Cy chin, queenstown use of mononobeokabe equations in seismic design of retaining walls in shallow soils c y chin urs new zealand ltd. By combining these all, the range of realistic k was plotted against amax fig. Mononobeokabe method mo, a seismic version of coulomb theory, was proposed based on pseudostatic earthquake loading for granular soils. 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. This cited by count includes citations to the following articles in scholar. The classical equations of coulomb,, and mononobeokabe,,, are being widely used for determining earth pressures due to gravitational and earthquake loads, respectively.
Moreover, combining the data from all numerical simulations. Sarma in the early 1970s as an improvement over the other conventional methods of analysis which had adopted numerous simplifying assumptions. An alternative to the mononobeokabe equations for seismic. The mononobeokabe solution treats earthquake loads as pseudodynamic, generated by uniform acceleration in the backfill. The sarma method is a method used primarily to assess the stability of soil slopes under seismic conditions. Professor in charge of thesis on behalf of the advisory committee approved. 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. Kenji okabe, okabe kenji, born 1915 was an ace fighter pilot in the imperial japanese navy ijn during world war ii. Mononobe n, matsuo h 1929, on the determination of earth pressure during earthquakes. 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. Application of mononobeokabe equations with high acceleration andor high. Compared to the coulomb and mononobeokabe equations, the proposed solution is.
Worked examples to accompany seismic design in christchurch. The mononobe okabe method mononobe and matsuo 1929. This method has generally been used for cohesionless soils only. 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. First, he argued that all programming languages share a basic set of facilities for specifying computation but di. The general theory of earth pressure proposed by okabe in 1926 okabe. Naoko takeuchi was born to ikuko and kenji takeuchi on march 15, 1967 in the city of kofu, yamanashi prefecture, japan. Seismic earth pressures on retaining structures in cohesive soils.
Okabe was credited with shooting down eight enemy aircraft on 8 may 1942 during the battle of the coral. Journal of the japanese society of civil engineers, tokyo, japan 12 1. These moments are higher than mononobeokabe method, sighting mononobeokabe methods limitation. Seismic earth pressure development in sheet pile retaining. Formulation of seismic active earth pressure of inclined. Extension of mononobeokabe approach to unstable slopes. Use of mononobeokabe equations in seismic design of retaining walls in shallow soils convenient method of determining seismic earth pressures acting on retaining walls. Hence, combining equation 41 with the known static coefficient produces the seismic. 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. Pdf an alternative to the mononobeokabe equations for.
Mononobeokabe extended the theory including earthquake loads introducing horizontal and vertical inertia forces for retaining wall having cohesionless backfill. 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. 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. She possesses the ability to manipulate feng shui, and is from an old era of japan. Prev next modification of mononobeokabe theory authors. 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.
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. Missouri university of science and technology scholars mine. A general solution for the determination of total i. A critical study on seismic design of retaining structures. Okabe 1926 and mononobe and matsuo 1929, which is popularly known as mononobeokabe mo method, following the great kanto earthquake of 1923. Itanagar introduction the problem of retaining soil is one the oldest in the geotechnical engineering. Seismic lateral pressures for design of rigid walls. Mononobe and matsuo, and okabe mo proposed a method to determine lateral earth pressure of granular cohesionless soils during earthquake. Mononobe okabe theory free download as excel spreadsheet. Static and dynamic active earth pressure springerlink. 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.
Naoko takeuchi is best known as the creator of sailor moon, and her forte is in writing girls romance manga. Use of mononobeokabe equations in seismic design of. 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 dynamic active earth pressure on retaining structures due to seismic loading is commonly obtained by using the modified coulombs approach which is known as the mononobeokabe method. 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. Chapter 14 a procedure for seismic design of retaining walls. These kinds of theories propose a coefficient which is a ratio between horizontal and vertical stress behind retaining walls. Extension of mononobeokabe approach to unstable slopes by sara ebrahimi approved. Using appropriate assumptions the method can also be employed for static slope stability analysis. 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.
Mononobe okabe theory continuum mechanics force scribd. Scribd is the worlds largest social reading and publishing site. The classical equations of coulomb 14,10 and this expectation does not seem to diminish by the advent mononobe okabe 511. In addition to coulomb and rankines earth pressure theory, other theoretical. Use of mononobeokabe equations in seismic design of retaining walls in shallow soils proc. Soilstructure interaction of retaining walls under. Research article extended mononobeokabe method for. The ones marked may be different from the article in the profile. The coulombs theory is further extended to evaluate seismic active earth pressure considering c. Mononobeokabe mo method is still employed as the first option to estimate lateral earth pressures during earthquakes by geotechnical engineers. Mri of cervical intervertebral discs in asymptomatic subjects. Extended mononobeokabe method for seismic design of.
Various publications differ on the magnitude of outward wall deformations. Phonetic evidence for the development of the acute tone. Mononobe okabe method mo, a seismic version of coulomb theory, was proposed based on pseudostatic earthquake loading for granular soils. The eurocodes consider the possibility of each european country to adopt their own seismic parameters as the seismic risk is. 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. This method applies earthquake force components using two coefficients called seismic horizontal and vertical coefficients. A shikaisen from ancient japanmononobe no futo is a shikaisen, formerly a hermit practicing taoism. Comparison of pseudostatic and pseudodynamic methods. Therefore, the results are true in its assumption range only, and in many.
The retaining walls guidance is supplementary to the guidance document repairing and rebuilding houses affected by the canterbury earthquakes. Manga is the japanese word for comic, but in english it means japanese comics. Professional duties and the uncooperative hivinfected client mindie r. The estimation of seismic active earth pressure on retaining walls from backfill soils is an important problem in earthquake engineering. Pdf extended mononobeokabe method for seismic design.
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. The mononobeokabe mo method is a pseudostatic approach, which. Pdf an alternative to the mononobeokabe equation for seismic. The set of common facilities contains names, procedures, applications, exception mechanisms, mutable data structures, and possibly other forms of nonlocal. Seismic design of earth retaining structures by atop lego, m.
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