The coulombs theory is further extended to evaluate seismic active earth pressure considering c. Similar to the coulomb theory, the mo theory assumes a planar slip. Chapter 14 a procedure for seismic design of retaining walls. This method applies earthquake force components using two coefficients called seismic horizontal and vertical coefficients. Application of mononobeokabe equations with high acceleration andor high. The mononobeokabe mo method is based on coulombs theory of static soil pressures and was originally developed for gravity walls retaining cohesion less backfill materials. Therefore, the results are true in its assumption range only, and in many. An alternative to the mononobeokabe equations for seismic. Professor in charge of thesis on behalf of the advisory committee approved. Seismic earth pressures on retaining structures in cohesive soils. Seismic design of earth retaining structures by atop lego, m. Mononobe okabe theory continuum mechanics force scribd.
The method is first validated against the solutions of mononobeokabe and richards and elms for the seismic stability of retaining walls, and then used to study the effect of a wider range of. A shikaisen from ancient japanmononobe no futo is a shikaisen, formerly a hermit practicing taoism. Comparison of pseudostatic and pseudodynamic methods. The eurocodes consider the seismic actions in eurocode 8 ec 8 and recommend the use of the mononobeokabe method when dealing with soil retaining structures. Formulation of seismic active earth pressure of inclined. Pioneering works on seismic earth pressure on a rigid retaining wall have been reported by okabe 1924 and mononobe and matsuo, 1929, mononobe and matsuo, 1932. Hidefusa okabe1, elizabeth riley1,2, laura germine3, jeremy wilmer4, michael esterman1,5, joseph degutis1,2 1 geriatric research education and clinical center grecc, va boston healthcare system, boston, massachusetts, 02 2 harvard medical school, cambridge, massachusetts, 02115. Appendix a, application of mononobeokabe equations with high acceleration andor high backslope angle has been added, which provides commentary and graphs for the estimation of k ae. The retaining walls guidance is supplementary to the guidance document repairing and rebuilding houses affected by the canterbury earthquakes. The mononobe okabe method mononobe and matsuo 1929.
Pdf an alternative to the mononobeokabe equations for. Research article extended mononobeokabe method for. Lai 23 and mario martinelli 4 abstract the essence of performancebased design of gravity earthretaining walls grw lies in the estimation of the residual displacements following a given seismic event. Mri of cervical intervertebral discs in asymptomatic subjects. Extension of mononobeokabe approach to unstable slopes. This method has generally been used for cohesionless soils only. In a very broad sense, spaces are objects of study in geometr. Mononobeokabe method mo, a seismic version of coulomb theory, was proposed based on pseudostatic earthquake loading for granular soils. The classical equations of coulomb,, and mononobeokabe,,, are being widely used for determining earth pressures due to gravitational and earthquake loads, respectively. Mononobe n, matsuo h 1929, on the determination of earth pressure during earthquakes.
Static and dynamic active earth pressure springerlink. These kinds of theories propose a coefficient which is a ratio between horizontal and vertical stress behind retaining walls. Participating in many of the pacific war battles and campaigns as a member of several units, okabe was officially credited with destroying 15 enemy aircraft. Phonetic evidence for the development of the acute tone. Missouri university of science and technology scholars mine. These moments are higher than mononobeokabe method, sighting mononobeokabe methods limitation. Pdf an alternative to the mononobeokabe equation for seismic. The mononobeokabe solution treats earthquake loads as pseudodynamic, generated by uniform acceleration in the backfill. The classical equations of coulomb 14,10 and this expectation does not seem to diminish by the advent mononobe okabe 511.
Professional duties and the uncooperative hivinfected client mindie r. The set of common facilities contains names, procedures, applications, exception mechanisms, mutable data structures, and possibly other forms of nonlocal. The sarma method is a method used primarily to assess the stability of soil slopes under seismic conditions. Extended mononobeokabe method for seismic design of. Comparison of pseudostatic and pseudodynamic methods for seismic earth pressure on retaining wall 2 vv max v h a a lim k p 2gtan g v v qww. Okabe was credited with shooting down eight enemy aircraft on 8 may 1942 during the battle of the coral. The estimation of seismic active earth pressure on retaining walls from backfill soils is an important problem in earthquake engineering. Okabe 1926 is commonly used to determine the magnitude and distribution of seismic pressure on a retaining wall. Worked examples to accompany seismic design in christchurch. First, he argued that all programming languages share a basic set of facilities for specifying computation but di. Pdf extended mononobeokabe method for seismic design.
Mononobeokabe mo method is still employed as the first option to estimate lateral earth pressures during earthquakes by geotechnical engineers. Seismic lateral pressures for design of rigid walls. Extension of mononobeokabe approach to unstable slopes by sara ebrahimi approved. Use of mononobeokabe equations in seismic design of retaining walls in shallow soils proc. Moreover, combining the data from all numerical simulations. Considering some simple assumptions and using a closed form method, mo solves the equations of equilibrium and suggests seismic active and passive lateral earth pressures. In addition to coulomb and rankines earth pressure theory, other theoretical. Compared to the coulomb and mononobeokabe equations, the proposed solution is. A general solution for the determination of total i. Journal of the japanese society of civil engineers, tokyo, japan 12 1.
Introduction the purpose of this paper is to discuss the ethics of confidentiality in the professions. Use of mononobeokabe equations in seismic design of retaining walls in shallow soils convenient method of determining seismic earth pressures acting on retaining walls. This cited by count includes citations to the following articles in scholar. The ones marked may be different from the article in the profile.
She possesses the ability to manipulate feng shui, and is from an old era of japan. The eurocodes consider the possibility of each european country to adopt their own seismic parameters as the seismic risk is. Use of mononobeokabe equations in seismic design of. Coulombs theory was generalized for cohesionless soils by muellerbreslau 3 to account for the frictional interaction between the retained soil and the wall face expressed by the angle. Mononobe and matsuo, and okabe mo proposed a method to determine lateral earth pressure of granular cohesionless soils during earthquake. Mononobeokabe extended the theory including earthquake loads introducing horizontal and vertical inertia forces for retaining wall having cohesionless backfill. It is found that the lateral wall responses obtained using the fe were larger than those calculated by the mononobeokabe method for all heights of the retaining wall, it was also found that pore pressure of the ground water depends on the water flow through the backfill during the earthquake. Gender differences in sustained attentional control are. It is a modification of coulombs classic earth pressure theory which takes into account the inertia forces on a potential sliding wedge caused by earthquake accelerations. The general theory of earth pressure proposed by okabe in 1926 okabe. Manga is the japanese word for comic, but in english it means japanese comics. Hence, combining equation 41 with the known static coefficient produces the seismic. Scribd is the worlds largest social reading and publishing site. Each profession has its own policy regarding confidential communications outlined in its ethical code.
Sarma in the early 1970s as an improvement over the other conventional methods of analysis which had adopted numerous simplifying assumptions. Naoko takeuchi was born to ikuko and kenji takeuchi on march 15, 1967 in the city of kofu, yamanashi prefecture, japan. Okabe 1926 and mononobe and matsuo 1929, which is popularly known as mononobeokabe mo method, following the great kanto earthquake of 1923. Wang 2000 used a method of horizontal slices for determining the active earth pressure distribution for static case for a rigid vertical retaining wall with horizontal backfill. Various publications differ on the magnitude of outward wall deformations. Mononobe okabe theory free download as excel spreadsheet. Seismic earth pressure development in sheet pile retaining. The mononobeokabe mo method is a pseudostatic approach, which. Using appropriate assumptions the method can also be employed for static slope stability analysis. Naoko takeuchi is best known as the creator of sailor moon, and her forte is in writing girls romance manga. Soilstructure interaction of retaining walls under. Mononobe okabe method mo, a seismic version of coulomb theory, was proposed based on pseudostatic earthquake loading for granular soils. Mononobeokabe earth pressure models okabe 5, mononobe and matsuo 1 were the pioneers to obtain the active and passive earth pressure coefficients under seismic conditions.
A critical study on seismic design of retaining structures. Kenji okabe, okabe kenji, born 1915 was an ace fighter pilot in the imperial japanese navy ijn during world war ii. Prev next modification of mononobeokabe theory authors. Itanagar introduction the problem of retaining soil is one the oldest in the geotechnical engineering. By combining these all, the range of realistic k was plotted against amax fig.
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