پديد آورنده :
صالحي، احمد
عنوان :
تحليل لرزه اي غير خطي پل هاي پس كشيده جعبه اي با در نظر گرفتن اندركنش خاك و سازه
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده عمران
صفحه شمار :
يازده، 178، [II]ص.: مصور، جدول، شكل، نمودار
استاد راهنما :
امير مهدي خليليا ن
استاد مشاور :
عبدالغني رزاق پور
توصيفگر ها :
اصل بر هم نهي , ميرايي هندسي ، هيسترزيس خاك , پي هاي سطحي و شمعي , روش هاي محاسبه سختي ديناميك خاك صادق وزيري ،سيدهارتان , كلاهك شمع , مدل ولف، ولتسوس , زلزله كوبه ژاپن , الاستومري , ضرايب سختي و ميرايي , ميلگردهاي فولادي
استاد داور :
فياض رحيم پور، فرهاد بهنام فر
تاريخ ورود اطلاعات :
1395/12/14
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
fAbstractMajor damages of modem bridges which were designed according to the current codes indicate new aspectsof the problem such as soil structure interaction necessity of taking intoaccount in design and retrofitting of sucha bridges This study aimed to develop a new approach for calculating dynamic stiffnesses of bridgesabutments and to evaluate inelastic seismic response of R C box girder bridges consideringsoil structure interaction SSI Ductility factor of piers was also evaluated accounting forfoundation flexibility In the first part having existing methods for determining dynamic stiffnesses of abutmentsreviewed a new approach for computing dynamic stiffness of seat type abutments wasdeveloped The method is benefited for advantagesof 1 All contributed components ofabutment system is considered 2 Stiffness and damping coefficients are frequencydependent 3 Taking into account damping coefficient separately and 4 Rational modelingof backfill behavior through seismic excitation is also considered Parametric study of a seat type abutment showed stiffness and damping constants are strongly frequency dependentandthey vary with soil conditions In the second part implementing 3 D nonlinear dynamic time history analyses of a practicalmodel of box girder Bridge effects of soil characteristics on seismic response of the bridgewere evaluated Soil shear wave velocity shear modulus of backfill abutment and piersfoundation type gap size between deck and abutments were taken into account to performcomprehensiveparametric study for examining SSI effects on seismic behavior of the bridge Results showed that SSI has significant effect on global seismic response of bridges especially in longitudinal direction It was found that for box girder bridges torsional modeswhich are important in the deck design may be affected by soil conditions Obtained deckdisplacementsand pounding forces indicated the abutment strength and backfill soil propertyare important factors on corresponding amplitudes In addition gap size can have an importantinfluence on pounding forces too However for a soft soil pile foundation has more beneficialeffects on dropping seismic response of bridges rather than shallow foundation and reducessensitivity of the response particularly deck and piers displacementdemands Third part of this study considered the SSI effects on piers ductility factor for bridgessupporting on seat type abutments Using stress strain relations for concrete and steelreinforcement in plastic hinged an incremental time history analysis procedure wasperformed The results showed that taking SSI into account could increase displacementductility demand of piers keeping in mind that the earthquake records can playa significantrole on its variations ffj j J lif l l I J I r l
استاد راهنما :
امير مهدي خليليا ن
استاد مشاور :
عبدالغني رزاق پور
استاد داور :
فياض رحيم پور، فرهاد بهنام فر
