Juan Carlos Vielma

Pontificia Universidad Católica de Valparaíso | PUCV · Institute of Civil Engineering

This work has evaluated the collapse fragility of a typical Chilean building for residential use, structured based on shear-resistant RC walls and inverted beams arranged along its entire perimeter, using the incremental dynamic analysis (IDA) for the evaluation of its structural behavior, using for this the 2018 version of the SeismoStruct softwar...

The present study aims to evaluate the seismic response of hillside buildings, according to two conditions: the variation of the seismic input motion caused by an inclined ground surface, and the variation in the base level inclination of the structure. The main objective of this research is to evaluate the possible differences in the response of h...

Designing prequalified connections is a process of iterative calculation, in which certain dimensions are varied until the verifications and restrictions stipulated by the standard are met. This is a slow process that can be automated using various software and optimized using a new design method called generative design, which consists of establis...

Estimating the dynamic characteristics of instrumented built structures from seismic vibration data collected from built civil structures is essential input information for structural model updating and assessing the health of structures. This study focuses on the earthquake acceleration time histories obtained from several events recorded during i...

The use of hillsides for the construction of structures is problematic, mainly because of two conditions: the variation of the seismic response of the ground, due to the slope; and the modification in the structural configuration to account for the inclination at the base of the structure. These conditions have generated significant seismic damage...

Due to their excellent seismic behavior, shear wall-type concrete buildings are very popular in earthquake-prone countries like Chile. According to current seismic regulations, the performance of such structures can be indifferently assessed through linear or non-linear methods of analysis. Although all the code-compliant approaches supposedly lead...

The following article presents the elaboration and results obtained from a 3D finite element, of the 8-node hexahedron type with 6 degrees of freedom (DOF) per node (48 DOF per element) based on third degree Hermitian polynomials, and of a 2-node structural element, with 6 DOF per node (12 DOF per element), based on third degree Hermitian polynomia...

Current seismic analysis contemplates the simultaneous use of the orthogonal components of an earthquake in order to determine the structural stresses closer to reality. This has led to these components being combined considering a fraction of them, as applying them completely would lead to excessively conservative results. However, their applicati...

On 16 April 2016, an earthquake of Mw 7.8 shook the coast of Ecuador, causing the destruction of buildings and a significant number of casualties. Following a visit by the authors to the city of Portoviejo during the debris removal and recovery stage, it was noted that several reinforced concrete buildings located on corners had collapsed in the ce...

Structural engineers commonly design superstructures as fixed at the base and transmit the reactions to the infrastructure in order to design the foundation system and estimate the displacement of the soil while disregarding the change in seismic response that this induces. In this article, the foundation system was transformed into equivalent spri...

Although the architecture, engineering and construction (AEC) industry is highly relevant to national development, it suffers from significant productivity challenges. Beneath the design and documentation of structures, a dynamic, complex process is taking place, with constant modifications and feedback involving numerous professionals from differe...

Major damage has been reported in hilly areas after major earthquakes, primarily because of two special conditions: the variation in the seismic ground motion due to the inclined ground surface and the irregularities caused by a stepped base level in the structure. The aim of this study is to evaluate possible differences in the responses of Chilea...

The design of end-plate connections for steel structures is more loosely specified in Chil-ean regulations than in American regulations. Nevertheless, eight-bolt extended stiffened (8ES) end-plate connections have not derived benefit from extensive past research, and therefore, their norma-tive recommendations are quite constraining. In this study,...

The Incremental Dynamic Analysis (IDA) assesses the global collapse capacity of a structure by plotting its maximum inelastic response, obtained through a non-linear time-history analysis, versus the scaled intensity of different input earthquakes. The seismic intensity is often measured through the spectral acceleration at the fundamental elastic...

Many school buildings in seismic zones have been built without code, or with old requirements. These buildings could be vulnerable to destructive earthquakes or, even, suffer significant damage under frequent earthquakes. Then, it is necessary to develop retrofit strategies for these constructions that have a particularly important use. Given the i...

En la actualidad, se están implementando nuevas metodologías de trabajo en la industria de la Arquitectura, Ingeniería y Construcción (AIC), las que ofrecen una gran cantidad de beneficios para el flujo de trabajo de los proyectos del rubro. Tradicionalmente, las distintas áreas realizan sus labores de forma bastante independiente, lo que genera pr...

This paper investigates the effect of earthquake ground motion duration on the seismic response of a low-rise reinforced concrete shear wall building. Two sets of spectrally equivalent ground motion sets were determined to isolate the effect of duration from other earthquake record characteristics. A numerical model that accounts for P-delta effect...

Nowadays, the need to the seismic assessment of the performance existing structures is well recognized, in order to find solutions that mitigate the destructive effects of earthquakes both on people and on structures and contents. One of the cases of greatest interest to carry out this type of evaluation is that corresponding to educational buildin...

Building Information Modeling (BIM) allows the integration of work teams, collaboration, and the generation of intelligent parametric digital models. Therefore, because BIM is a collaborative working methodology, it is not possible to effectively teach BIM without the use of collaborative teamwork. Traditionally, teaching at universities has promot...

Post-seismic reinforcement is extensively used to repair structural elements of buildings hit by strong earthquakes, while pre-seismic reinforcement can be very convenient to improve the seismic performance of buildings designed according to less stringent standards than current. One of the most commonly used techniques for both pre and post-seismi...

The progress of the study of seismic vulnerability has allowed the formulation of new assessment methodologies, which take into account not only the behaviour of the structural and non-structural elements, but also the components that, due to their importance and cost, can represent an investment that in some cases becomes greater than the cost of...

Building information modelling (BIM) is a methodology that is increasingly gaining strength in the architecture, engineering and construction industry. Building information modelling is focused on the effective collaboration and interaction of teams. It is for this reason that many classrooms around the world have decided to teach BIM to engineerin...

Although still little used in practice, the non-linear time-history (NlTH) analysis is the most powerful method to design new earthquake-resistant buildings. This kind of analysis may even help the designer to assess the seismic performance of existing buildings and suitably plan their retrofit. With reference to a pre-seismic-code r/c building and...

El uso de herramientas informáticas para resolver cálculos en cualquier área de estudio es esencial para reducir el tiempo dedicado a realizarlas, dando lugar a la inversión de tiempo en el análisis del problema para un número "n" de soluciones al problema propuesto, pudiendo realizar iteraciones múltiples hasta alcanzar un resultado óptimo. El obj...

El análisis, diseño y documentado de estructuras es un proceso complejo y dinámico, retroalimentado por diversos profesionales y desarrollado en distintos programas computacionales. Toda esta diversidad de factores confluye dentro de un proceso iterativo de ensayo-error, que no se detiene hasta lograr un modelo refinado (equilibrio entre normativa...

Structural engineering companies (SECs) currently have a series of deficiencies that hinder their processes and interactions, decreasing their productivity, lacking collaborative and interconnected processes, not including current work methodologies such as building information modeling (BIM). The BIM methodology seeks to integrate processes and pr...

The use of building information modelling (BIM) strengthens collaboration and reduces fragmentation in architecture, engineering and construction (AEC) industry projects, improving performance and reducing costs. For this, not only the incorporation of technologies is required, but also a social change in the way in which the professionals of the a...

In current educational processes, it is common to find that students make use of oral presentations with the purpose of exposing a specific topic within the contents of a subject. These types of presentations are also intended for students to learn or improve oral presentation techniques, which generally enrich their communication skills. However,...

La industria de la Arquitectura, Ingeniería y Construcción (AIC) es relevante para el desarrollo del país, sin embargo, en las últimas décadas posee bajos niveles de productividad, dados en gran medida por la fuerte fragmentación existente entre los agentes involucrados. Ante esto, hoy la industria se está modernizando, implementando metodologías y...

En la medida que más se conozca el marco teórico de la conexión precalificada BFP Bolted Flange Plate se diseñará de mejor forma, razón por la cual en este artículo se presenta con cierto detalle, en 17 pasos, el diseño de esta conexión que es muy adecuada para zonas de alta peligrosidad sísmica.El marco teórico se complementa con el desarrollo de...

As the theoretical framework of the BFP Bolted Flange Plate pre-qualified connection is better known, it will be better designed. Consequently, in this paper it is presented in some detail this connection type, summarized in 17 steps. The design of this connection is recommended for steel buildings designed for areas with high seismic hazard. The t...

The main objective of this research is to develop a program capable of analyzing and checking the design of double-T type metallic connections based on the ANSI / AISC 358-16 standard under four different types of nodes depending on their location within a structure of steel. The execution of this program was carried out through a programming langu...

Irregular structures can lead to undesirable behavior under strong ground motions. For this reason, the seismic codes prescribe a series of recommendations that seek to limit the irregularity. For the specific case of plant irregularity, recommendations aim to limit the eccentricity, so limiting torsional moments, which have been identified as the...

Current procedures of analysis and seismic design of structures are conducted considering elastic be-havior. This consideration is possible assuming that the seismic forces are lower than the corresponding ones obtained from the elastic design spectrum prescribed by the seismic code. These forces are com-puted Response Reduction Factors, which are...

Some residential buildings are irregular, having plants with entrances, fact which can worsen their behavior during potential seismic events. They can present demands that are much higher than their design capacity. The objective of this monograph is to study the seismic performance factors of buildings by applying the FEMA P695 methodology to a se...

RESUMEN El diseño sismorresistente vigente se fundamenta en los resultados del análisis elástico de las estructuras, a pesar de que en la actualidad el análisis no lineal es cada vez más asequible. Para realizar el análisis sísmico de estructuras que se modelan con comportamiento elástico, pero que se conoce incursionarán en comportamiento plástico...

Displacement ductility is a parameter that characterizes the seismic response of structures. Moreover, displacement ductility can be used in order to determine whether a structural design, performed according to a specific seismic code or not, may achieve the main goal of the seismic design: to develop energy dissipation in a stable manner. Determi...

Oral presentations are an increasingly used tool in the field of high school and university education. This tool is often used without taking full advantage of all its potentialities, especially those that have to do with the training of lecturers and, specially, with the positive impact it has on the audience. This article reports the results of a...

RESUMEN En la enseñanza de la ingeniería, se ha vuelto cada día más frecuente el uso de presentaciones orales de los estudiantes para abordar diversos temas afines a la asignatura. Dicha instancia surge bajo la expectativa del docente de poder implementar otras formas de aprendizaje en los estudiantes y con ello desarrollar habilidades de trabajo e...

En las instituciones de educación superior se utiliza la clase magistral como principal instancia de enseñanza. Éste, en numerosas ocasiones, se complementa con exposiciones orales de los estudiantes, donde ellos se ven enfrentados al desafío de presentar frente a un grupo numeroso de personas, investigar y preparar un tema, además de desenvolverse...

Lessons learned in past earthquakes show that the catastrophic failure of many buildings has been due to their irregularity. For this reason, most seismic-resistant design codes prescribe a series of recommendations that attempt to limit the irregularity of structures. One of the most common types of irregularities in buildings is plan irregularity...

Displacement ductility is a parameter that characterizes the seismic response of structures. Moreover, displacement ductility can be used in order to determine whether a structural design, performed according to a specific seismic code or not, may achieve the main goal of the seismic design: to develop energy dissipation in a stable manner. There i...

Las vigas de acero con sección transversal tipo “I” son muy utilizadas en las construcciones, por lo que se decidió escribir este artículo para presentar en primer lugar el formulario con el que se obtiene las propiedades de una sección con una explicación detenida de los módulos elástico y plástico. Posteriormente, se indica con detalle el cálcul...

RESUMEN Para aquellas estructuras que requieren refuerzo existen diversidad de técnicas para solucionar este problema, presentándose como alternativa la fibra de carbono. Este artículo presenta el estudio del comportamiento del nodo exterior viga-columna en Hormigón armado reforzada con polímero de fibra de carbono (CFRP), sometida a cargas cíclica...

RESUMEN Las vigas de acero con sección transversal tipo " I " son muy utilizadas en las construcciones, por lo que se decidió escribir este artículo para presentar en primer lugar el formulario con el que se obtiene las propiedades de una sección con una explicación detenida de los módulos elástico y plástico. Posteriormente, se indica con detalle...

El análisis incremental dinámico se ha empleado en el último tiempo para determinar la máxima resistencia de edificios sometidos a terremotos de intensidad variable. Esta variación se logra incrementado progresivamente las amplitudes de los acelerogramas empleados como excitación dinámica. En este trabajo se aplica este procedimiento numérico de ev...

EDITORIAL La investigación amerita desde cualquier punto de vista, que el conocimiento generado esté disponible ante la sociedad científica, y difundirse para estar sujeto al juicio de la comunidad profesional e investigadora, promoviéndose así el intercambio de dicho conocimiento. El problema estriba en que si los trabajos son publicados solamente...

Book review of: SEISMIC ANALYSIS OF STRUCTURES, Author: T. K. DATTA. JOHN WILEY AND SONS (ASIA): SINGAPORE, 2010. ISBN: 9780470824610

In the earthquake resistant design of buildings, it is necessary to know a priori the value of the ductility that these will be able to reach when they are affected by strong ground motions. These values are available in the seismic design codes, but their estimation can be also made by using expert's opinion or the actual response of the buildings...

Nowadays the seismic design is based on the results of elastic analysis of structures (indeed of the growth of the non-linear based procedures). In order to perform the analysis of structures which are modeled with elastic behavior, although the engineer knows that they could reach plastic behavior, seismic design codes prescribe the reduction of e...