دانلود رایگان مقاله انگلیسی تحلیل احتمالی ظرفیت پایانی باربری لرزه ای پی های نواری - الزویر 2018

عنوان فارسی
تحلیل احتمالی ظرفیت پایانی باربری لرزه ای پی های نواری
عنوان انگلیسی
Probabilistic analysis of ultimate seismic bearing capacity of strip foundations
صفحات مقاله فارسی
0
صفحات مقاله انگلیسی
8
سال انتشار
2018
نشریه
الزویر - Elsevier
فرمت مقاله انگلیسی
PDF
نوع مقاله
ISI
نوع نگارش
مقالات پژوهشی (تحقیقاتی)
رفرنس
دارد
پایگاه
اسکوپوس
کد محصول
E9404
رشته های مرتبط با این مقاله
مهندسی عمران
گرایش های مرتبط با این مقاله
ژئوتکنیک، زلزله
مجله
مجله مکانیک سنگ و مهندسی ژئوتکنیک - Journal of Rock Mechanics and Geotechnical Engineering
دانشگاه
Laboratory InfraRes - Mohammed Cherif Messaadia University - Souk-Ahras - Algeria
کلمات کلیدی
پی های نواری، ظرفیت باربری لرزه ای، روش اطمینان اولین سفارش (FORM) روش سطح پاسخ (RSM) قابلیت اطمینان، الگوریتم ژنتیک (GA)
doi یا شناسه دیجیتال
https://doi.org/10.1016/j.jrmge.2018.01.009
چکیده

abstract


This paper presents a reliability analysis of the pseudo-static seismic bearing capacity of a strip foundation using the limit equilibrium theory. The first-order reliability method (FORM) is employed to calculate the reliability index. The response surface methodology (RSM) is used to assess the Hasofer eLind reliability index and then it is optimized using a genetic algorithm (GA). The random variables used are the soil shear strength parameters and the seismic coefficients (kh and kv). Two assumptions (normal and non-normal distribution) are used for the random variables. The assumption of uncorrelated variables was found to be conservative in comparison to that of negatively correlated soil shear strength parameters. The assumption of non-normal distribution for the random variables can induce a negative effect on the reliability index of the practical range of the seismic bearing capacity.

نتیجه گیری

6. Conclusions


An analysis based on the reliability of seismic bearing capacity of strip foundation subjected to a vertical load with pseudo-static seismic loading is presented in this paper. The main conclusions are drawn as follows:


(1) The use of GA is very effective in optimizing the unknown parameters of the performance limit function. A quadratic polynomial function with crossed terms between the parameters makes it possible to obtain a satisfactory approximation of the limit performance state in the previous analyses.


(2) Assumption of negatively correlated shear strength parameters (c, 4) was found conservative with respect to uncorrelated variables. For uncorrelated shear strength parameters values, the design point value c* slightly exceeds the average value of c, which gives partial safety coefficients Fc less than 1 and large values of F4 and Fkh . For this reason, a case with Fc less than 1 does not necessarily indicate failure, as long as the value of F4 is high.


(3) For the higher values of the minimum seismic bearing capacity, the reliability index bHL is low and induces a very high failure probability value, indicating the vulnerability of this structure.


(4) The simplified assumption considering a normal variable is safer compared to more complex probabilistic models (nonnormal variables). This can lead to uneconomical designs.


بدون دیدگاه