Andrés Felipe Alonso Rodriguez

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• PhD in Earthquake Engineering and Engineering Seismology
• Research Lecturer at La Gran Colombia University

Interstory drift and floor acceleration demands in buildings subjected to near-fault pulse-like ground motions are investigated by means of simplified building and ground motion models. A pulse model proposed by Mavroeidis and Papageorgiou is used to represent near-fault ground motions. Similarly, a continuous model formed by a flexural beam latera...

Seismic amplification characteristics of ground motion are influenced by the geotechnical properties of soil deposits and the associated uncertainties. Geotechnical systems are often represented with deterministic models, both for the soil parameters and for their spatial distribution. However, a deterministic ground response analysis does not allo...

Two successive landslides within a month started in October 11, 2018, and dammed twice the Jinsha River at the border between Sichuan Province and Tibet in China. Both events had potential to cause catastrophic flooding that would have disrupted lives of millions and induced significant economic losses. Fortunately, prompt action by local authoriti...

This study provides an extensive analysis of Reduced Web Section (RWS) connections as a seismic retrofit strategy aimed at enhancing structural safety and sustainability in steel structures. RWS connections, which introduce perforations in the web of steel beams, offer a sustainable alternative to traditional Reduced Beam Section (RBS) connections...

Brittle tearing failure is one of the most dangerous failure modes in moment-resistant connections. Hence there has been successful research in developing fuse strategies that cluster deformation demand away from the column face, well within the beam. However, this approach involves the extensive intervention of the column and provision of stocky s...

This paper presents an experimental study of demountable steel-concrete composite reduced web section (RWS) connections for use in seismic areas. Four composite connection specimens were subjected to sagging and hogging moments to investigate the performance of RWS connections under reversible actions. For such purpose, a single web opening was cre...

This paper presents an experimental study of demountable steel-concrete composite reduced web section (RWS) connections for use in seismic areas. Four composite connection specimens were subjected to sagging and hogging moments to investigate the performance of RWS connections under reversible actions. For such purpose, a single web opening was cre...

This paper presents an experimental study on demountable steel-concrete composite reduced web section (RWS) connections for use in seismic areas. Four composite connection specimens were subjected to sagging and hogging moments to investigate the performance of RWS connections under reversible actions. For such purpose, a single opening was made ne...

Whilst there has been research about reduced web section beams; RWS, their seismic behaviour when they are overlaid by slabs is not well understood. This study addresses this by assessing a high-definition finite element repre-sentation of non-seismically detailed RWS connections with slabs. The com-posite action is investigated, focusing on effect...

Gully erosion is widespread in central China's ecologically fragile loess plateau. However, research on the monitoring and evaluation of large-scale erosion is scarce. Here, we collected 16 pairs of Sentinel-1A images from the rainy season, spanning April 5-October 26, 2019, subsidence is then quantified and its results can indirectly reflect the i...

Gully erosion is widespread in central China's ecologically fragile loess plateau. However, research on the monitoring and evaluation of large-scale fine erosion is scarce. Here, we use the sentinel-1A imagery during a rainy season, using the small baseline subset synthetic aperture radar interferometry (SBAS-InSAR) technology to calculate gully er...

Softening of beams near the moment connection can be regarded as one of the most convenient methods for retrofitting non-seismically designed buildings. This can be done by drilling the beam web near the connection (aka RWS–Reduced Web Section) or cutting the beam flanges (aka RBS–Reduced Beam Section). Thus, becoming a cost-effective option for re...

The use of perforated (in particular cellular and castellated) beams has become widespread as their manufacturing processes keep minimising wasted material and has become cost-effective by reducing self-weight of steel structures, while allowing for larger clear spans. Although their behaviour to time-invariant vertical loads has been extensively i...

In this article, a widely used building model, comprised of uniform coupled flexural and shear beams, herein improved by allowing for the effects of rotational inertia. Closed-form solutions in terms of trigonometric and hyperbolic functions are obtained, allowing for the explicit formulation of period ratios, modal participation factors (MPFs), mo...

The fluctuation of water level in the Three Gorges Reservoir is up to 30 m, and the reservoir water fluctuation zone is the important channel of reservoir water flowing in and out of a landslide. The permeability characteristics and parameters of the reservoir water fluctuation zone of landslide bodies are of great significance for calculating the...

This paper describes how a wavelet model comprised of a linear combination of sine terms is capable of repre-senting the cross-section inertia variation along the length of cellular beams. This allows for the efficient compu-tation of deflections of cellular beams while being deployed as part of steel-concrete composite flooring systems, without co...

This study presents assessments on the spatial variability of a soil landslide in the three gorges reservoir in China. Results challenge the idea that variability of permeability within a landslide is secondar. Consequently, it can't be assessed through single representative values. It was found that its variability spans two orders of magnitude, a...

The characteristics and hysteresis of seepage are critical for assessing the stability of creeping soil landslides after reservoir impoundment. First, field and laboratory tests were conducted to obtain the saturated permeability coefficient of 396 soil landslides within the Three Gorges Reservoir area and trends among these results were obtained t...

The 2018 Hokkaido Eastern Iburi Mw 6.6 earthquake occurred on September 6, 2018. It triggered a large amount of slope failures near the towns of Atsuma, Mukawa, and Abira, which caused more than 80% of the casualties. This study presents an inventory of 7837 coseismic landslides based on the interpretation of the PlanetScope images, covering about...

Poster presentation in the event "Building Resilience to Disasters Using Financial Instruments" sponsored by NERC, UKaid and ESRC.

This paper presents a simplified model using coupled Bernoulli and shear beams supported by Winkler-type springs for system identification of tunnels subjected to earthquake-induced ground motions. The model formulation is introduced and closed-form solutions to the modal characteristic equation and mode shapes are derived. The latter are verified...

It presents an outline of simplified models with closed-form solutions for assessing the response of the built environment to earthquake actions

Overview of the shaking Tunnel Vision Project

A simplified model useful for assessing economic losses due to moderate seismicity events in urban areas has been developed by studying the behavior of buildings before yielding their structural system, allowing for nonuniform stiffness along their height. In particular, buildings are modeled as cantilever shear beams with uniform mass and paraboli...

A novel model for assessing building behavior has been developed by coupling a Bernoulli beam with a quartic stiffness variation and a shear beam with a parabolic stiffness variation, trends that are expected in buildings designed for earthquake actions. Then the partial differential equation of motion governing the behavior of the model has been s...

I present a simplified model to understand how buildings behave when subjected to earthquakes

A novel model for assessing building behavior has been developed by coupling a Bernoulli Beam with a quartic stiffness variation and a shear beam with a parabolic stiffness variation, trends that are expected in buildings designed for earthquake actions. Closed form solutions in terms of Legendre Functions were obtained and validated with Finite El...

En este artículo se introduce el uso de soluciones cerradas en ingeniería sísmica mostrando su utilidad en el estudio de la respuesta de edificios, en particular las demandas de aceleración y deriva de piso. Basados en una representación del movimiento cercano a la falla desarrollada por Mavroeidis y Papagerogiou (MP), los autores estudian paramétr...

An evaluation of interstory drifts and acceleration demands in multi-story buildings responding elastically when subjected to near-fault motions is presented. Peak interstory drift demands and acceleration peak floor demands are vital in the assessment of the onset of structural damage and loss potential for buildings contents. Mavroeidis Papageorg...

Extensive economical loss and downtime occurs in buildings as a result of earthquakes, even when responding elastically or nearly elastically. For example, most frame buildings of both steel and concrete initiate yielding at inter-story drift ratios somewhere between 0.8% and 1.2%, while masonry infills and interior gypsum wallboard partitions expe...

Closed form solutions are worth considering because • they allow to fully describe many aspects of the dynamic characteristics of complex multi degree of freedom systems (e g buildings) with a very small number of parameters • They are based on fundamental principles (e g equilibrium, mechanics) and therefore lead to a transparent approach to descr...