Cássio Gaspar

Pontifícia Universidade Católica do Rio de Janeiro · Department of Civil Engineering (CIV)

The study of the human‐structure interaction (HSI) using biodynamics models has gained attention lately. Several studies have demonstrated that the passive (standing still) and active (bobbing/bouncing or walking) persons can act for the benefit of the structural system by considering their body dynamic properties. Nevertheless, little concern has...

This work deals with a non-destructive approach based on dynamic testing combined with model updating techniques through finite element modelling and optimisation processes to characterise the main elastic constants of a thin-walled glass fibre reinforced polymer (GFRP) C-channel beam. The experimental modal analysis identified nine vibration modes...

In this work, an experimental and numerical study of the behavior of a tensegrity structure constructed with natural materials is presented. Firstly, it is shown the concept of tensegrity structures, highlighting its emergence, current context, and applications within Civil Engineering. The design of a bio-based tensegrity structural module is inve...

This paper addresses a theoretical investigation of the undamped free vibration of slender fiber-reinforced polymer (FRP) beams. While previous studies have focused on global vibration modes in the range of excitation frequencies reported in typical civil engineering problems, the present one discusses the influence of local modes, which can be use...

Strain Hardening Cement-based Composites (SHCC) holds great potential to be a remarkably effective material for shear strengthening of reinforced concrete beams in case of impact scenarios due to its great energy dissipation capability through the formation of multiple very fine cracks (∼100 μm of width). The effectiveness of this technique is inve...

The use of pultruded glass-fiber reinforced polymer (GFRP) has increased in recent years, with important applications for footbridges, bridge decks, cooling towers, among other. The mechanical characterization of GFRP in terms of elastic properties is often carried out by means of destructive static tests specified in international standards, but i...

Excessive vibration problems related to building floors concerning the human comfort have been reported by several researchers in the past two decades. The reason for those vibrations is mainly related with the current trend for the design of slender and flexible structural systems, with the inherent low damping. Consequently, such floors are prone...

p>This paper investigates the effect of crowd walking in the dynamic response of a footbridge. For this purpose, the modal parameters of a single walking pedestrian are identified on the basis of the measurement of the applied load and body acceleration. These parameters are then extended to the characterization of a crowd. Noticing that the mass r...

The main objective of this paper is to investigate the dynamic behaviour of building steel–concrete composite floors when submitted to human rhythmic activities. The investigated structural model was based on a real building steel–concrete composite floor spanning 40 m by 40 m with a total area of 1600 m2. The structural system represents a typical...

The main objective of this paper is to investigate the dynamic behavior of composite floors when subjected to human rhythmic activities. The investigated structural model was based on building composite floors and consisted of a typical interior bay of a commercial building, which is used as a gym. An extensive parametric study was developed focusi...

A growing number of structural problems associated with excessive vibrations of steel-concrete composite floors due to human rhythmic activities is the main motivation for the development of an analysis methodology supported by design guides and several researches to obtain the dynamic response of a steel-concrete composite floor spanning 40 by 40...

The structural problems related with excessive vibrations of steel-concrete composite floors due to human rhythmic activities is the main motivation for the development of an analysis methodology supported by design guides and several researches aiming to obtain the dynamic response of a typical steel-concrete composite floor spanning 10 by 10 m wh...

This research aims to perform an experimental and numerical assessment of an existing pedestrian footbridge located in the campus of the State University of Rio de Janeiro (UERJ), Rio de Janeiro/RJ, Brazil. The structural system is based on an internal reinforced concrete footbridge spanning 24.5m, constituted by concrete beams and slabs and being...

The main objective of this paper is to investigate the dynamic behaviour of building steel-concrete composite floors when subjected to human rhythmic activities. The investigated structural model was based on a steel-concrete composite floor spanning 10m by 10m, with a total area of 100m2. This system represents a typical interior floor bay of a co...