14448

1354 دكتري

دكتري

عمران

اصفهان : دانشگاه صنعتي اصفهان

1397

هجده، 184ص.: مصور، جدول، نمودار

مرتضي مدح خوان

كياچهربهفرنيا

فرهاد بهنام فر، امير مهرداد محمد حجازي، مريم داعي

1397/12/22

كتابنامه

عمران

مهندسي عمران

1397/12/26

ID1354 دكتري

5 3 5 قاب دوازده طبقه چهار دهانه 641 5 3 6 قاب دوازده طبقه چهار دهانه با مهاربندی مگا 741 5 3 7 قاب بیست و چهار طبقه چهار دهانه 051 5 3 8 قاب بیست و چهار طبقه چهار دهانه با مهاربندی مگا 051 5 4 الگوریتم ژنتیک بهبود یافته 351 5 4 1 قاب ده طبقه یک دهانه 451 5 4 2 قاب بیست و چهار طبقه سه دهانه 751 5 5 اثر 162 P Delta 5 5 1 قاب هشت طبقه یک دهانه 261 5 5 2 قاب ده طبقه یک دهانه 461 5 5 3 قاب دوازده طبقه یک دهانه 561 5 6 مقایسه وزن بهینه قاب با مثال های طراحی 861 5 6 1 قاب ده طبقه یک دهانه 861 5 6 2 مطالعه موردی ساختمان هفت طبقه فوالدی 071 فصل ششم جمع بندی و نتیجهگیری 6 1 مقدمه 371 6 2 نتیجهگیری 471 6 2 1 بررسی روش تحلیل 571 6 2 2 سیستم مهاربندی مگا 571 6 2 3 الگوریتم ژنتیک بهبود یافته 671 6 2 4 تاثیر 177 P Delta 6 3 پیشنهادات برای تحقیقات آینده 771 مراجع 871 چکیده انگلیسی 581 یارده

Optimization of Steel Frames with Mega Bracing Systems by Genetic Algorithm Mohammad Reza Baradaran mr baradaran@pa iut ac ir mohamadrezabaradaran@gmail com January 16 2019 Civil Engineering group College of Pardis Isfahan University of Technology Isfahan 84156 83111 IranSupervisor DR Morteza Madhkhan madhkhan@cc iut ac irAdvisor Dr Kiachehr Behfarnia kia@cc iut ac irAbstractThe lateral load systems provide the lateral stiffness of the structure against lateral loads including wind and earthquakes Today with the help of new lateral load systems in high risebuildings the height of structures has increased significantly In recent years new and variedsystems for the design of high rise buildings have been presented These include diagrid tubing outrigger central core systems and mega bracing systems The mega bracing systems by distributing braces at the height of the building provide an appropriate control of the lateraldisplacement of the structure and an acceptable lateral stiffness of the structure In this type ofsystem using a change in geometric arrangement efficiency of the system can be significantlyincreased Most studies on lateral load systems are analytical studies that focus on the angle ofbracing the angles of the diagrid systems the position of the belt truss as well as studies onmaterials and optimization studies on these systems have been neglected The purpose of thisresearch is to analyze design and optimize Mega bracing systems using genetic algorithm Inthis regard a program with more than 1750 lines based on 13 sub programs is presented usingthe MATLAB programming language to optimize mega bracing systems The proposedprogram uses genetic algorithms to optimize the frame The objective function is the weight ofthe frame Design constraints are considered in accordance with the design code of AISC 360 16 and AISC 341 16 The algorithm has also been improved by introducing changes to thegenetic algorithm s evaluation stage Using an improved genetic algorithm to optimize theframe reduces the volume of computational operations and increases the speed of convergenceof the optimal frame weight The effect of P Delta is also included in the program s analyticalsection For analysis three types of analysis including static analysis of the frame underexisting loads equivalent static analysis and spectral analysis were used The results show theimportance of spectral analysis of frames with increasing height and number of floors Afterreviewing the analysis the frames braced by the mega bracing System have been evaluated Inthis section the optimum shape of braces and the optimal weight of the frame are presented The results show that the optimum angle of the mega bracing systems is between 36 to 42degrees The optimum weight of the frame with mega bracing is reduced by at least 20 Animproved new genetic algorithm has also been introduced The new algorithm presented in thepopulation assessment and control constraints if any of the constraints are violated improvesthe selected population to move the search region from the unacceptable region to theacceptable region This transition leads to an increase in the speed of convergence of theoptimal frame weight and a reduction in the volume of computational operations In the finalsection of the research the effect of P Delta on the optimal design of the frame has beeninvestigated The results of the P Delta analysis show that the application of the secondarymoment leads to an optimal weight gain of the frame and provides a more realistic design forthe frames Keywords Optimization Genetic Algorithm Steel Frame Mega Braced Systems 185

مرتضي مدح خوان

كياچهربهفرنيا

فرهاد بهنام فر، امير مهرداد محمد حجازي، مريم داعي