Investigation of stored seismic energy in regular steel structures

نوع: Type: Thesis

مقطع: Segment: masters

عنوان: Title: Investigation of stored seismic energy in regular steel structures

ارائه دهنده: Provider: Tahereh Gharabaghi

اساتید راهنما: Supervisors: Dr. Mohammad Shoshtari

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr.Moghadasi - Dr.Rezaei

زمان و تاریخ ارائه: Time and date of presentation: 2025

مکان ارائه: Place of presentation: 43

چکیده: Abstract: Given advancements in science and the growing need for a more precise understanding of structural behavior during earthquakes, a novel energy-based approach, employing dynamic simulations, offers a more realistic portrayal of structural performance. By focusing on the dynamic nature of earthquakes and utilizing energy as a central parameter, this method provides a more accurate assessment compared to conventional static analysis methods. This research delves into the seismic energy stored within three-dimensional steel structures. The study analyzed 18 steel structures encompassing three distinct structural systems (two-way braced, two-way moment frame, and one-way moment frame with bracing on the opposite side) and three soil types (B, C, D). The findings reveal that the structural system exerts a substantial influence on the distribution of seismic energy across different floors. In two-way braced structures, seismic energy is predominantly absorbed by higher floors, whereas in moment frames, this concentration is observed in lower floors. Moreover, the soil type plays a crucial role in seismic energy absorption; stiffer soils, owing to their greater resistance to deformation, dissipate more energy, while softer soils absorb less energy. Additionally, earthquake parameters impact the seismic behavior of structures but cannot be solely relied upon as comprehensive indicators for predicting the amount of absorbed energy. The base shear force is likewise influenced by the structural system. Two-way braced systems experience the least base shear, while one-way braced systems encounter the most. Moment frames, due to their lower stiffness and dominant flexural mechanism, exhibit a base shear intermediate between the two braced system states. An examination of the relationship between base shear and absorbed energy in various structures demonstrates that in two-way braced structures, the amount of absorbed energy fluctuates considerably with increasing base shear, particularly in softer soils. Conversely, moment frames absorb a nearly constant amount of energy until a certain threshold, beyond which the absorbed energy increases abruptly. Hybrid structures exhibit an intermediate behavior between the two aforementioned structural types. In conclusion, the research findings indicate that various factors, including the structural system, soil type, and design earthquake, influence the distribution of seismic energy within steel structures. Comprehending these factors empowers structural engineers to design structures that exhibit enhanced performance during earthquakes.

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