Bridge Structures最新文献_第5页

Prioritization of Texas prestressed concrete bridges for future truck platoon loading 德克萨斯州预应力混凝土桥梁未来卡车排装载的优先顺序

IF 0.6

Bridge Structures Pub Date : 2021-03-29 DOI: 10.3233/BRS-210181

Nandhu Pillay Thulaseedharan, M. Yarnold

{"title":"Prioritization of Texas prestressed concrete bridges for future truck platoon loading","authors":"Nandhu Pillay Thulaseedharan, M. Yarnold","doi":"10.3233/BRS-210181","DOIUrl":"https://doi.org/10.3233/BRS-210181","url":null,"abstract":"Autonomous truck platoons shall soon be traveling our highway system with greater frequency. The objective of the presented study is to conduct a high-level evaluation of the Texas concrete bridge inventory when subjected to potential truck platoon loading. The National Bridge Inventory (NBI) database is utilized to the greatest extent possible. In addition, a significant literature review is performed to make assumptions allowing estimated load rating calculations for the prestressed concrete bridges likely to support future platoons (nearly 3,000 bridges). The truck platoon load ratings, combined with the NBI structural evaluation condition ratings, are utilized to prioritize each bridge. As a result, bridges are identified for more detailed evaluation prior to future truck platoon implementation. Data analysis was also performed to further understand the impact of various parameters on the load rating and prioritization results. Conclusions were drawn regarding the sensitivity of the (1) original design methodology, (2) bridge span length, (3) truck type, (4) truck spacing and (5) number of trucks within a platoon. In addition, a secondary benefit of the study is a presented framework for other bridge owners to prioritize their bridges that may be subjected to truck platoon or other heavy vehicle loading.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-210181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48053975","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Accelerated testing of super lightweight UHPC waffle deck under heavy vehicle simulator 超轻型UHPC华夫格板在重型车辆模拟器下的加速试验

IF 0.6

Bridge Structures Pub Date : 2021-01-16 DOI: 10.3233/BRS-200176

S. Ghasemi, A. Mirmiran, Yulin Xiao, K. Mackie

{"title":"Accelerated testing of super lightweight UHPC waffle deck under heavy vehicle simulator","authors":"S. Ghasemi, A. Mirmiran, Yulin Xiao, K. Mackie","doi":"10.3233/BRS-200176","DOIUrl":"https://doi.org/10.3233/BRS-200176","url":null,"abstract":"A super lightweight deck can enhance load rating and functionality of a bridge, especially those identified as structurally deficient. This study was aimed to develop and experimentally validate a novel bridge deck as an ultra-lightweight low-profile waffle slab of ultra-high-performance concrete (UHPC) with either carbon fiber reinforced polymer (CFRP) or high strength steel (HSS) reinforcement. The proposed system lends itself to accelerated bridge construction, rapid deck replacement in bridges with load restrictions, and bridge widening applications without the need to replace girders. Performance and failure modes of the proposed deck were initially assessed through extensive lab experiments and finite element analysis, which together confirmed that the proposed deck panel meets the AASHTO LRFD requirements. The proposed deck system is not susceptible to punching shear of its thin slab and fails in a rather ductile manner. To evaluate its long-term performance, the system was further tested under the dynamic impact of wheel load at the Accelerated Pavement Testing (APT) facility of the Florida Department of Transportation using a Heavy Vehicle Simulator (HVS).","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-200176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41663201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Investigating the effects of combinations of irregularities on seismic ductility demands and mean response for four-span RC bridges considering displacement direction 研究考虑位移方向的不规则组合对四跨钢筋混凝土桥梁抗震延性要求和平均响应的影响

IF 0.6

Bridge Structures Pub Date : 2021-01-16 DOI: 10.3233/BRS-200173

M. Sajed, P. Tehrani

{"title":"Investigating the effects of combinations of irregularities on seismic ductility demands and mean response for four-span RC bridges considering displacement direction","authors":"M. Sajed, P. Tehrani","doi":"10.3233/BRS-200173","DOIUrl":"https://doi.org/10.3233/BRS-200173","url":null,"abstract":"The effects of combinations of different types of irregularities have not been studied in details in the past and current seismic design codes do not address this issue appropriately. In this research, 76 regular and irregular bridges with irregularities in both superstructure and substructure were designed and evaluated to investigate the impact of combinations of irregularities on the seismic ductility demands. The irregularity parameters considered in this study include irregularities in span arrangement, different lengths of columns, different abutments support conditions and different stiffness of superstructure. The bridges were designed and checked according to AASHTO provisions. Inelastic time history analysis was conducted using OpenSees software and ductility demands in bridge columns for different bridge configurations were predicted. Predictions of ductility demands were based on the mean responses obtained using a number of ground motion records. Finally, the effect of considering displacement directions in predicting the mean bridge response (i.e., using different methods for predicting the mean response) for irregular and regular bridges was investigated. The results indicate that the combinations of irregularities can significantly increase the ductility demands in some cases compared to the case of regular bridges.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-200173","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44620663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Editorial 社论

IF 0.6

Bridge Structures Pub Date : 2021-01-16 DOI: 10.3233/brs-200177

K. Mahmoud

引用次数: 0

Rocking isolation of bridge pier using shape memory alloy 形状记忆合金对桥梁桥墩隔震性能的影响

IF 0.6

Bridge Structures Pub Date : 2021-01-16 DOI: 10.3233/BRS-200174

Rajesh R. Rele, Ranjan Balmukund, S. Mitoulis, S. Bhattacharya

{"title":"Rocking isolation of bridge pier using shape memory alloy","authors":"Rajesh R. Rele, Ranjan Balmukund, S. Mitoulis, S. Bhattacharya","doi":"10.3233/BRS-200174","DOIUrl":"https://doi.org/10.3233/BRS-200174","url":null,"abstract":"The conventional design philosophy of bridges allows damage in the pier through yielding. A fuse-like action is achieved if the bridge piers are designed to develop substantial inelastic deformations when subjected to earthquake excitations. Such a design can avoid collapse of the bridge but not damage. The damage is the plastic hinge formation formed at location of maximum moments and stresses that can lead to permanent lateral displacement which can impair traffic flow and cause time consuming repairs. Rocking can act as a form of isolation by means of foundation uplifting which act as a mechanical fuse, limiting the forces transferred to the base of the structure. In this context, this paper proposes a novel resilient controlled rocking bridge pier foundation, which uses elastomeric pads incorporated beneath the footing of the bridge piers and external restrainer in the form of shape memory alloy bar (SMA). The rocking mechanism is achieved by restricting the horizontal movement of footing by providing stoppers at all sides of footing. The pads are designed to remain elastic without allowing their shearing. The pier, the footing and the elastomeric pads are assumed to be supported on firm rigid concrete sub base resting on hard rock. By performing nonlinear dynamic time history analysis in the traffic direction of the bridge, the proposed pier with the novel resilient foundation is compared against a fixed-based pier and classical rocking pier (CC). The proposed pier rocking on elastomeric pads and external restrainer (CP+SMA) has good re-centering capability during earthquakes with negligible residual drift and footing uplift. In this new rocking isolation technique, the forces in the piers are also reduced and thus leading to reduced construction cost with enhanced post-earthquake serviceability.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-200174","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41839680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Effect of moisture on mechanical characteristic of soil and interaction of soil-pile in integral abutment bridges 水分对整体式桥台土力学特性及土桩相互作用的影响

IF 0.6

Bridge Structures Pub Date : 2021-01-16 DOI: 10.3233/BRS-200175

J. Razmi

{"title":"Effect of moisture on mechanical characteristic of soil and interaction of soil-pile in integral abutment bridges","authors":"J. Razmi","doi":"10.3233/BRS-200175","DOIUrl":"https://doi.org/10.3233/BRS-200175","url":null,"abstract":"Mechanical properties of soil are function of many parameters. Moisture content is one of the key factors that impact the soil’s mechanical properties. Soil-pile interaction and pile displacement in bridges can, therefore, be impacted by the moisture content. In particular, pile displacement in Integral Abutment Bridges (IABs) due to daily and seasonal temperature variations is a problem that has been under investigation. IABs don’t have joint and as a result all the load and deformation in the slab is transferred to piles. If piles are deformed beyond their yield point, plastic deformation can occur. The objective of this study is to evaluate the moisture content effect on the interaction of pile and soil and the resulting pile displacement through computational modeling. An ANSYS Finite Element Model (FEM) is used to repeatedly change the moisture content of the soil and adjust the properties and compute the displacement in the piles. It is shown that increasing the moisture content decreases several key parameters such as bulk density, young’s modulus, cohesion and Poisson’s ratio. The simulation results indicate higher displacements of the piles as the moisture content increases. This behavior can be explained by decreased elastic modulus. As a result, soil behaves more flexible and allows more displacement of the pile.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-200175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47733390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical investigation on redundancy of bridges with AASHTO I-girders AASHTO工字梁桥梁冗余度的数值研究

IF 0.6

Bridge Structures Pub Date : 2021-01-01 DOI: 10.3233/BRS-210187

Emran Alotaibi, N. Nassif, M. Alhalabi, H. Sebai, Samer M. Barakat

{"title":"Numerical investigation on redundancy of bridges with AASHTO I-girders","authors":"Emran Alotaibi, N. Nassif, M. Alhalabi, H. Sebai, Samer M. Barakat","doi":"10.3233/BRS-210187","DOIUrl":"https://doi.org/10.3233/BRS-210187","url":null,"abstract":"Bridge safety is one of the most critical concerns among civil engineering fields due to its high importance. The redundancy of bridges was heavily investigated in the literature; however, they were focused on twin girder redundancy cases. Additionally, literatures were scarce in studies that focused on the improvement that should be made to achieve redundancy systems in different AASHTO I-girder types. Thus, this study focused on assessing the additional required number of tendons for different AASHTO I-girder types and spacing between them to achieve the redundancy of I-girder bridges. The additional unbonded tendons are suggested to be added externally or internally. The parameters varied in this study are compressive strength of ultrahigh-performance concrete (UHPC), spacing between girders (i.e. number of girders) and type of girders. Leap Bridge Concrete software was used to simulate the required structural modes. After performing extensive numerical analyses following AASHTO LRFD guidelines, the results have shown that in case of the removal of external I-girder, the tendons in the nearest girder need to be nearly increased by 1.85 to 2.3 times compared to the original design, depending on spacing, compressive strength, and the number of girders. On the other hand, in the case of interior girder removal, the number of tendons in the nearest two girders need to be increased by 1.24 to 1.32 times the original design. The effect of compressive strength variation of the used UHPC was negligible compared to spacing and type of girder. It is worth mentioning that all simulations in this study were verified using CSI Bridge software.","PeriodicalId":43279,"journal":{"name":"Bridge Structures","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3233/BRS-210187","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69853978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Editorial 编辑

IF 0.6

Bridge Structures Pub Date : 2020-07-09 DOI: 10.3233/brs-200172

K. Mahmoud

引用次数: 0

Fatigue performance of singular and modular press-brake-formed steel tub girders 单模压制动型钢桶形梁的疲劳性能

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Bridge Structures Pub Date : 2020-01-01 DOI: 10.3233/brs-200168

K. Barth, G. Michaelson, Robert M. Tennant

引用次数: 1

Investigating the effect of span-length and earthquake directivity on the response of multi-span continuous girder bridges isolated by friction bearings 研究了跨长和地震指向性对隔震多跨连续梁桥反应的影响

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Bridge Structures Pub Date : 2020-01-01 DOI: 10.3233/brs-200169

A. Vatanshenas, M. S. Rohanimanesh

引用次数: 4