Ahmad Itani's research while affiliated with University of Nevada, Reno and other places

Publications (20)

Article
This paper presents the discussion and results from the first shake table test of a steel girder bridge system constructed using accelerated bridge construction (ABC) techniques. The bridge model was tested at the multi-shake table testing facility at the University of Nevada, Reno. The objective of this study was to evaluate the seismic performanc...
Article
A prerequisite to the implementation of accelerated bridge construction (ABC) in moderate and high seismic regions is reliable data proving that bridges constructed by assembling precast elements can emulate the seismic performance of cast-in-place bridges. Previous seismic studies have not provided sufficient information about the interaction of c...
Article
Shake-table studies were conducted on a large-scale, two-span accelerated bridge construction (ABC) bridge model that incorporated 38 precast concrete elements and six emulative ABC connection types. The studies were aimed to assess the seismic performance of the bridge model and the six ABC connections under biaxial horizontal ground motions simul...
Article
Synopsis: Ultra-High Performance Concrete (UHPC) is a versatile building material as it is characterized by very high compressive strengths reaching 30 ksi [200 MPa], ductile tensile characteristics, and energy absorption. Currently, UHPC is commonly used in limited structural applications, such as joints and connections between precast structural...
Article
The goal of this study was to evaluate two connection types for reinforced concrete two-way rebar hinges and to assess their seismic performance if incorporated in accelerated bridge construction applications. Two large-scale models of bridge systems were tested on shake tables; the first utilized a pocket connection with the opening preformed in t...
Article
Full-text available
A large-scale, two-span bridge model constructed by assembling precast elements was tested under a series of bi-axial ground motions simulated on a shake table at the Earthquake Engineering Laboratory at the University of Nevada, Reno. The response of the bridge was estimated before the tests using a three-dimensional computational model developed...
Article
This paper presents pretest analysis of a shake table test model of a 0.35-scale, two-span, steel plate girder bridge. The objective of pretest analysis was to obtain an insight on the seismic response of the bridge model during the shake table tests. The bridge included seat type abutments, full-depth precast deck panels, and a two-column bent in...
Conference Paper
Full-text available
La construcción acelerada de puentes (CAP) ha sido ampliamente utilizada en proyectos de infraestructura vial, en especial en los Estados Unidos. Este método resuelve los problemas asociados con los tiempos relativamente largos de la construcción convencional (vaciado en sitio), puesto que se emplean elementos o componentes prefabricados que son co...
Conference Paper
Full-text available
Ultra-High Performance Concrete (UHPC) is a versatile building material as it is characterized by very high compressive strengths reaching 200 MPa (30 ksi), ductile tensile characteristics, and energy absorption. Currently, UHPC is commonly used in small structural applications, such as joints and connections between precast structural elements. Ho...
Article
This study conducts shake table studies and analysis of a large-scale novel posttensioned (PT) precast bridge column connected to a precast footing with a pocket connection. The primary objective is to develop a resilient square precast bridge column with minimal residual lateral displacement and plastic hinge damage when subjected to strong earthq...
Conference Paper
This paper presents pretest analysis of a shake table test model of a one-third scale, two-span, steel plate girder bridge. The objective of pretest analysis was to obtain an insight on the seismic response of the bridge model during the shake table tests. The bridge incorporates a two-column bent, seat type abutments, and full-depth precast deck p...
Conference Paper
Full-text available
Recent major earthquake events that occurred in the Indian Ocean (2004), Chile (2010) and Japan (2011) generated tsunami waves of significant heights, which inundated nearby coastal cities causing extreme destruction and loss of human lives. These waves inundated a large number of bridges, damaged the connections of the superstructure to the substr...
Conference Paper
Full-text available
In this study large scale hydraulic experiments of tsunami waves impacting a straight composite I-girder bridge were conducted in the LWF at Oregon State University. Both solitary waves and turbulent bores were tested and the experimental results revealed the existence of 4 different phases in the vertical force histories, among which is (i) a phas...
Conference Paper
Full-text available
Seismic response of a posttensioned precast bridge column connected to a precast footing using pocket connection was investigated in this study. The objective was to develop a damage free precast bridge column with reliable and resilient connection. The precast column was post tensioned with unbonded carbon fiber reinforced polymer (CFRP) tendons t...

Citations

... Thus, to prevent the formation of cold joints between two consecutive casts in a single column, all the UHPC casts were poured from the same position and the crust formed on top of the former UHPC batch was loosen using a wooden piece before poring the next batch to ensure continuity between the pours and allow for fibers to bridge between the UHPC casts. It is thus worth noting that the research team has leveraged extensive experience and lessons learned in UHPC mixing to ensure consistent and proper UHPC furnishing [18][19][20][21]. ...
... Earthquakes pose significant demand to the structures, where the LWC are expected to undergo significant cyclic response during strong earthquake shaking. The design of NWAC structures under cyclic loading has been investigated in numerous researches [48][49][50][51][52]. Notable knowledge has been gained on the seismic performance of NWAC components under cyclic loading, some of which has been reflected in the design codes. ...
... Results showed that the pocket connection is effective in forming the plastic hinge in the column with no connection damage. Jones et al. [19] tested two large-scale models of bridge systems-utilized socket connection and pocket connection, respectively, on shake tables, and the results indicated that both exhibited satisfactory seismic behavior and are appropriate for use in high seismic areas. ...
... In recent years, OpenSees has seen an increase usage in bridge engineering research studies (Scott et al., 2008;Wang et al., 2017). The element library of OpenSees caters to a wide variety of bridge modelling techniques; from a simple one-dimensional (1-D) line model consisting of linear beam elements (Almutairi et al., 2016), to comprehensive nonlinear three-dimensional (3-D) models (Benjumea et al., 2020). On the other hand, bridge deck analysis is a vital part of both research and practice in bridge design and assessment. ...
... Three concrete models-including Concrete02, Concrete01withSTIC, and Concrete04-are commonly used in OpensSees models. A parametric study conducted by Mehraein [2016] and an analytical study on bridge modeling by Shoushtari et al. [2020] showed that the Concrete02 model resulted in fewer convergence issues compared to the other two models. It was also shown that the effect of different hysteretic behavior of each concrete model on the global response of member is negligible. ...
... The aforementioned strategy was applied to bridges by Shoushtari et al. (2019) [19,22] at Northridge-Sylmar earthquake, and tested experimentally and analytically. They simulated six types of ABC connection and their results were comparable to cast-in-place bridges. ...
... Detailed presentation and discussion of the measured data, analytical studies, and design implications of the study are beyond the space limits of this paper and are provided elsewhere (Shoushtari et al. 2017;Shoushtari et al., "Seismic performance of a two-span steel girder bridge with ABC connections under earthquake loading," working paper, University of Nevada, Reno, Reno, Nevada; Shoushtari et al., "Numerical modeling and seismic design of steel girder bridge system with ABC connections," working paper, University of Nevada, Reno, Reno, Nevada). Presenting the three primary components of this paper (design, construction, and observed damage) is of significant benefit to designers and researchers. ...
... The general promise of CFRP tendons is their noncorrosive, nonmagnetic, high strength, and light weight properties. Figure 5 shows CFRP tendons used in a study to evaluate the seismic response of a posttensioned column using CRFP tendons and UHPC in plastic hinges by Mohebbi et al. (2015Mohebbi et al. ( , 2016. (Mohebbi et al., 2015(Mohebbi et al., , 2016 ...
... To further accelerate construction, precast concrete dualshell columns [22], and FRP filled concrete columns have also been tested under cyclic loading [10,11]. Large scale quasi-static and shake table tests have demonstrated the superior performance of rocking columns; negligible damage to the columns was observed for the design level earthquake [23][24][25][26][27]. Wang et al. [27] used scaled models of precast columns with post-tensioning strands to show that prestressing enhanced base shear capacity and self-centering ability; simplified numerical models were generated using concentrated plasticity spring elements to model the self-centering hinge. ...
... Another influential experimental investigation using a 1:10th scale model of periodic wave impact on a bridge was conducted in [16]. Additionally, the analysis of the impact of the solitary wave on straight bridge decks was performed in larger-scale (1:5) experiments in [17,18]. A modification of the solitary wave generation method proposed by [19] was proposed by [20]. ...