Luis María Lacoma Aller

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Co-Authors

Joaquín Martí Rodríguez

University of Nevada, Reno

Francisco J. Martínez Cutillas

Universidad Politécnica de Madrid

Javier Rodríguez Soler

Javier Rodríguez

Hospital El Escorial

María José Crespo Álvarez

Pontificia Universidad Católica de Chile

Francisco J. Martínez

Universidad de Zaragoza

J. Rodríguez

Universidad de Málaga

Jose Marcelo Vega Rodriguez

Central American Technological University

J. Rodríguez

Universidad Politécnica de Madrid

Cooperative Institutions

Universidad Politécnica de Madrid

Universidad de Zaragoza

Universitat Politècnica de València

Association for Computing Machinery

Universidad de Granada

Combat Capabilities Development Command Soldier Center

National University of Distance Education

GMV Innovating Solutions (Spain)

Texas A&M University

European Telecommunications Standards Institute

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Simulation of Temperatures and Stresses during Construction of a RCC Dam

Luis María Lacoma Aller Javier Rodríguez Soler Joaquín Martí Rodríguez Francisco J. Martínez Cutillas

Se describen las variaciones de temperaturas y de tensiones durante la construccion de presas de hormigon compactado. The curing of concrete is an exothermic process. The heat of hydration generated induces temperature increases in the concrete, which will disappear in the long term by heat conduction in the concrete mass and thermal exchanges with the environment. The problem is of particularly interest for large concrete masses, as is the case of dams, because the time involved in the heat diffusion process grows with the square of the dimensions and a hotter dam interior implies the possibility of cracking the exposed surfaces of the dam. The Cuira dam, currently being built in Venezuela using roller compacted concrete, is a 134 m high, arch-gravity dam. In support of the design, different strategies were analysed, including various combinations of cooling of the water and the aggregate in order to achieve acceptable results. The calculations were conducted with Abaqus, taking into account all the necessary mechanical and thermal characteristics, as well as the relevant non-linearities. The analyses led to the conclusion that no cooling was required, even taking into account the stress state imposed by an early and rapid filling of the reservoir.

Mass concrete

Gravity dam

Arch dam

Roller-compacted concrete

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Contribution to Theme A of the Benchmark Workshop: Effect of Concrete Swelling on the Equilibrium and Displacements of an Arch Dam

Javier Rodríguez Luis María Lacoma Aller Francisco J. Martínez Cutillas Joaquín Martí Rodríguez

The Kariba dam is undergoing concrete expansion as a result of an alkali-aggregate reaction. The model adopted to simulate the process is explained in the paper; it is based on the model first proposed by Ulm et al, as later modified by Saouma and Perotti. It has been implemented in the commercial finite element code Abaqus and applied to solve the benchmark problem. The parameters of the model were calibrated using the data recorded up to 1995. The calibrated model was then used for predicting the evolution of the dam up to the present date. Apart from this prediction the paper offers a number of conclusions, such as the fact that the stress level appears to have a major influence on the expansion process; and it presents some suggestions to improve the formulation of the benchmark, such as providing temperature data and widening the locations and conditions of the data employed in the calibration

Benchmark (surveying)

Arch dam

Experimental data

Code (set theory)

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Optimised design of foundations for wind towers

Luis María Lacoma Aller Jose Marcelo Vega Rodriguez Francisco J. Martínez Cutillas Joaquín Martí Rodríguez

Environmental, political, and other considerations are leading to the installation of growing numbers of wind turbines for electricity generation. The present paper concentrates on onshore installations, in which the turbine is placed at the end of a tower founded on the ground. A serious problem with the foundation or its connection with the tower entails a global failure. A worrying percentage of the towers built before 2010 is ill designed, often with obvious manifestations of the design problem. On the other hand the new designs attempt to optimise material quantities and costs while providing an adequate behaviour under the demands imposed. Principia has gathered considerable experience in both the identification and remediation of the problems experienced by older foundations and the optimisation of new designs. The problem is particularly suitable for numerical simulations with Abaqus and the paper provides the necessary concepts and methodological approach for a reliable and satisfactory solution. More specifically, the concrete geometry is meshed with solid elements. Surface elements including rebar layers are embedded. Other parts of the structure as the steel cylinder, welded studs, anchorage bars, etc. are also included. The concrete behaviour is described with the Abaqus concrete damaged plasticity model. Abaqus/Explicit is used because of the strong non-linearities, mainly caused by concrete cracking and crushing. The methodology allows assessing the suitability of the design for ultimate, serviceability and fatigue limit states.

Serviceability (structure)

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Error estimation and adaptivity in deformable solid dynamics

Luis María Lacoma Aller

Citation Lacoma Aller, Luis María (2006). Error estimation and adaptivity in deformable solid dynamics. Thesis (Doctoral), E.T.S.I. Caminos, Canales y Puertos (UPM). https://doi.org/10.20868/UPM.thesis.678.

Dynamics

10.20868/upm.thesis.678

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Analysis of the lifting process of bridge segments

Luis María Lacoma Aller Javier Rodríguez Francisco J. Martínez Joaquín Martí Rodríguez

The paper deals with the dynamics of the lifting of deck segments for constructing a bridge over water, with segments being brought by barge and lifted by an erection traveler while the barge and the bridge are undergoing the motions induced by the sea state and the wind. To investigate the process, a model was generated that included the barge and the mooring system, the supporting plinths, the bridge segment, the lateral restraints, the lifting strands, the erection traveler, and the bridge deck with its associated stiffnesses. Nearly 400 simulations were conducted, covering combinations of wave, wind, and current forces, as well as other aspects like the deck length and the cracked or uncracked state of the section. The analyses allowed establishing whether the success criteria were being satisfied, the influence of the various parameters, and the potentially more hazardous phases of the lifting process.

BARGE

Bridge (graph theory)

Bridge deck

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Enseñanzas derivadas del Benchmark SMART 2013

María José Crespo Álvarez J. Rodríguez Luis María Lacoma Aller Francisco J. Martínez Cutillas Joaquín Martí Rodríguez

El CEA frances, junto con EDF y la OIEA, recientemente organizaron un benchmark internacional y posterior workshop para evaluar las capacidades de simulacion del comportamiento mecanico de estructuras nucleares de hormigon armado sometidas a acciones sismicas. Principia, que fue el unico participante espanol en el workshop, contribuyo a tres de las cuatro fases del ejercicio, que esencialmente consistia en simular los efectos de terremotos en un modelo a escala de una estructura nuclear tipica, y en comparar los resultados con ensayos posteriores en mesa vibrante y con las predicciones de otros participantes. El articulo presenta algunas conclusiones obtenidas en los calculos pre-ensayo, enriquecidas con observaciones producidas por las simulaciones adicionales llevadas a cabo una vez que se hicieron publicos los resultados de los ensayos.

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Effect of Concrete Swelling on the Equilibrium and Displacements of an Arch Dam

Javier Rodríguez Soler Luis María Lacoma Aller Francisco J. Martínez Cutillas Joaquín Martí Rodríguez

Arch dam

Benchmark (surveying)

Experimental data

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Experience and lessons learnt from the SMART 2013 Benchmark

María José Crespo Álvarez J. Rodríguez Luis María Lacoma Aller Francisco J. Martínez Cutillas Joaquín Martí Rodríguez

The French CEA, together with EDF and the IAEA, recently organised an international benchmark to evaluate the ability to model the mechanical behaviour of a typical nuclear reinforced concrete structure subjected to seismic demands. The participants were provided with descriptions of the structure and the testing campaign; they had to propose the numerical model and the material laws for the concrete (stage #1). A mesh of beam and shell elements was generated; for modelling the concrete a damaged plasticity model was used, but a smeared crack model was also investigated. Some of the initial experimental results, with the mock-up remaining in the elastic range, were provided to the participants for calibrating their models (stage #2). Predictions had to be produced in terms of eigen-frequencies and motion time histories. The calculated frequencies reproduced reasonably the experimental ones; the time histories, calculated by modal response analysis, also reproduced adequately the observed amplifications. The participants were then expected to predict the structural response under strong ground motions (stage #3), which increased progressively up to a history recorded during the 1994 Northridge earthquake, followed by an aftershock. These results were produced using an explicit solver and a damaged plasticity model for the concrete, although an implicit solver with a smeared crack model was also investigated. The paper presents the conclusions of the pre-test exercise, as well as some observations from additional simulations conducted after the experimental results were made available.

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Benchmark (surveying)

Experimental data

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