Seismic damage to structures in the Ms6.5 Ludian earthquake |
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Authors: | Hao Chen Quancai Xie Boyang Dai Haoyu Zhang Hongfu Chen |
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Affiliation: | 1.Key Laboratory of Earthquake Engineering and Engineering Vibration,Institute of Engineering Mechanics, CEA,Harbin,China;2.Earthquake Administration of Yunnan Province,Kunming,China;3.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics,China Earthquake Administration,Sanhe Langfang, Hebei,China |
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Abstract: | On 3 August 2014, the Ludian earthquake struck northwest Yunnan Province with a surface wave magnitude of 6.5. This moderate earthquake unexpectedly caused high fatalities and great economic loss. Four strong motion stations were located in the areas with intensity V, VI, VII and IX, near the epicentre. The characteristics of the ground motion are discussed herein, including 1) ground motion was strong at a period of less than 1.4 s, which covered the natural vibration period of a large number of structures; and 2) the release energy was concentrated geographically. Based on materials collected during emergency building inspections, the damage patterns of adobe, masonry, timber frame and reinforced concrete (RC) frame structures in areas with different intensities are summarised. Earthquake damage matrices of local buildings are also given for fragility evaluation and earthquake damage prediction. It is found that the collapse ratios of RC frame and confined masonry structures based on the new design code are significantly lower than non-seismic buildings. However, the RC frame structures still failed to achieve the ‘strong column, weak beam’ design target. Traditional timber frame structures with a light infill wall showed good aseismic performance. |
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