دانشگاه صنعتی امیرکبیر نشریه مهندسی عمران امیرکبیر 2588-297X 50 4 2018 10 23 Performance Evaluation of Anchored Diaphragm Walls under Service Loads ارزیابی عملکرد دیوار دیافراگمی مرکب با مهارهای پیش‌تنیده تحت بارگذاری بهره‌برداری (استاتیکی) 765 780 1011 10.22060/ceej.2017.12799.5271 FA محسن مینائی جاوید دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران علیرضا رهایی دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران 0000-0002-9101-0794 ابوالفضل اسلامی دانشکده مهندسی عمران و محیط زیست، دانشگاه صنعتی امیرکبیر، تهران، ایران Journal Article 2017 04 22 <span>Nowadays, RC or combined diaphragm walls are vastly used for deep excavation. This type of retaining structures consists of some piles, which are tied-back using the anchors and anchored from their toe to the ground. Concrete or wood plates were used between them. In order to evaluate the effects of some parameters on wall deflection and its internal forces, several models of combined diaphragm walls were selected and analyzed using FLAC software. Before developing the models, Lim and Braiud (1999) case study was modeled with FLAC2D and results were compared with the experimental results indicating acceptable accuracy of the modeling. The numerical model simulated the soldier piles with beam elements and the anchors with cable elements. The soil model used is a modified hyperbolic model with unloading hysteresis. The complete sequence of construction was simulated including the excavation and the placement and stressing of the anchors. The numerical model was calibrated against an instrumented case history. Then a parametric study was conducted. The parameters which was evaluated were: distance and stiffness variation, the bonded and un-bonded length of the anchors, the angle of the anchors and the first raw anchor location. By comparing the different parameters it was observed that the variation of the flexural stiffness of the soldier piles and variation of the bond length of the anchors contained the highest and lowest effect on the maximum horizontal displacement of the wall, respectively. Other analytical results consisting wall deflection vs. geometric characters of the wall were presented and discussed.</span> <span lang="AR-SA" dir="RTL">سیستم</span><span lang="AR-SA"> <span dir="RTL">دیوار</span> <span dir="RTL">دیافراگمی</span> <span dir="RTL">مرکب،</span> <span dir="RTL">جهت</span> <span dir="RTL">بهینه‌تر</span> <span dir="RTL">شدن</span> <span dir="RTL">عملکرد</span> <span dir="RTL">دیوار</span> <span dir="RTL">دیافراگمی</span> <span dir="RTL">بتنی</span> <span dir="RTL">ابداع</span> <span dir="RTL">شده</span> <span dir="RTL">است</span></span><span>. <span lang="AR-SA" dir="RTL">در</span><span lang="AR-SA"> <span dir="RTL">این</span> <span dir="RTL">سیستم</span> <span dir="RTL">از ترکیب</span> <span dir="RTL">شمع</span> <span dir="RTL">نگهبان</span> <span dir="RTL">فولادی</span> <span dir="RTL">در</span> <span dir="RTL">داخل</span> <span dir="RTL">دیواره</span> <span dir="RTL">بتنی</span> <span dir="RTL">استفاده</span> <span dir="RTL">می‌شود</span></span>. <span lang="AR-SA" dir="RTL">یکی</span><span lang="AR-SA"> <span dir="RTL">از</span> <span dir="RTL">ملزومات</span> <span dir="RTL">طراحی</span> <span dir="RTL">مناسب،</span> <span dir="RTL">داشتن</span> <span dir="RTL">دانش</span> <span dir="RTL">و</span> <span dir="RTL">اطلاعات کافی</span> <span dir="RTL">در</span> <span dir="RTL">زمینه</span> <span dir="RTL">رفتار</span> <span dir="RTL">سازه</span> <span dir="RTL">مورد</span> <span dir="RTL">نظر</span> <span dir="RTL">است</span></span>. <span lang="AR-SA" dir="RTL">به</span><span lang="AR-SA"> <span dir="RTL">همین</span> <span dir="RTL">علت</span> <span dir="RTL">این</span> <span dir="RTL">نیاز</span> <span dir="RTL">احساس</span> <span dir="RTL">شد</span> <span dir="RTL">تا</span> <span dir="RTL">با</span> <span dir="RTL">مطالعه</span> <span dir="RTL">پارامتریک،</span> <span dir="RTL">رفتار</span> <span dir="RTL">دیوار</span> <span dir="RTL">دیافراگمی مرکب،</span> <span dir="RTL">مورد</span> <span dir="RTL">بررسی</span> <span dir="RTL">قرار</span> <span dir="RTL">گیرد</span></span>. <span lang="AR-SA" dir="RTL">در</span><span lang="AR-SA"> <span dir="RTL">این</span> <span dir="RTL">پژوهش،</span> <span dir="RTL">با</span> <span dir="RTL">ساخت</span> <span dir="RTL">مدل</span> <span dir="RTL">عددی</span> <span dir="RTL">با</span> <span dir="RTL">استفاده</span> <span dir="RTL">از</span> <span dir="RTL">نرمافزار</span> </span></span><span>FLAC</span><span>2D </span><span lang="AR-SA" dir="RTL">،</span><span lang="AR-SA"> <span dir="RTL">به</span> <span dir="RTL">بررسی</span> <span dir="RTL">عوامل</span> <span dir="RTL">موثر</span> <span dir="RTL">بر رفتار</span> <span dir="RTL">دیوار</span> <span dir="RTL">دیافراگمی</span> <span dir="RTL">مرکب</span> <span dir="RTL">مهار</span> <span dir="RTL">شده</span> <span dir="RTL">در</span> <span dir="RTL">حالت</span> <span dir="RTL">بهره برداری</span> <span dir="RTL">پرداخته</span> <span dir="RTL">شده</span> <span dir="RTL">است</span></span><span>. <span lang="AR-SA" dir="RTL">از</span><span lang="AR-SA"> <span dir="RTL">مدل</span> <span dir="RTL">رفتاری</span> <span dir="RTL">دانکن</span></span>-<span lang="AR-SA" dir="RTL">چنگ</span><span lang="AR-SA"> <span dir="RTL">اصلاح</span> <span dir="RTL">شده</span> <span dir="RTL">برای مدلسازی</span> <span dir="RTL">رفتار</span> <span dir="RTL">بارگذاری</span></span>-<span lang="AR-SA" dir="RTL">باربرداری</span><span lang="AR-SA"> <span dir="RTL">خاک،</span> <span dir="RTL">از</span> <span dir="RTL">المان</span> <span dir="RTL">کابل</span> <span dir="RTL">برای</span> <span dir="RTL">مدلسازی</span> <span dir="RTL">مهار</span> <span dir="RTL">پیش تنیده</span> <span dir="RTL">و</span> <span dir="RTL">المان</span> <span dir="RTL">تیر</span> <span dir="RTL">برای</span> <span dir="RTL">مدلسازی</span> <span dir="RTL">پروفیل‌های فولادی</span> <span dir="RTL">استفاده</span> <span dir="RTL">گردید</span></span>. <span lang="AR-SA" dir="RTL">صحّت سنجی</span><span lang="AR-SA"> <span dir="RTL">مدل</span> <span dir="RTL">عددی</span> <span dir="RTL">با</span> <span dir="RTL">استفاده</span> <span dir="RTL">از</span> <span dir="RTL">اطلاعات</span> <span dir="RTL">دیوار</span> <span dir="RTL">حائل</span> <span dir="RTL">ساخته</span> <span dir="RTL">شده</span> <span dir="RTL">توسط</span> <span dir="RTL">لیم</span> </span></span><span>1 </span><span lang="AR-SA" dir="RTL">و</span><span lang="AR-SA"> <span dir="RTL">بریود</span> </span><span>2 </span><span lang="AR-SA" dir="RTL">در</span><span lang="AR-SA"> <span dir="RTL">سال 1999</span> <span dir="RTL">انجام</span> <span dir="RTL">شد</span></span><span>. <span lang="AR-SA" dir="RTL">نتایج</span><span lang="AR-SA"> <span dir="RTL">تحلیل</span> <span dir="RTL">مدل‌ها،</span> <span dir="RTL">به</span> <span dir="RTL">صورت</span> <span dir="RTL">بررسی</span> <span dir="RTL">تغییرات</span> <span dir="RTL">جابجایی</span> <span dir="RTL">دیوار</span> <span dir="RTL">متناسب</span> <span dir="RTL">با</span> <span dir="RTL">تغییرات</span> <span dir="RTL">مشخصات</span> <span dir="RTL">هندسی</span> <span dir="RTL">سازه نگهبان</span></span> )<span lang="AR-SA" dir="RTL">دیوار</span><span lang="AR-SA"> <span dir="RTL">دیافراگمی</span> <span dir="RTL">مرکب</span></span>( <span dir="RTL"> <span lang="AR-SA">استخراج</span></span><span lang="AR-SA"> <span dir="RTL">شده</span> <span dir="RTL">است</span></span>. <span lang="AR-SA" dir="RTL">پارامترهای</span><span lang="AR-SA"> <span dir="RTL">مورد</span> <span dir="RTL">بررسی</span> <span dir="RTL">شامل</span> <span dir="RTL">سختی</span> <span dir="RTL">شمع</span> <span dir="RTL">نگهبان</span> <span dir="RTL">فولادی،</span> <span dir="RTL">طول</span> <span dir="RTL">آزاد</span> <span dir="RTL">و گیردار</span> <span dir="RTL">مهار</span> <span dir="RTL">پیش تنیده،</span> <span dir="RTL">زاویه</span> <span dir="RTL">مهار</span> <span dir="RTL">پیش تنیده</span> <span dir="RTL">با</span> <span dir="RTL">افق،</span> <span dir="RTL">فاصله</span> <span dir="RTL">افقی</span> <span dir="RTL">شمع</span> <span dir="RTL">نگهبان</span> <span dir="RTL">فولادی</span> <span dir="RTL">و</span> <span dir="RTL">فاصله</span> <span dir="RTL">ردیف</span> <span dir="RTL">اول</span> <span dir="RTL">مهار</span> <span dir="RTL">از</span> <span dir="RTL">تاج</span> <span dir="RTL">گود</span> <span dir="RTL">است</span></span>.<span dir="RTL"> <span lang="AR-SA">با</span></span><span lang="AR-SA"> <span dir="RTL">مقایسه</span> <span dir="RTL">پارامترهای</span> <span dir="RTL">مختلف</span> <span dir="RTL">مشاهده</span> <span dir="RTL">شد</span> <span dir="RTL">که</span> <span dir="RTL">در</span> <span dir="RTL">حالت</span> <span dir="RTL">بهره برداری</span> <span dir="RTL">تغییرات</span> <span dir="RTL">سختی</span> <span dir="RTL">خمشی</span> <span dir="RTL">شمع</span> <span dir="RTL">نگهبان</span> <span dir="RTL">و</span> <span dir="RTL">تغییرات</span> <span dir="RTL">طول</span> <span dir="RTL">ناحیه گیردار</span> <span dir="RTL">مهار</span> <span dir="RTL">به</span> <span dir="RTL">ترتیب</span> <span dir="RTL">بیشترین</span> <span dir="RTL">و</span> <span dir="RTL">کمترین</span> <span dir="RTL">اثر</span> <span dir="RTL">را</span> <span dir="RTL">بر</span> <span dir="RTL">روی</span> <span dir="RTL">ماکزیمم</span> <span dir="RTL">جابجایی</span> <span dir="RTL">افقی</span> <span dir="RTL">دیوار</span> <span dir="RTL">دارد</span></span>. <span lang="AR-SA" dir="RTL">یافته‌های</span><span lang="AR-SA"> <span dir="RTL">این</span> <span dir="RTL">پژوهش</span> <span dir="RTL">برای</span> <span dir="RTL">طراحی و</span> <span dir="RTL">درک</span> <span dir="RTL">بهتر</span> <span dir="RTL">رفتار</span> <span dir="RTL">تغییرشکلی</span> <span dir="RTL">دیوار</span> <span dir="RTL">دیافراگمی</span> <span dir="RTL">مرکب</span> <span dir="RTL">با</span> <span dir="RTL">مهار</span> <span dir="RTL">پیش تنیده</span> <span dir="RTL">مفید</span> <span dir="RTL">است</span></span>.</span> https://ceej.aut.ac.ir/article_1011_7f975a56c761db6506eca0b37ce6ec87.pdf