5 nhungdonggopmoilatienganh ncsngoquoctrinh

SUMARY OF THESIS CONTRIBUTION Topic of Study: “A study on pile working under horizontal load and seismic load” Field of Study: Civil and Industrial Construction Engineering Code: 62 58 02 08 Name of PhD Student: Ngo Quoc Trinh Supervisors : Ass Prof Dr Vuong Van Thanh Dr Tran Huu Ha Training Institution: Hanoi Architecture University Sumary of Thesis Contribution Through numerical solution using the finite element method, Kelvin solution about Mindlin solution can be provided, that means getting the solution of elastic infinite semispace from the solution of elastic infinite space with load placed in any position Formulating the static interactive problem, dynamic interaction between piles with soil under static load, horizontal dynamic load at any position Using the finite element method with soil tobe 3-D element, 20 buttons; pile with button elements for displacement and buttons for shear force to solve This method automatically satisfies the boundary conditions at infinity, the soil boundary conditions as well as conditions between pile and soil, i.e no need to add extra links as springs, viscous box on the contact surface between the pile - ground, on the border of the land mass storing piles In addition, the study also investigates the parameters affecting the work of the piles such as pile length, stiffness of the pile, piles placed on a layer of hard rock and the effect of piles to the work of the soil In the calculation of the construction dynamics and earthquake, the viscosity coefficient is offen considered In this thesis, the author does not use the ordinary viscosity coefficient but use the hysteretic damping or dry friction coefficient This coefficient allows the consideration of the phenomenon of plastic deformation of the ground when needed Formulating Love wave problem transmitted from the ground up to soil layer by considering love waves in the horizontal plane and in vertical plane Based on the numerical solution of the finite element method, phenomenon of fluctuating surface amplification vertically to the wave propagation is studied, consistently with the theory of Love wave propagation Formulating the interactive dynamic problem of the pile under the seismic load Using the convolution integral Duhamel provides solution in the frequency domain, then Fourier transform, reverse (IFFT) provides results in the time domain Use the acceleration map of a real earthquake (El Centro 1940) as input parameters to survey, identify displacement parameters, torque, shear force of the pile at any time Based on Matlab programming language to develop the calculating software program to serve the case studies and surveys: Mstatic1; Kstatic1; MstaticP1; KstaticP1; KstaticPLs; KdynaS; KdynaL; KdynaP; KdynaPE Hanoi, 5th January 2014 PhD Student MSc Ngo Quoc Trinh