Investigation The Non-Linear Distribution of Shear Force in irregular Steel Structures

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Investigation The Non-Linear Distribution of Shear Force in irregular Steel Structures

ارائه دهنده: Provider: Yaser Babaei

اساتید راهنما: Supervisors: Dr . Mohammad Shushtari

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr . Mostafa Moghadasi- Dr. Amir Reazei Sameti

زمان و تاریخ ارائه: Time and date of presentation: 2024

مکان ارائه: Place of presentation: 44

چکیده: Abstract: The seismic force applied to a building is the shear of the 1st-story which is known as “base shear.” The base shear is distributed in plan and height to analyze and design the structure. Building codes calculate the base shear of the two perpendicular directions independently. The base shear of each direction is distributed among the frames perpendicular to the direction based on stiffness. Finally, the base shear of each frame is distributed in height using the given formula. The share of each story is assigned as the story force. The code-based distributions ignore 3D and nonlinear behavior, soil type effect, higher modes’ contribution, and lateral resisting system and irregularity effects. 3D and nonlinear base shear distribution for 3D steel structures has been investigated in previous works. The goal of this research is to investigate the effect of irregularity in plan and height on 3D nonlinear base shear distribution. Out-of-plane offset irregularity in plan and discontinuity in lateral force resisting system irregularity in height were chosen for the study. The structures were designed with 2 lateral force-resisting systems, 3 soil types, and 6 and 10 stories. Nonlinear time-history analyses were carried out on 24 structures using 3-component records. The results showed that irregularities make the 3D distribution of the shears and forces of the stories irregular too. Soil type, lateral force-resiting system, and structural height influence the distribution if the irregularity exists.

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