Abstract

Eix 11: Medi ambient i sostenibilitat. Tema: Territori i natura. Subtemes: Catalunya ciutat: equitat i territori. Urbanisme i reversibilitat. Noves visions sobre el paisatge i el patrimoni com a font de valor (subtema proposat per l’autor).

Abstract

The aim of this work is to carry out numerical simulations in the time domain of seakeeping problems taking into account internalflow in tanks, including sloshing. To this aim, a Smooth Particle Hydrodynamics (SPH) solver for simulating internalflows in tanks is coupled in the time domain to a Finite Element Method (FEM) diffraction–radiation solver developed for seakeeping problems. Validations are carried out comparing against available experimental data. Good agreement between obtained numerical results and experimental data is found. & 2016 Elsevier Ltd. All rights reserved.

Abstract

El present treball identifica els reptes dels sòls per activitats econòmiques a Catalunya que, a grans trets, poden resumir-se en una realitat actual caracteritzada per l’obsolescència de molts polígons existents, la seva dificultat per la seva posta al dia, la presència de sòls per activitat econòmica en territoris poc competitius en termes territorials i en termes de la racionalitat econòmica, o bé territoris amb dèficits de disponibilitat de parcel·les de superfície que encaixi amb el mercat. Realitat actual que té a veure, entre d’altres factors, amb un procés de producció de sòl basat fins a dia d’avui en una cadena de valor més focalitzada en la producció de nou sòl (creixements en extensió), que no pas en la gestió i/o renovació dels espais en sòl urbà consolidat (processos de regeneració i renovació urbana). El treball apunta línies d’actuació que tinguin per objectiu l’increment de la competitivitat del territori a partir de l’anàlisi de l’oferta de sòl per activitats econòmiques arreu de Catalunya, la cadena de valor de la transformació urbanística del sòl, la legislació urbanística, i la gestió operativa dels sòls d’activitat econòmica. Paraules clau Urbanisme, planejament urbanístic, sòl industrial, regeneració i renovació urbana, Business Improvement Districts

Abstract

Double curvature arch dams feature geometrical complexity with a significant amount of parameters involved. Different criteria exist to assist in the design task, from simplified geometrical approaches to optimization procedures. However, most of them present a lack of flexibility and are not integrated in computer-aided design tools. In this contribution, an interactive and flexible software tool is presented to support the complete design process: geometrical definition, FEM model generation (including the mesh, the loads and the boundary conditions) and thermo-mechanical analysis. The design can be performed with different levels of detail to adapt to the information available in each stage of the project. The tool allows defining the shape of the reference cylinder, the excavation depth and slope along the foundation, the crown cantilever thickness and curvature, the shape and location of horizontal arcs; all these steps were described in former contributions. Here, special attention is paid to the introduction of additional features such as joints, spillways, abutments of varying shape and outlet works. All steps have been defined with a high degree of flexibility in the design process. The tool is integrated with the pre and post process software GiD, which allows taking advantage of its functionalities, such as mesh generation and results analysis. It is also coupled with a specific application for thermo-mechanical analysis of dams, developed in Kratos Multiphysics – a framework for building parallel multi-disciplinary simulation software. The whole design process can be followed in a unique environment, because the structural response of preliminary designs can be computed and the results considered to refine the dam geometry.

Abstract

Arch dams have different properties that play a relevant role in their behavior, although it is not clear to what degree or in what sense. There is some consensus regarding the relevance of certain factors such as length at crown, height, base and crest thickness, or Young modulus of dam and foundation. However, others such as the shape of arcs and cantilevers, which are correlated and whose effect is more difficult to consider, can also be influential. In this work, a systematic study of the response of arch dams in front of the common loading scenarios has been carried out, taking into account the usual range of variation of their properties. In total, 39 input variables related to geometry, material strength and thermal load were considered. Ranges of variation for each of these parameters have been defined according to the usual design criteria and 3,000 different geometries – together with the corresponding FEM models have been generated with random values of these parameters. The resulting displacements and stresses have been used to fit prediction models based on a machine learning technique named ‘random forests’ that give an estimate of the dam response. The interpretation of these models can be associated with the relative importance of the characteristics of arch dams on each of the behavior variables.