these conflicts does not escalate correspondingly, emphasizing the potential benefits of CAVs in reducing severe accidents. Tipo: Dissertação 2024-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/83333 Título: Confiabilidade do tempo de viagem: uma análise exploratória em vias urbanas de Fortaleza Autor(es): Araújo, Marco Antonio Machado de Abstract: Travel Time Reliability (TTR) is a critical component of the quality of urban transportation systems, yet its dynamics and influencing factors remain underexplored in Brazilian cities. The main objective of this master's dissertation was to characterize TTR on arterial corridors in Fortaleza-CE, exploring the infrastructure, operational performance, and land use factors that potentially affect reliability. Utilizing a database with over 1.2 million trips from 35 urban road sections in 2019, the methodology involved the analysis of the statistical distribution of travel times, the selection of reliability indicators, and the exploration of possible determining factors. This last stage compared parametric linear models with Generalized Additive Mixed Models (GAMMs) to capture complex and possibly non-linear relationships. The results revealed the complexity of traffic variability behavior: although the Lognormal distribution was the best-fitting model (52% of cases), no probability model was adequate in 37% of the scenarios. The factor exploration stage showed the statistical invalidity of the linear models, reinforcing the non-linearity hypothesis. The application of GAMMs demonstrated superior performance (Adjusted R2 of 0.65 for the Buffer Time Index - BTI, and 0.97 for the Travel Time Index - TTI) and allowed for a better understanding of the relationships. The main finding was the non-linear effect of speed on both BTI and TTI, with diminishing reliability and efficiency gains at higher speeds. Additionally, the analysis showed that roads with wider lanes were consistently associated with a worsening of both reliability (higher BTI) and efficiency (higher TTI). It is concluded that TTR in an urban environment such as Fortaleza's is a multifaceted phenomenon, governed by complex interactions that challenge linear assumptions. The study offers a characterization of reliability for important corridors in Fortaleza and proposes a method that suggests the use of non-linear models for the analysis of this phenomenon. Tipo: Dissertação 2025-01-01T00:00:00Z