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Seismic Performance Of Concrete Core Walls Reinforced With Shape Memory Alloy Bars, Emad A. Abraik, Salah El-Din F. El-Fitiany, Maged A. Youssef

Civil and Environmental Engineering Publications

Reinforced Concrete (RC) core walls are widely used to resist lateral loads because of their high flexural and torsional stiffnesses. Their seismic performance parameters, including residual displacement, floor acceleration, and residual in-plane rotation, were examined by many researchers. However, reports from previous earthquakes have highlighted the difficulties of repairs addressing their residual displacements and/or rotations. This paper addresses this problem by investigating the influence of self-centering superelastic shape memory alloy (SMA) bars on the seismic performance parameters of RC core walls. A case study building is analyzed, considering both steel and SMA reinforcement, for unidirectional and bidirectional seismic excitations. Different …

Performance-Based Design Of Rc Columns Using An Equivalent Standard Fire, Robert T. Kuehnen, Maged A. Youssef, Salah El-Din F. El-Fitiany

Civil and Environmental Engineering Publications

The extreme variability of natural compartment fires poses a significant challenge in the process of performance-based fire design. To reduce this variability, the severity of a natural fire can be related to that of a standard fire, known as a time equivalent (te). In this paper, the applicability of a time equivalent, previously derived based on the average internal temperature profile (AITP) that develops within reinforced concrete (RC) beams exposed to fire from three sides, is examined for RC columns exposed to fire from four sides. A parametric study is presented to examine the suitability of the …

Seismic Performance Of Modular Steel-Braced Frames Utilizing Superelastic Shape Memory Alloy Bolts In The Vertical Module Connections, Papia Sultana, Maged A. Youssef

Civil and Environmental Engineering Publications

In modular construction, individual modules are constructed at a controlled industrial environment before being transported to site. They are then connected horizontally and vertically to form a structure. The vertical connections can be achieved by welding or bolting the columns of stacked modules. This study investigates the seismic performance of modular steel-braced frames (MSBFs) connected vertically using superelastic shape memory alloy (SMA) bolts. The study also identifies the required locations of SMA connections, in a typical MSBF, to optimize its seismic performance in terms of maximum inter-story drift (MID), maximum residual inter-story residual drift (MRID), and damage scheme.

Performance-Based Design Of Rc Beams Using An Equivalent Standard Fire, Robert T. Kuehnen, Maged Youssef, Salah El-Din F. El-Fitiany

Civil and Environmental Engineering Publications

The design of buildings for fire events is essential to ensure occupant safety. Supplementary to simple prescriptive methods, performance-based fire design can be applied to achieve a greater level of safety and flexibility in design. To make performance-based fire design more accessible, a time equivalent method can be used to approximate a given natural fire event using a single standard fire with a specific duration. Doing so, allows for natural fire events to be linked to the wealth of existing data from the standard fire scenario.

In this paper, the use of an existing time equivalent method is reviewed and …