نوع مقاله : پژوهشی
نویسندگان
1 دانشکده ی مهندسی عمران، دانشگاه تربیت دبیر شهید رجائی
2 دانشکده ی مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
Design of retaining wall needs to be considering for static and dynamic stability. For seismic design prediction of displacement and rotation of wall under earthquake loading is necessary that should be less than of allowable values according to performance based seismic design. During an earthquake the
lateral earth increases and the walls become susceptible to failure which has
resulted in frequent damages of the walls. Gravity retaining walls are designed
to restrain against the lateral earth thrust while keeping its original position intact. Analysis of the seismic behavior of gravity retaining walls during earthquake loading is quite complex and seismic movements can occur as
sliding or rotational. In this research factors affecting on seismic displacements and rotations of gravity retaining wall using physical model have been investigated. The scale of physical model is thirtieth using laboratory manufacture. Dimension of wall (height and base), acceleration, time and
frequency of seismic loading and friction of base wall are factors that have
been studied in this research. The results have shown that permanent
deformation of wall under seismic loading increase with height of wall and
decrease with base increment. Acceleration of loading can increase seismic
displacement of wall with an exponential function. Skin fiction of base wall
can reduce movement of retaining wall and rotation effect. Acceleration and
frequency of cyclic movement in this research have been investigated that the
result shown that these parameters have the dominant effects on the permanent
displacement of retaining wall and backfill. Seismic movements and rotation of
retaining wall have direct correlation with acceleration and frequency of cyclic movement .There are many methods based on pseudo-static and pseudo-dynamic force that can estimate seismic displacements of retaining wall.In this study using the Newmark sliding block procedure, try to propose suitable accelerating to predict permanent movement of retaining wall and backfill during earthquake loading.
کلیدواژهها [English]
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