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Full-Text Articles in Engineering
Seismically Induced Column Buckling In Special Concentrically Braced Frames In Steel Buildings, Noah Meisner
Seismically Induced Column Buckling In Special Concentrically Braced Frames In Steel Buildings, Noah Meisner
Master's Theses (2009 -)
Special concentrically braced frames (SCBFs) are efficient lateral-force-resisting systems that are specifically detailed for steel buildings in regions with high seismic hazard. Current design standards for SCBFs intend to ensure inelastic deformation capacity through strict ductile and capacity-based design requirements. Braces are intended to yield in tension and buckle in compression to dissipate seismic energy. The current standards apply expected brace forces to all framing elements and connections to concentrate yielding in the braces. In these standards it is conservatively assumed that brace yielding and buckling simultaneously occur on all stories, and columns are designed considering the accumulated brace demands …
Seismic Performance Comparison Of Ordinary Concentrically Braced Frames In The Western And Central United States, Matthew Waters
Seismic Performance Comparison Of Ordinary Concentrically Braced Frames In The Western And Central United States, Matthew Waters
Master's Theses (2009 -)
Ordinary concentrically braced frames (OCBFs) are intended to be moderately ductile steel seismic-force-resisting systems and are permitted in low-rise buildings in regions with high seismic hazards. There has been relatively little research to quantify the seismic performance of OCBFs, with most of the previous work emphasizing the role of reserve capacity on performance. To improve the understanding of seismic performance and validate current design provisions, a series of nonlinear response-history analyses were conducted. Two, three-story OCBF study buildings were designed in accordance with ASCE/SEI 7-16 for sites in Seattle, WA and Memphis, TN; the sites have relatively high seismic hazards …
Analysis Of Fatigue Crack Propagation In Welded Steels, Roberto Angelo Demarte
Analysis Of Fatigue Crack Propagation In Welded Steels, Roberto Angelo Demarte
Master's Theses (2009 -)
This thesis presents the study of fatigue crack propagation in a low carbon steel (ASTM A36) and two different weld metals (AWS A5.18 and AWS A5.28). Fatigue crack propagation data for each weld wire is of interest because of its use for predicting and analyzing service failures. Fatigue crack growth test specimens were developed and fabricated for the low carbon steel base metal and for each weld wire. Weld specimens were stress relieved prior to fatigue testing. Specimens were tested on a closed-loop servo hydraulic test machine at two different load ratios. Fatigue test data was collected to characterize both …
A Quantitative Study Of Robustness Characteristics In Steel Framed Structures, Christopher Herman Raebel
A Quantitative Study Of Robustness Characteristics In Steel Framed Structures, Christopher Herman Raebel
Dissertations (1934 -)
Robustness is a desirable property in any structural design. Robustness may be thought of as the building's inherent structural ability to resist loads other than those anticipated during design. Examples of unanticipated loads are damage to a column or beam due to impact; damage due to the concussion of a blast; strength reduction due to extreme heat during a fire; and localized accidental overload of a beam or column. Each of these events, although very different in their nature, has one major point in common; in each case the path of load resistance changes in a way that was not …
Risk-Based Seismic Design Optimization Of Steel Building Systems With Passive Damping Devices, Junshan Liu
Risk-Based Seismic Design Optimization Of Steel Building Systems With Passive Damping Devices, Junshan Liu
Dissertations (1934 -)
Nonlinear time history analysis software and an optimization algorithm for automating design of steel frame buildings with and without supplemental passive damping systems using the risk- or performance-based seismic design philosophy are developed in this dissertation. The software package developed is suitable for conducting dynamic analysis of 2D steel framed structures modeled as shear buildings with linear/nonlinear viscous and viscoelastic dampers. Both single degree of freedom (SDOF) and multiple degree of freedom (multistory or MDOF) shear-building systems are considered to validate the nonlinear analysis engine developed. The response of both un-damped and damped structures using the 1940 EI Centro (Imperial …