Dynamic characterization of a heritage construction from 19th century

Abstract

Heritage constructions presents high significance and importance for society. As way of contribution for the preservation of the heritage constructions, this paper presents a study on the dynamic behavior of a heritage construction, part of the historic center of Sobral city, located at the north region of Ceará State, namely the Nossa Senhora das Dores Church, a church from the beginning of the 19th century, built in clay brick walls. In this study, ambient vibration tests were performed aiming to obtainment of the natural frequencies of the building focusing the calibration of the numerical model and, from it, proceeding with modal analysis by Finite Element Method (FEM) with recurrence to software Ansys®. The results allowed the analysis of the structural dynamic behavior taking into account natural frequencies, modal shapes and directional displacements.

Seismic Behavior Assessment of a Brazilian Heritage Construction

“…It is worth noting that, after calibrating the Young's Modulus in order to reproduce the first numerical natural frequency, a good adherence between experimental and numerical results was also obtained for the second and third frequency, denoting that the numerical model reproduces correctly stiffness and masses of the church. In literature is rather usual the use of ambient vibration testing information for calibration of numerical models, summarizing the natural frequencies information about the modal parameters of the structure [34,35,36,37,38,39]; usually, an error between experimental and numerical results up to about 5 % is considered acceptable. In the present calibration the biggest error -obtained as the difference between the natural frequency of the structure extracted by ambient vibration test and the natural frequency extracted by numerical analysis -was 2.6 %, therefore the calibration has been considered successful (taking into account both the aim of the numerical model and its refinement Analyzing the numerical modal shapes of the church (Fig.…”

Methodologies for assessing the structural integrity of historic masonry domes and vaults

“…The first local mode of the dome (51.44 Hz) corresponds to a vertical mobilization of the center of the dome, which appears as a very rigid element. The average error between the numerical and experimental results of the frequencies is 7.8% with the initial values adopted for the material properties, with an error of up to 5% being considered acceptable [81]. Judging that this error is due to the complexity of the construction, the simplifications adopted in the numerical model and the parameters involved in the calibration, it becomes necessary to calibrate the model properties of the most relevant materials.…”

Caracterização de perfis de umidade ascensional em revestimentos argamassados tradicionais

“…A preservação do patrimônio e das construções históricas (CH) está condicionada à análise profunda da estrutura em diferentes aspectos, como geometria, características construtivas e propriedades dos materiais (BOSCATO et al, 2016) . Conhecer o estado de conservação dessas construções permite identificar os danos existentes, bem como a estratégia de intervenção mais adequada, uma vez que essas edificações podem apresentar heterogeneidade nos métodos construtivos, características estruturais e materiais utilizados (BRANDÃO et al, 2018;HANSEN et al, 2017;NETO;MARTINI;MESQUITA, 2017), complexidade geométrica, ausência de informações acerca dos materiais utilizados e do comportamento dos elementos que as constituem (ALMEIDA, 2013;SANTOS et al, 2016). Assim como os demais tipos de estruturas, as CH estão sujeitas a variados quadros de degradação, podendo essas variações serem causadas por ações antrópicas (alterações na edificação e no ambiente externo), eventos naturais (variações térmicas e ataques químicos) e ações dinâmicas, como vento e sismos (BRANDÃO et al, 2018).…”