Investigation of Modeling Strategies for Slender Lightly Reinforced Concrete Shear Walls

A large number of pre-1980’s non-ductile reinforced concrete (RC) structures in California utilizing RC shear walls to resist seismic lateral forces have been identified as deficient by industry practitioners. These non-ductile wall systems are typically lightly reinforced and lack adequate boundary element detailing. Analytical studies suggest these walls are susceptible to brittle, compression-controlled failure modes due to damage from concrete crushing and bar buckling. Furthermore, poor behavior of lightly reinforced concrete walls was observed in many recent earthquakes, for example in Chile (1985), New Zealand (2010/2011) and Mexico (2017). This has generated concern among engineers in high seismic regions around the globe. This research report provides a comprehensive analysis of academic and industry standards for analyzing lightly reinforced concrete shear walls with low axial loads and no boundary elements. First, a comparison of two recent experimental testing programs of non-ductile concrete shear walls by de Sevilla et. al. and Lu et. al. is provided. Next, simplified pushover analyses by Priestley and ASCE 41-17 are compared to the experimental testing results of the abovementioned test programs. After creating a basis for quick, simple predictions, the authors pursued defining the necessary modeling and analysis parameters to create a sophisticated computer simulated model in PERFORM-3D. A parametric study was utilized to create final calibrations on static pushover analyses and cyclic load analyses of each test wall. PERFORM-3D modeling recommendations are provided to give industry practitioners a starting point for modeling nonductile concrete walls. Finally, the report ends on small academic and industry studies that will support future design-build-test preparations for large-scale testing at Cal Poly San Luis Obispo

Cable Suspended Structure-Antanas Panavas

This project is based on a roof system designed by Antanas Panavas. The design of the structure is a cable supported roof system that includes nonprismatic glulam beams. The structure itself is a self stressed system that has never been constructed and is still in the analysis stage. Project included analysis of the structure and a detailed process of how to model cables using SAP2000

The genetic architecture of the human cerebral cortex

The cerebral cortex underlies our complex cognitive capabilities, yet little is known about the specific genetic loci that influence human cortical structure. To identify genetic variants that affect cortical structure, we conducted a genome-wide association meta-analysis of brain magnetic resonance imaging data from 51,665 individuals. We analyzed the surface area and average thickness of the whole cortex and 34 regions with known functional specializations. We identified 199 significant loci and found significant enrichment for loci influencing total surface area within regulatory elements that are active during prenatal cortical development, supporting the radial unit hypothesis. Loci that affect regional surface area cluster near genes in Wnt signaling pathways, which influence progenitor expansion and areal identity. Variation in cortical structure is genetically correlated with cognitive function, Parkinson's disease, insomnia, depression, neuroticism, and attention deficit hyperactivity disorder

The genetic architecture of the human cerebral cortex

The cerebral cortex underlies our complex cognitive capabilities, yet little is known about the specific genetic loci that influence human cortical structure. To identify genetic variants that affect cortical structure, we conducted a genome-wide association meta-analysis of brain magnetic resonance imaging data from 51,665 individuals. We analyzed the surface area and average thickness of the whole cortex and 34 regions with known functional specializations. We identified 199 significant loci and found significant enrichment for loci influencing total surface area within regulatory elements that are active during prenatal cortical development, supporting the radial unit hypothesis. Loci that affect regional surface area cluster near genes in Wnt signaling pathways, which influence progenitor expansion and areal identity. Variation in cortical structure is genetically correlated with cognitive function, Parkinson's disease, insomnia, depression, neuroticism, and attention deficit hyperactivity disorder