COMPARISON BETWEEN STATIC AND DYNAMIC LOAD TEST APPLIED TO A STEEL-CONCRETE MIXED BRIDGE STRUCTURE
Maíra Rolla Campos1; Clarissa Rafaela Pinto2; Cláudio José Martins1
1 Centro Federal de Educação Tecnológica de Minas Gerais; 2 Universidade Federal de Viçosa
doi:10.20906/CPS/CILAMCE2017-0317
Resumo
Civil engineering structures are impacted by various types of actions, which can introduce behaviors characterized by static and/or dynamic responses. The actions that give rise to static responses remain constant over time while the causes of dynamic responses vary their amplitude and/or position. For a long time, monitoring of the behavior of the structures in civil engineering throughout its life cycling was carried out using only static analyzes. However, many methods have been proposed contributing to the advance of dynamic theory, and can be applied in several structures, including bridges, that are susceptible to dynamic problems due to vehicle movement and wind action.. This work aims to validate the dynamic load test performed using the modal analysis, comparing the results obtained with the static load test of a bridge located between the cities of Sebiu and Bintulu, in the province of Serawak, Malaysia. The bridge has a total length of 57.6 m and consists of a mixed system of steel and reinforced concrete. The dynamic load test was performed with natural vibrations caused by wind and traffic. The measurement of these vibrations is made by reccording the accelerations at six different points without interrupting traffic. From the measured values, signal processing techniques are used to extract experimental modal parameters (damping, natural frequencies and their respective modes), necessary for the development of a numerical model based on the finite element method, capable of characterizing the real structure. The static load test was performed in order to compare its results with those obtained in the dynamic test. In the static test, trucks loaded with cement blocks with a maximum weight of 630 KN were used, positioned on the platform of the bridge to measure bending, shearing and deflection. The comparison between the maximum deflection results for the two methods presented a difference of 1.22 mm for the studied range (20% in relation to the numerical simulation). It can be con
Palavras-chave: dynamic load test; operational modal analysis; static load test; vibration analysis of mixed bridges