Seismic response of high plasticity clays during extreme events |
| |
| Affiliation: | 1. Clinical Medical College, Yangzhou University, Radiology Department, Subei People''s Hospital of Jiangsu Province, Yangzhou, China;2. Radiology Department, Huashan Hospital, Fudan University, Shanghai, China;1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China;1. Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional, Instituto Politécnico Nacional, Hornos 1003, Santa Cruz Xoxocotlán, Oaxaca, Mexico;2. Instituto Politécnico Nacional, Sección de estudios de posgrado e investigación, Escuela Superior de Ingeniería Mecánica y Eléctrica ESIME, Unidad profesional Adolfo López Mateos Zacatenco, Edificio 5 2º piso, Col. Lindavista, CP07738 Ciudad de México, México;3. Consultoría especializada en imagenología de recursos naturales renovables y no renovables y de materiales S. A. de C. V. Priv. De Rosales, 7, Reforma, 68050;1. Institut Montpelliérain Alexander Grothendieck (IMAG), UMR 5149, Université de Montpellier, F-34095 Montpellier cedex 5, France;2. IMAS-CONICET y Departamento de Matemática, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 1, 1428, Buenos Aires, Argentina;1. Key Lab of Structures Dynamic Behaviour and Control (Harbin Institute of Technology), Ministry of Education, Harbin 150090, Heilongjiang, China;2. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;3. Department of Civil Engineering, Technical University of Denmark, Kongens Lyngby, Denmark |
| |
| Abstract: | Mexico City high plasticity clays exhibit a small degree of nonlinearity for shear strains as large as 0.1%, which leads to both moderate shear stiffness degradation and small to medium damping increment, even for long duration subduction strong ground motions, such as the 8.1Mw 1985Michoacan earthquake. Nonetheless, current seismic design criteria of strategic infrastructure used worldwide have striven for having larger return periods for establishing the seismic environment, considering recent large magnitude (M>8.5Mw) events. This paper presents the study of the seismic response of typical high plasticity clays found in the so-called Texcoco Lake, in the surrounding of Mexico City valley, for larger to extreme earthquakes. The shear wave velocity profile was characterized using a down-hole test. The seismic environment was established from a set of uniform hazard response spectra developed for a nearby rock outcrop for return periods of 125, 250, 475 and 2475 years. A time-domain spectral matching was used to develop acceleration time histories compatible with each uniform hazard response spectrum. Both frequency and time domain site response analyses were carried out considering each seismic scenario. Ground nonlinearities were clearly observed in the soil response during extreme ground shaken, which increases rapidly with the return period. This fact must be taken into account to avoid costly and potentially unsafe seismic designs. |
| |
| Keywords: | Soil nonlinearities Extreme earthquakes High plasticity clay Strong shaking |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
