پديد آورندگان :
وكيلي، امير دانشگاه آزاد اسلامي واحد بيضا - گروه مهندسي عمران، بيضا , زمرديان، محمدعلي دانشگاه شيراز، شيراز , احمدي، محمدحسين دانشگاه آزاد اسلامي واحد بيضا - گروه مهندسي عمران، بيضا
كليدواژه :
گروه شمع , بار بري جانبي , روش P-Y , ضريب كاهش گروه
چكيده فارسي :
سازه ها اغلب تحت بارهاي جانبي ناشي از وزش باد، زلزله ها، امواج آب قرار ميگيرند. به منظور ايجاد يك طراحي ايمن و اقتصادي پيش بيني و اندازه گيري رفتار «بار- جابجايي» گروه شمع بسيار مورد نياز مي باشد. رفتار شمع هاي مدفون در خاك زماني كه تحت بار جانبي قرار گرفته اند به طور معمول توسط روش فنرهاي غيرخطي وينكلر مدل سازي و تحليل مي شود در اين روش اندركنش خاك-شمع توسط منحني‌هاي غيرخطي p-y مدل سازي مي گردد به طوري كه منحني p-y تك شمع ها را با استفاده از يك ضرب Pm براي هر رديف شمع واقع در گروه ويرايش و اصلاح مي كنند كه اين مقدار متوسط ضريب Pm «ضريب كاهش گروه» ناميده ميشود. تحقيق حاضر با مطالعه بر روي اثرات و فاكتورهاي مختلف از جمله فاصله شمع ها در گروه و تأثير چيدمان هاي مختلف بر روي مقدار ضريب كاهش گروه صورت گرفته است. ضريب كاهش گروه بدست آمده از اين مطالعه به خوبي با نتايج آزمايش هاي بزرگ مقياس صورت گرفته بر روي گروه شمع ها مورد مقايسه قرار گرفته اند به طوري كه نتايج تطابق خوبي با نتايج آزمايش هاي بزرگ مقياس از خود نشان مي دهند. نتايج نشان مي دهد مقدار ضريب pm براي گروه هاي شمع با چيدمان هاي مختلف با فاصله 2/5 برابر قطر در محدوده 0/42 تا 0/54 قرار گرفته است كه اين نتايج به مقدار ضريب pm بدست آمده از تحقيقات گذشته مشابهت بسيار زيادي دارد.
چكيده لاتين :
Structures are often subjected to lateral loads due to earthquakes, winds, and waves of water. It is very necessary to predict and measure the "load-deflection" behavior of the pile group, as well as its strain behavior, in order to create a safe and economical design. The behavior of piles embedded in soil, placed under the lateral load, is typically modeled and analyzed using the Winkler nonlinear springs method. In this method, the soil-pile interaction is modeled by nonlinear curves of P-Y in a way that P-Y curve modifies and adjust the single pile using a p-multiplier ( ) for each row of piles in the group. The factor depends upon the configuration of pile group and the pile spacing. The value of this factor for the leading rows are considered higher and for the trailing rows lower. The present study was conducted to investigate the effects of various parameters, such as the pile spacing in the group and different layouts on the factor. The factor obtained from this study has good compatibility with the results of the full-scale test on pile group. The results show that the value of the factor for pile groups with different layouts of 2.5-diameter pile spacing was in the range of 0.42 to 0.54, which is very close to the value of obtained by previous study.Structures are often subjected to lateral loads due to earthquakes, winds, and waves of water. It is very necessary to predict and measure the "load-deflection" behavior of the pile group, as well as its strain behavior, in order to create a safe and economical design. The behavior of piles embedded in soil, placed under the lateral load, is typically modeled and analyzed using the Winkler nonlinear springs method. In this method, the soil-pile interaction is modeled by nonlinear curves of P-Y in a way that P-Y curve modifies and adjust the single pile using a p-multiplier ( ) for each row of piles in the group. The factor depends upon the configuration of pile group and the pile spacing. The value of this factor for the leading rows are considered higher and for the trailing rows lower. The present study was conducted to investigate the effects of various parameters, such as the pile spacing in the group and different layouts on the factor. The factor obtained from this study has good compatibility with the results of the full-scale test on pile group. The results show that the value of the factor for pile groups with different layouts of 2.5-diameter pile spacing was in the range of 0.42 to 0.54, which is very close to the value of obtained by previous study.
