Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 18 of 18 for “"Plastic Hinges"”.
-
Redistribuição de momentos fletores em estruturas hiperestáticas
… and experimental work on the application of plastic analysis to statically indeterminate reinforced concrete structures are presented herein. Fourteen two-span contiuos beams were tested to failure. These beams were dimensioned according to bending moment diagrams differing in 15% and 25% …
-
Active control of passive safety in passenger motor vehicles : a feasibility study investigating dynamic denting of members using pyrotechnic devices
… dent and hence the distance between the plastic hinges was increased and instabilities in the crushing process were introduced. Holes (without any visible denting) decreased the distance between the plastic hinges and thus also induced instabilities. In both cases the tubes tended to skew …
-
The Effectiveness of Seismically Designed Steel Framing Systems Subjected to Blast Loading
… Failure modes are investigated through a plastic hinge analysis and member failure comparison. Also, a global response analysis is observed through comparison of roof deflections and accelerations. The impact of structural geometric irregularity is also investigated. Vertical setback and …
-
Dimensionamento plástico de edifícios de andares múltiplos, em aço
This work presents a review of the theory of plastic design of multistory steel frames and develops a computer program to implement the automatic design of column, girders and bracings. The plastic design utilizes the ductility, which is a inherent structural steel property, and the redistribution …
-
Experimental Studies of Reinforcing Steel and Shape Memory Alloys in Mechanically Spliced Connections for Seismic Application
… reinforcing bar splices for use in the plastic hinge of a bridge column for use in accelerated bridge construction (ABC). The implementation of couplers in a plastic hinge for ABC is not unique, however coupler application has been limited to regions of low seismic hazard due to lack of …
-
Design of innovative dynamic systems for seismic response mitigation
… dissipation by activating the maximum number of plastic hinges throughout the structure. This is a useful response mitigation system, but suffers from some difficulties, stemming primarily from the considerable mass of the wall. Those difficulties are notably expensive foundations, and very high …
-
Simultaneous effect of slenderness, spatially varying excitation and support flexibility on dynamics of rocking bridges
In conventional bridge design, plastic hinges are permitted at predetermined locations to have controlled damage. However, this damage can cause the loss of bridge functionality and severely disrupt rescue efforts. The subsequent downtime and repair costs can be unpredictable. Recently, an …
-
Stochastic and seismic design response of linear and nonlinear structures
… buildings and for two dimensional frames with plastic hinges. For this purpose, a generalized modal analysis technique is successfully employed. The proposed response spectrum approaches require the input be defined in terms of the response spectrum of first order oscillators as well as in …
-
Parametric analysis of progressive collapse in high-rise buildings
… diminished throughout the building allowing less plastic hinges to form. This result was common in all three structural models with the braced frames exhibiting a better structural response to local failure in comparison to moment frame buildings. The study identifies the advantage of implementing …
-
Seismic Behavior of concrete filled steel Tubular Built-up columns
… agree with experimental data. In addition, the plastic hinges were predicted under transverse and longitudinal excitation respectively, revealed that CFST built-up columns has a favorable seismic performance.
-
Seismic Performance of Square Nickel-Titanium Reinforced ECC Columns with Headed Couplers
… costs to a minimum by reducing damage to column plastic hinges and minimizing residual drifts. These objectives can be accomplished by using innovative materials such as Nickel-Titanium shape memory alloy bars (SMA) and engineered cementitious composites (ECC). This study focused on evaluating …
-
Creep characterization of single crystal silicon in support of the MIT Micro-Engine Project
… deformation proceeded via the formation of "plastic hinges" at the inner loading points. The localized nature of the creep response is not amenable to the application of standard continuum power law models, however an empirical LarsonMiller fit was applied in order to provide some guidance …
-
Modelling the Post-Peak Response of Existing Reinforced Concrete Frame Structures Subjected to Seismic Loading
… and shear deformations inside the potential plastic hinges, the distribution of flexural and shear flexibility along the element, as well as the location and extent of post-peak shear damage, without relying on assumptions about the bending moment distribution and avoiding shortcomings of …
-
Behaviour and modelling of the inelastic response of concrete and steel-concrete infrastructures subjected to low-cycle fatigue
… of reinforcing concrete and the developing of plastic hinges. With the aim of providing information on the structural safety of a tunnel after an earthquake, a damage index was calculated. In this respect, a nonlinear fiber F.E. model in the OpenSEES environmental was developed. This model …
-
Multi-objective optimal seismic design of buildings using advanced engineering materials
… is deployed only at the critical locations (e.g. plastic hinges) to improve seismic performance. It is found that both the initial and LCC of frames that use ECC are lower due to savings in material and labor cost of transverse reinforcement for the former and due to increased capacity and reduced …
-
Study of the I-35W Highway Bridge Collapse Mechanism
The Deck truss portion of the I-35W Highway Bridge in Minneapolis, Minnesota collapsed on August 1, 2007 while roadwork was underway on the bridge. The entire truss was recovered from the river to study the causes of failure. The National Transportation Safety Board attributes the collapse to …
-
Thermally-induced ratcheting behaviour of laterally-loaded reinforced concrete energy piles in sand
… by forming realistic tension crack patterns, and plastic hinges and (2) give hardening responses upon horizontal loading. The effectiveness of three different soil constitutive models, from simple elastic-perfectly plastic, to strain hardening, and strain softening was evaluated. The soil …
-
Structural performance of perforated steel beams with novel web openings and with partial concrete encasement
… newly formed composite beams. Detailed study of plastic hinges formation (i. e. high stress concentrations) was also employed in the vicinity of the web openings, by conducting both experimental and finite element (FE) investigation. This research study should now lead to better management of the …