Open Access. Powered by Scholars. Published by Universities.®
Durham School of Architectural Engineering and Construction: Dissertations, Thesis, and Student Research
Articles 1 - 2 of 2
Full-Text Articles in Architecture
Subjective Perception Of Varying Reflection Densities In Room Impulse Responses, Hyun Hong
Subjective Perception Of Varying Reflection Densities In Room Impulse Responses, Hyun Hong
Durham School of Architectural Engineering and Construction: Dissertations, Thesis, and Student Research
Reverberation time (RT) is a metric commonly used to describe room acoustic conditions, but different rooms which have the same reverberation time can have different reflection densities. Much less is known about how humans perceive different reflection densities and how sensitive humans are to changes in reflection density. Previous investigations in the existing literature have studied the upper limit of distinguishable reflection density using artificial impulse responses, but not with more realistic impulse responses simulated in room acoustic software or measured from real rooms. The aim of this dissertation is to investigate methods for quantifying reflection density from measured impulse …
A Composite Structural Steel And Prestressed Concrete Beam For Building Floor Systems, Nathan Dewit
A Composite Structural Steel And Prestressed Concrete Beam For Building Floor Systems, Nathan Dewit
Durham School of Architectural Engineering and Construction: Dissertations, Thesis, and Student Research
Precast prestressed concrete beams, such as rectangular and inverted tee beam, currently used in residential and commercial buildings are deep, heavy, and limited to span-to-depth ratios of 15. The research proposes a composite structural steel and prestressed concrete beam that is shallow, light, easy to produce and erect, and able to achieve a span-to-depth ratio of 24. The proposed beam is designed to be used with precast columns, hollow-core planks, and a cast-in-place topping to create a moment-resisting floor system that minimizes the need for shear walls. The goal of this system is to eliminate as many of the limitations …