MODAL IDENTIFICATION OF A HEAVILY DAMAGED NINE-STORY STEEL-REINFORCED CONCRETE BUILDING BY AMBIENT VIBRATION MEASUREMENTS

The effects of seismic actions on reinforced concrete (RC) structures are strongly influenced by the dynamic behavior of their materials. It is crucial to find a simple definition of the natural frequencies of reinforced concrete buildings, particularly in relation to both principal and secondary elements constructing the reinforced concrete building type. This paper firstly presents a comparison with the ambient vibration surveys. An analysis model of different stages of construction of the reinforced concrete masonry wall was compared using the finite element software. In the second step, structural responses of the model were investigated by means of static analysis. Three main types were examined: Bare frame for one, two and three storeys; brick-walled; and coated cases. Modal analysis is carried out by ABAQUS software starting from the deformed building, to provide the natural frequencies and mode shapes. For the natural frequencies, a good agreement is obtained between analytical and experimental results. Furthermore, the comparison results between different cases show that the application of the plaster work increases the lateral stiffness and has significant effects on the dynamic response of the buildings.

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Structural Health Monitoring of a Reinforced Concrete Building during the Severe Typhoon Vicente in 2012

The Scientific World JOURNAL ◽

10.1155/2013/509350 ◽

2013 ◽

Vol 2013 ◽

pp. 1-12 ◽

Cited By ~ 11

Author(s):

Sin-Chi Kuok ◽

Ka-Veng Yuen

Keyword(s):

Reinforced Concrete ◽

North Pacific Ocean ◽

Structural Response ◽

Tropical Storm ◽

Modal Identification ◽

Structural Performance ◽

Reinforced Concrete Building ◽

Concrete Building ◽

Time Histories ◽

Wind Characteristics

The goal of this study is to investigate the structural performance of reinforced concrete building under the influence of severe typhoon. For this purpose, full-scale monitoring of a 22-story reinforced concrete building was conducted during the entire passage process of a severe typhoon “Vicente.” Vicente was the eighth tropical storm developed in the Western North Pacific Ocean and the South China Sea in 2012. Moreover, it was the strongest and most devastating typhoon that struck Macao since 1999. The overall duration of the typhoon affected period that lasted more than 70 hours and the typhoon eye region covered Macao for around one hour. The wind and structural response measurements were acquired throughout the entire typhoon affected period. The wind characteristics were analyzed using the measured wind data including the wind speed and wind direction time histories. Besides, the structural response measurements of the monitored building were utilized for modal identification using the Bayesian spectral density approach. Detailed analysis of the field data and the typhoon generated effects on the structural performance are discussed.

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