Nota sobre o cálculo de impulsos activos sísmicos
DOI:
https://doi.org/10.14195/2184-8394_159_4Palabras clave:
impulsos activos, impulsos sísmicos, equilíbrio limiteResumen
Para muros de suporte gravidade suportando aterros sem coesão, analisa-se uma limitação da validade dos métodos de Coulomb e Mononobe-Okabe para calcular impulsos activos estáticos e sísmicos determinados através de forças estáticas equivalentes. Mostra-se que para inclinações do tardoz dos muros de suporte superiores a dado valor, esses métodos clássicos não são válidos, formando-se um mecanismo diferente do considerado naqueles métodos. Apresenta-se uma metodologia simples para determinar os impulsos de terra activos em função da inclinação do tardoz da estrutura de suporte.
Descargas
Citas
Antão, A. N.; Santana, T.; Vicente da Silva, M.; Guerra, N. M. C. (2011). Passive earth-pressure coefficients by upper-bound numerical limit analysis. Canadian Geotechnical Journal, 48(5), pp. 767–780. https://doi.org/10.1139/t10-103.
Antão, A. N.; Santana, T.; Vicente da Silva, M.; Guerra, N. M. C. (2016). Three-dimensional active earth pressure coefficients by upper bound numerical limit analysis. Computers and Geotechnics, 79, pp. 96–104. https://doi.org/10.1016/j.compgeo.2016.05.022.
Barghouthi, A. F. (1990). Active earth pressure on walls with base projection. ASCE Journal of Geotechnical Engineering, 112(7), pp. 727–745. https://doi.org/10.1061/(ASCE)0733-9410(1990)116:10(1570).
Barros, P. L.; Santos, P. J. (2012). Coefficients of active earth pressure with seepage effect. Canadian Geotechnical Journal, 49(6), pp. 651–658. https://doi.org/10.1139/t2012-020.
Collins, L. F. (1973). A note on the interpretation of coulomb’s analysis of the thrust on a rough retaining wall in terms of the limit theorems of plasticity theory. Géotechnique, 23(3), pp. 442–447. https://doi.org/10.1680/geot.1973.23.3.442.
Coulomb, C. A. (1776). Essai sur une application des règles des maximis et minimis à quelques problèmes de statique relatifs à l’architecture. Mem. Acad. Roy., 7, p. 38.
Evangelista, A.; Scotto di Santolo, A.; Simonelli, A. L. (2010). Evaluation of psudostatic active earth pressure coefficient of cantilever retaining walls. Soil Dynamics and Earthquake Engineering, 30(11), pp. 1119–1128. https://doi.org/10.1016/j.soildyn.2010.06.018.
Fang, Y.; Yang, Y.; Chen, T. (2003). Retaining walls damaged in the Chi-Chi earthquake. Canadian Geotechnical Journal, 40(6), pp. 1142–1153. https://doi.org/10.1139/t03-055.
Greco, V. R. (1992). Discussion of Active earth pressure on walls with base projection (Barghouthi, 1990). ASCE Journal of Geotechnical Engineering, 118(5), pp. 825–827. https://doi.org/10.1061/ (ASCE)0733-9410(1992)118:5(825).
Greco, V. R. (1999). Active thrust on cantilever walls in general conditions. Soils and Foundations, 39(6), pp. 65–78. https://doi.org/10.3208/sandf.39.6_65.
Greco, V. R. (2001). Pseudo-static thrust on cantilever walls. Soils and Foundations, 41(3), pp. 87–92. https://doi.org/10.3208/sandf.41.3_87.
Kim, W.-C.; Park, D.; Kim, B. (2010). Development of a generalised formula for dynamic active earth pressure. Géotechnique, 60(9), pp. 723–727. https://doi.org/10.1680/geot.09.T.001.
Kloukinas, P.; Mylonakis, G. (2011). Analysis of seismic earth pressures: some recent developments. Proceedings of the ERTC-12 Workshop on evaluation of EC-8, XV European Conference on Soil Mechanics and Geotechnical Engineering, Athens, Greece.
Koseki, J.; Tatsuoka, F.; Munaf, Y.; Tateyama, M.; Kojima, K. (1998). A modified procedure to evaluate active earth pressure at high seismic loads. Soils and Foundations, Special Issue, pp. 209–216. https://doi.org/10.3208/sandf.38.Special_209.
Loukidis, D.; Salgado, R. (2012). Active pressure on gravity walls supporting purely frictional soils. Canadian Geotechnical Journal, 49(1), pp. 78–97. https://doi.org/10.1139/t11-087.
Loureiro, G.; Guerra, N.M.C.; Almeida e Sousa, J. (2014). Acções sobre muros de suporte em consola. Geotecnia, 132, pp.69–92. https://doi.org/10.24849/j.geot.2014.132.05.
Mononobe, N.; Matsuo, H. (1926). On the determination of earth pressures during earthquakes. Proceedings of the World Engineering Conference, volume 9, pp. 177–185. Em japonês; obra não consultada directamente.
Müller-Breslau, H. (1906). Erddruck auf Stützmauern. Kroener, Stuttgart. Em alemão; obra não consultada directamente.
Okabe, S. (1926). General theory of earth pressure. Journal of the Japanese Society of Civil Engi- neers, 12(1), pp. 123–134. Em japonês; obra não consultada directamente.
Rankine, W. J. M. (1857). On the stability of loose earth. Phil. Trans. Royal Soc.
Santana, T.; Guerra, N. M. C.; Antão, A. N.; Vicente da Silva, M. (2013). Three-dimensional seismic active earth pressure coefficients using upper bound numerical limit analysis: a few preliminary results. Proceedings of the 18th International Conference on Soil Mechanics and Geotechnical Engineering, Challenges and Innovations in Geotechnics, pp. 1579–1582, Paris. Presses des Ponts. https://www.issmge.org/uploads/publications/1/2/1579-1582.pdf.
Tatsuoka, F.; Tateyama, M.; Koseki, J. (1996). Performance of soil retaining walls for railway embankments. Soils and Foundations, Special Issue, pp. 311–324. https://doi.org/10.3208/sandf. 36.Special_311.
Watanabe, K.; Koseki, J.; Tateyama, M. (2011). Seismic earth pressure exerted on retaining walls under a large seismic load. Soils and Foundations, 51(3), pp. 379–394. https://doi.org/10.3208/ sandf.51.379.
Xinggao, L.; Weining, L. (2010). Study on the action of the active earth pressure by variational limit equilibrium method. International Journal for Numerical and Analytical Methods in Geomecha- nics, 34(10), pp. 991–1008. https://doi.org/10.1002/nag.840.
Yang, X.-L. (2007). Upper bound limit analysis of active earth pressure with different fracture surface and nonlinear yield criterion. Theoretical and Applied Fracture Mechanics, 47(1), pp. 46–56. https://doi.org/10.1016/j.tafmec.2006.10.003.
Yonezawa, T.; Yamazaki, T.; Tateyama, M.; Tatsuoka, F. (2014). Design and construction of geosynthetic-reinforced soil structures for hokkaido high-speed train line. Transportation Geotech- nics, 1, pp. 3–20. https://doi.org/10.1016/j.trgeo.2013.12.001.
