جستجوی مقالات مرتبط با کلیدواژه « retaining walls » در نشریات گروه « عمران »

The purpose of this study is to investigate the seismic design methods of the retaining walls. Seismic behavior of the retaining walls for dynamic loads, seismic design and stability of these structures during the earthquake were studied by studying retaining wall design methods. The overall lateral pressures during earthquake vibrations are the static pressures that occur before the earthquake and the dynamic pressures generated by the earthquake, and the wall response is affected by both pressures. The results of this study show that if there is a possibility of sliding, rotating, or deforming to a sufficient degree to be able to mobilize the active soil pressure, the dynamic wall pressures will be applied via static or semi-static Mononobe -Okabe methods. In case of impermeability of the retaining walls (fixed walls), elastic analysis is also performed, and the most common dynamic analysis methods include the Mononobe -Okabe semi-static method, the Steedman - Zeng method, the Wood method and the Westergaard method, which can be developed.

Current design of Geo synthetic-reinforced soil (GRS) walls, shows that the horizontal deformations in the walls increases rapidly with height. To take advantage of both the aesthetics and the economics of GRS walls while considering high heights, multi-tiered walls are often used. In this context, 12 models of the walls were constructed and their performance was determined under static loading. This study presents a series of model tests on the GRS walls in a tiered configuration, to evaluate the effects of factors, including the offset distance between adjacent tiers and number of tiers, on the lateral displacements of the wall facing and ultimate bearing capacities of the strip footings on the multi-tiered GRS walls. The ultimate bearing capacity and wall deflection can be significantly improved by increasing the number of tiers wall and increase of tier-offset. Interaction between the upper and lower walls significantly influences the tier-offset, and the interaction between the walls, significantly increase in the horizontal deformation in the wall face for the upper wall. With an increase in the offset distance, the lateral displacement decreased significantly, particularly in the upper tier. The experimental results showed that, the Performance in Four layers of reinforcement, and two tier walls, the optimum offset distance obtained for D/H= 0.35. When the offset becomes significantly large, each tier functions independently