Abstract The Teachers Integrating Engineering into Science (TIES) Program is a collaborative project among faculty from the College of Education and at University Nevada, Reno. TIES paired university with middle school science teachers to create three units that included engineering design using variety interactive learning activities in order engage wide range students. Web‐based simulation activity, lesson plans, project, types assessments were standardized across schools. Results...

Plate steel shear links offer enhanced design freedom, including the ability to use grades that are not available in rolled shapes. This paper discusses cyclic response of five types designed using ranged from 485 100 MPa yield strength. The and subsequent performance was categorized into two groups; conventional those without stiffeners low point steels. Ductile failure modes desirable hysteretic behavior resulted efficient energy dissipation were observed for all specimens. reached...

This paper discusses the superelastic behavior of shape memory alloy, Nitinol (NiTi), when used as reinforcement in concrete beams. The ability NiTi to recover and reduce permanent deformations beams was investigated. Small-scale beams, with were tested under half-cycle loads. ratio varied from 0.1 about 0.9%. experimental results showed that average residual displacement reinforced less than one-fifth steel test stiffness however lower those An analytical study load–deflection relationship...

This study conducts shake table studies and analysis of a large-scale novel posttensioned (PT) precast bridge column connected to footing with pocket connection. The primary objective is develop resilient square minimal residual lateral displacement plastic hinge damage when subjected strong earthquakes. Another evaluate column-footing unbonded carbon fiber–reinforced polymer (CFRP) tendons eliminate permanent drifts. To mitigate seismic damage, ultra-high performance concrete (UHPC) used in...

Severe damage to acceleration sensitive nonstructural components in recent earthquakes has resulted unprecedented losses. Recent research been aimed at increasing the understanding of demands on buildings. This investigation subjects a set four special moment resisting frame (SMRF) building models suite 21 far-field ground motions using incremental dynamic analysis procedure. Full three-dimensional including floor slabs are used extract both horizontal and vertical responses. Floor response...

Shake table experiments and analyses of a large-scale precast two-column bent with advanced materials in plastic hinge zones were conducted to develop bridge bents for use accelerated construction (ABC) moderate high seismic zones. Ultrahigh performance concrete (UHPC) engineered cementitious composite (ECC) used column reduce earthquake damage. Precast square columns connected footing cap beam using pocket (also known as socket) connections. The primary objectives this investigation...

Abstract Scalable fabrication concepts of 3D kidney tissue models are required to enable their application in pharmaceutical high-throughput screenings. Yet the reconstruction complex structures remains technologically challenging. We present a novel concept reducing demands, by using controlled cellular self-assembly achieve higher complexities from significantly simplified construct designs. used drop-on-demand bioprinting fabricate locally confined patterns renal epithelial cells embedded...

Ductile end cross frames have been proposed in the past for seismic design of steel plate girder bridges. In this paper buckling-restrained braces (BRBs) are investigated as ductile and compared against performance yielding X braces. Component experiments on BRBs showed that these dissipated energy very efficiently stable hysteretic behavior. Shake-table a large scale bridge model with both pin-ended connections fixed-end connections. Despite slippage, considered more effective flexural...

The seismic characteristics of welded and threaded hospital piping assemblies were investigated with without restrainers under various intensities loading using a biaxial shake table. Experimental results showed that the limited displacements; however, they did not reduce acceleration responses. No leakage was detected in assembly up to drift ratio 4.3%; suffered minor leaks at 2.2% experienced connection failure 4.3%. A simplified computational model developed calibrated experimental data...

A 0.4-scale model of a three-span, seismically isolated, curved steel I-girder bridge was tested on multiple shake tables. The isolation system consisted 12 lead-rubber isolators. is highly with total subtended angle equal to 104° (1.8 radians). objectives this study were: (1) investigate the effect curvature seismic response an isolated bridge, (2) evaluate performance reinforced concrete (R/C) columns during design-level earthquake using isolation, and (3) determine failure limit states...

Horizontally curved bridges were investigated following a statistical evaluation of typical details commonly used in the United States. Both seismically and non-seismically designed are considered where primary differences column confinement, type bearings abutment support length. Columns found to be most vulnerable components for both categories. Central angle was identified as an important factor that increases demand on various components, particularly columns. Furthermore, larger angles...

This paper presents a new design concept and procedure for seismic resistant special truss‐moment frames, which have been validated by full‐scale tests on full‐span truss‐column subassemblages. The results in increased economy excellent inelastic response with stable hysteretic behavior of the trusses moment frames when subjected to severe earthquake motions. also has an added advantage that structure can be retrofitted after major simply replacing damaged web members segments floor trusses....

This study presents an experimental investigation on the magnetorheological effect of a new elastomer–based adaptive bridge isolation bearing system. Two identical bearings (isolators) were designed and fabricated. Electromagnets incorporated to create closed-loop magnetic path in elastomer layers. A double-lap shear compression test setup was utilized characterize mechanical properties system subjected scaled structural cyclic forces strains. Experimental results demonstrated that effective...

Analytical fragility curves were developed for curved single-frame concrete box-girder bridges with seat-type abutments. The incorporated the current seismic design considerations and modern details that recently adopted by CALTRANS. Fragility demonstrated columns most vulnerable components, while successfully protected abutment piles from damage during large earthquakes. Increasing subtended angle affected vulnerability at both component system levels. Functional relationships proposed to...

A shake table experiment of a large-scale, two-span accelerated bridge construction (ABC) model with steel superstructure incorporating six the more promising ABC connections was conducted on tables at University Nevada, Reno. The objective to investigate seismic performance integrated into system and determine whether bridges can demonstrate adequate load path, integrity, constructability. subjected successive bidirectional motions simulating modified version Northridge 1994 earthquake...

This article introduces a generic modeling approach that is suitable for static and dynamic analysis, response assessment of highway bridges with varying levels irregularities. The proposed recommendations are based on grillage rules allows explicit representation various types details components. validity accuracy the demonstrated against three-dimensional finite element models as well experimentally recorded benchmark bridges. While achieving remarkable accuracy, required analysis time was...

This paper investigates the seismic response of skewed bridges using comprehensive data set obtained from a family shake table experiments. To begin, influence friction along abutment on in-plane rotation is evaluated. Then expansion gap size, type ground motion (near field and far field), input direction described. It shown that once impact occurs between bridge back wall, significant forces can be generated normal to wall due in plane through friction. These cause otherwise symmetrical...

Recent earthquakes exposed the vulnerabilities of steel plate girder bridges when subjected to ground shaking. This paper discusses behavior during recent such as Petrolia, Northridge, and Kobe. The also experimental analytical investigations that were conducted on their components. Results these showed importance shear connectors in distributing transferring lateral forces end intermediate cross frames. Also, potential using frames ductile elements can be used dissipate earthquake input...

Ductile end cross frames have been proposed in the past as a seismic design and retrofit strategy for steel plate girder bridges. In this paper it is shown that with good connection details, single angles are able to undergo large cyclic deformations excess of 6% average axial strain before failure occurs. Large-scale shake table experiments were performed on straight I-girder bridge model evaluate performance superstructure ductile using angle X braces. The exhibited no apparent overall...