Volume 21, No. 37Journal 37

Jhair Andrés Manrique Bautista, Jose Carlos Jimenez Serpa, Miller Humberto Salas Rondón (Author)

Accessibility: fundamental for implementation of transportation infrastructure element

• PDF (Spanish)

The Metropolitan Area of Bucaramanga -AMB- currently presents a critical situation of mobility generated by different factors whether political, social or territorial, therefore an investment methodology is necessary in terms of road infrastructure that benefits the greatest number of inhabitants possible. This research aims to inform, strengthen, optimize and improve the road conditions present throughout the Colombian territory, showing that with a procedure of road project selection in terms of time, generalized cost of travel and optimization of public resources, it ensures a benefit for the community and not for a private individual. The methodology used was based on the determination of accessibility indices obtained from two scenarios, the current one, (refers to the existing road network in AMB) and the future, (existing road network plus future road projects) modeled through the TransCad software, in which a future road network was obtained that represented savings in Colombian pesos of $ 4.365 million (1,51 million USD).

Juan Carlos Múnera Miranda, José Pablo Aguiar Moya (Author)

Estimation of the resilient modulus for granular materials of Costa Rica

• PDF (Spanish)

The resilient modulus is a measure of the ability of a material to store or absorb energy without experiencing permanent deformation. This is determined by triaxial tests of repeated load and is an important parameter in the analysis and design of flexible pavements. With its value it is possible to predict the mechanical response of the pavement as stresses, deformations and deflections. However, obtaining it is expensive for the equipment involved and not all material laboratories have the test. Because of this, pavement designers use correlations to approximate a resilient modulus value, which generally differs considerably from that obtained with the test. The following research aims to estimate a universal model of a resilient modulus for granular materials that considers variables related to stress states and the basic characteristics of the materials. For this, a linear regression model was generated using ordinary least squares with data from at least 13 different granular materials. The model was validated by statistical indicators obtaining an acceptable goodness of fit.

Daniela Segura Segura, Diana Jiménez Romero (Author)

Assessment of the area of influence of San José-Sabanilla-La Campiña public transportation trunk corridor: Applying the transit oriented development methodology

• PDF (Spanish)

The lack of territorial planning in the Great Metropolitan Area (GMA) has led to urban growth so dispersed and disordered (Rodríguez, 2017). In addition to this, the inefficient public transport system has caused a dependency on the private vehicle, which generates large costs to the country in economic, social and environmental terms (PEN, 2015). Thus, the main challenge for GAM is to plan land use in conjunction with an efficient transport system.

The main proposals for urban development are aimed at joint planning between transport and land use, as well as favouring pedestrian movements (Cardozo, Gutiérrez, & García, 2010). One way of evaluating if the city is planned in terms of mobility is though the TOD (Transit Oriented Development) Standard methodology, which is a tool for assessing whether urban development plans and products adhere to the principles of urban mobility (ITDP, 2017).

This article presents the results of a research (Segura, 2019) in which the Standard TOD methodology was applied (ITDP, 2017) to evaluate the area of influence of five bus stops in a section of the San José-Sabanilla-La Campiña mass transit trunk, which is part of the GAM mass transit modernization project. Based on the score obtained, it was determined that the study area was not planned in terms of mobility and were identify some interventions that could significantly improve it.

In addition, some recommendations are presented that should be implemented in the planning of the corridor, such as densifying the area, investing in public space and mixed land uses, so that, once the GAM mass transit modernization project is implemented, users will be encouraged to use this system.