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Dr. Seyed Mojtaba Mosavi Nezhad

Department of Civil Engineering, University of Birjand

Civil Engineering

[email protected]

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مقایسه عملکرد لرزه‌ای قاب خمشی بتنی با نامنظمی جرمی دارای جداساز لرزه‌ای هسته سربی (LRB) در برابر با میراگر فلزی جاری شونده (TADAS)

More than 1 year ago

Dr. Seyed Mojtaba Mosavi Nezhad , Department of Civil Engineering, University of Birjand ,
Amin Reza Bazobandi , Islamic Azad university ferdows ,

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Paper Abstract

رویکرد مهندسی زلزله در سال‌های اخیر بهینه کردن خواص دینامیکی سازه در جهت کاهش نیروی وارده به سازه و هدایت تغییر شکل‌های غیر ارتجاعی به محل‌های از پیش تعیین شده می‌باشد. از این رو روش‌هایی جهت افزایش پریود طبیعی سازه مانند دستگاه‌های جداساز لرزه‌ای و روش‌های جهت افزایش نسبت میرایی مانند میراگرهای جاری شونده ابداع شد. در این مقاله 3 سازه بلند مرتبه دارای نامنظمی جرمی در سه حالت مختلف (سازه دارای جداساز لرزه‌ای، سازه دارای میراگر جاری شونده و سازه بدون میراگر و جداساز لرزه‌ای) با هفت شتاب نگاشت مختلف برای سه مولفه شتاب زلزله مورد تحلیل دینامیکی غیر خطی قرار گرفتند. ملاک نتیجه‌گیری و مقایسه، مقادیر میانگین نتایج سازه‌های مورد بررسی است. از بررسی نمودارهای میانگین مقادیر برش پایه حداکثر سازه‌ها مشاهده می‌شود که میانگین حداکثر برش ‌پایه تکیه‌گاهی سازه دارای میراگر جاری شونده و یا سازه دارای جداساز لرزه‌ای عملکرد یکسانی در جهت کاهش برش پایه سازه دارند. در بررسی مجموع نیروی محوری ستون‌های طبقه همکف سازه‌ها مشاهده می‌شود که میراگر جاری شونده و جداساز لرزه‌ای تقریبا عملکرد یکسانی در جهت کاهش نیروی محوری ستون‌های طبقه همکف سازه داشته اند. با توجه به محاسبات و تحليل‌هاي انجام شده و نتايج حاصله مي توان نتيجه گرفت كه استفاده از ميراگرها و جداگرها باعث بهبود عملكرد لرزه‌ای سازه خواهد شد.

تاثیر پوزلان زئولیت و ماسه بازیافتی بر مقاومت کششی و جذب آب بتن

More than 2 years ago

Dr. Seyed Mojtaba Mosavi Nezhad , Department of Civil Engineering, University of Birjand ,
Mr. Amir Atayi Talebi , Pars Razavi Institute of Gonabad ,

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Paper Abstract

تخريب ساختمان‌ها، رويه راه‌ها، جداول و قطعات پيش‌ساخته، پل‌ها و پاک‌سازي آوارهاي ناشي از بلاياي طبيعي و انساني بعث تولید ضایعات ساختمانی مي‌شوند. يكي از ضایعات ساختمانی كه پتانسيل خوبي براي بازيافت دارد، بتن مي‌باشد. بتن ضايعاتي را مي‌توان دوباره خرد نموده و به عنوان سنگ‌دانه در ساخت بتن استفاده کرد. بازيافت بتن ضایعاتی باعث حفظ منابع طبیعی می‌شود. در این مقاله ابتدا طرح اختلاط بتن بازیافتی که از بتن‌های خورد شده به عنوان ماسه بازیافتی در آن استفاده شده است نوشته می‌شود. همچنین در طرح اختلاط، سیمان مصرفی در بتن با درصدهای مختلف پوزلان زئولیت جایگزین می‌شود. سپس بر روی بتن‌های ساخته شده با درصدهای مختلف ماسه بازیافتی و پوزلان زئولیت آزمایش مقاومت کششی و جذب آب بتن انجام می‌پذیرد. از آزمایش‌ها نتیجه می‌شود، بيشترين مقاومت كششي مربوط به نمونه دارای 75 درصد ماسه بازیافتی می‌باشد. همچنین بیشترین مقاومت کششی 3.99 مگاپاسکال است که مربوط به نمونه دارای زئولیت 5 درصد است. با افزایش زئولیت میزان جذب آب بتن کاهش می‌یابد به گونه‌ای که بیشترین کاهش جذب آب بتن در مقدار 20 درصد زئولیت حاصل شده است. اما در خصوص ماسه‌های بازیافتی مقدار جذب آب بیشتر می‌شود.

عملکرد لرزه‌ای قاب فولادی مهاربندی شده همراه با میراگر جرمی تنطیم شده تحت زلزله نزدیک گسل

More than 2 years ago

Dr. Seyed Mojtaba Mosavi Nezhad , Department of Civil Engineering, University of Birjand ,
Ali Zahmatkesh , department of civil engineering, Islamic Azad University ,
Mohammad Faeghi Nezhad , department of civil engineering, Islamic Azad University ,

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The Influence of Treated and Untreated Crumb Rubber on Concrete Mechanical Properties: A Review

More than 2 years ago

Mr. Hamed Hasani , Birjand university ,
Dr. Seyed Mojtaba Mosavi Nezhad , Birjand university ,
Ms. Atefeh Soleymani , Departement of Civil Engineering, Shahid Bahonar University , kerman ,
Ms. Fatemeh Shahbaziaval , Birjand university ,
Dr. Hashem Jahangir , Birjand university ,

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Paper References

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H. Hasani, H. Jahangir, D. Rezazadeh Eidgahee, and H. R. Nasseri, “Evaluation of Existing Axial Compressive Strength Models of FRP-Confined Circular Concrete Columns,” in 4th International Conference & 5th National Conference on Civil Engineering, Architecture, Art and Urban Design, 2021.
H. Hasani, H. Jahangir, D. Rezazadeh Eidgahee, and H. R. Nasseri, “Behavior Investigation of Rectangular Concrete Columns Confined by Fiber Reinforced Polymer Composites,” in 2nd Conference on Urban Planning, Architecture, Civil Engineering, Environment, 2021.
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S. Ramarad, M. Khalid, C. T. Ratnam, A. L. Chuah, and W. Rashmi, “Waste tire rubber in polymer blends: A review on the evolution, properties and future,” Progress in Materials Science, vol. 72, pp. 100–140, Jul. 2015.
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X. Zhu, C. Miao, J. Liu, and J. Hong, “Influence of Crumb Rubber on Frost Resistance of Concrete and Effect Mechanism,” Procedia Engineering, vol. 27, pp. 206–213, 2012.
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ارزيابي عملکرد سازه قاب فولادي با دیوار پیش ساخته سبک تحت بارگذاري دوره‌اي

More than 4 years ago

Dr. Seyed Mojtaba Mosavi Nezhad , Birjand university ,
Mohammad Akbari Makoei , دانشگاه صنعتی شاهرود ,

Events:

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اثر مقاومت بتن بر رفتار قاب‌های فولادی مرکب پوشیده شده با بتن تحت اثر بارگذاری چرخه‌‌ای با استفاده از نرم افزار اجزای محدود آباكوس

More than 4 years ago

محمدجواد مشرفی , دانشجوی دانشگاه بیرجند ,
Morteza Malekian , دانشجوی دانشگاه بیرجند ,
Dr. Seyed Mojtaba Mosavi Nezhad , Birjand university ,

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تاثیر پوزولان زئولیت بر مقاومت فشاری بتن بازیافتی

More than 5 years ago

Mr. Amir Atayi Talebi , موسسه آموزش عالی پارس رضوی گنایاد ,
Dr. Seyed Mojtaba Mosavi Nezhad , دانشگاه بیرجند ,

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