استخراج پارامترهای مدل چرخه‌ای دیوارهای برشی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه عمران، دانشگاه قم، قم، ایران

2 گروه مهندسی عمران، دانشکده فنی و مهندسی، دانشگاه قم، قم، ایران

چکیده

در طراحی لرزه‌ای سازه‌ها بر اساس عملکرد، درک صحیح و کامل رفتار غیرخطی اعضای سازه‌ای در تغییرشکل‌های غیرارتجاعی ناشی از زلزله مورد نیاز است. عمدتاً در زلزله اعضای سازه‌ای لرزه ‌بر وارد فاز غیرارتجاعی شده و در آن‌ها مفاصل پلاستیک تشکیل می‌شود. جهت برآورد عددی رفتار سازه‌ها، لازم است منحنی بار-تغییرشکل رفتار چرخه‌ای عضو سازه‌ای در دسترس باشد تا بر مبنای آن بتوان پاسخ لرزه‌ای سازه‌ها را تخمین زد. مدل‌های چرخه‌ای عمدتاً توسط پارامترهایی تعریف می‌شوند که بیانگر مقاومت، سختی، شکل‌پذیری، زوال و سایر خصوصیات اجزاء سازه‌ای می‌باشند. پارامترهای رفتار چرخه‌ای را می‌توان از روش‌های مختلفی استخراج نمود که شامل استخراج نتایج از آزمایش، مدل‌های اجزای محدود و روابط محاسباتی مبتنی ‌بر مکانیک می‌باشد. هدف این تحقیق استخراج پارامترهای مدل‌سازی دیوارهای برشی بتنی بر اساس نتایج آزمایشگاهی است. در این مطالعه پارامترهای رفتار چرخه‌ای دیوارهای برشی برای 135 نمونه آزمایشگاهی دیوار برشی بلند و 99 نمونه آزمایشگاهی دیوار برشی کوتاه که تحت آزمایش بارگذاری چرخه‌ای قرار گرفته‌اند، محاسبه شده است. به همین منظور با استفاده از مدل رفتار چرخه‌ای اصلاح شده ایبارا-کراوینکلر در نرم‌افزار OpenSees، نتایج آزمایشگاهی مدل‌سازی و پارامترهای چرخه‌ای آن استخراج شده‌اند. در انتها، پارامترهای چرخه‌ای استخراج شده بصورت آماری جمع‌بندی شده و محدوده‌های پیشنهادی برای هر یک از پارامترهای رفتار چرخه‌ای دیوارهای برشی ارائه گردیده است.  

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Determining Hysteretic Parameter Model for RC Shear Wall

نویسندگان [English]

  • Mahdi Sharifi 1
  • Mohammad Ali Fathali 2
  • Mohammad Ali Ansaripour 2
  • Ahmadreza Mohamad Amri 2
1 Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran
2 Department of Civil Engineering, Faculty of Engineering, University of Qom, Qom, Iran
چکیده [English]

In seismic performance-based design, this is required to have comprehensive knowledge about the nonlinear behavior of components. In time history analysis which is the most power full tool for predicting the structural response, the hysteretic model of the plastic hinge is needed. Hysteretic models are defined with some parameters that show strength, stiffness, ductility, deterioration, degradations, and other characteristics such as reversal path. Hysteretic parameters can be adopted from different methods including experimental results, finite element analysis, and mechanical engineering relation. The main goal of this research is to determine and extracting the shear wall hysteretic parameter from the existing experimental test results. The hysteretic parameters have been extracted from 135 sample test data for the slender shear wall and 99 sample test data for the squat shear wall in this study. All experimental test data has been simulated in OpenSees software using the modified Ibarra-krawinkler models and their hysteretic parameters are extracted. Finally, some statistical analysis has been performed and the representative values of these statics are presented.  

کلیدواژه‌ها [English]

  • Nonlinear Analysis
  • RC shear wall
  • cyclic behavior
  • Stiffness Degradation
  • strength deterioration
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