نوع مقاله : یادداشت فنی
نویسندگان
1 دانشکده مهندسی عمران، دانشگاه یزد
2 دانشکده مهندسی عمران، دانشگاه شهید باهنرکرمان
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Fundamentally, the stability of masonry structures is dependent on the soil-basement wall interaction. Due to the ease of calculation and design of retaining walls by the quasi-static method of Mononobe-Okabe (M-O), this method has been widely used. However, the results of numerical models and experimental data have shown that this method is not very accurate, and the design is either very conservative or is unsafe. Since, in Iran, the use of masonry structures without reinforcement is predominant, in this study, the dynamic interaction between soil and masonry walls has been evaluated. This study has been conducted utilizing a 2D Plane Strain Finite Element Model. The behavior of the wall before cracking is idealized as elastic plate. After cracking, the strength of the wall drops very quickly, and, in this case, the remaining strength can be ignored, which can be assumed as having collapsed. Considering the geotechnical aspects that normally occur in practice, they have been simulated to produce the state of rest ($k_{o}$) in backfill soil for a static situation. This state of stress has been selected for the initial condition in dynamic analysis. Dynamic displacement excitation is applied in a sinusoidal form at bed rock level by three cycles with different frequencies, but with the same peak acceleration in each case equal to 0.3g. The effect of excitation frequency, soil type, height, and the ratio of height to thickness in the wall was evaluated using the maximum bending moment of the wall ($M_{max}$) as a criterion for the wall performance. The numerical results show that the effect of the shear wave velocity of the soil and excitation frequency on the dynamic response of the basement wall cannot be ignored. However, these factors are overlooked in the M-O method. This study has also demonstrated that the dynamic interaction of the soil and basement walls is necessary to consider parameters, such as: dynamic excitation frequency, soil type, and geometry of the wall.
کلیدواژهها [English]
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