Development of Cost-Effective Box Girder Bridge Design and Accelerated Construction in Skew and Straight Alignments

开发具有成本效益的箱梁桥设计和斜线和直线加速施工

• 批准号: RGPIN-2019-06842
• 负责人: Sennah, Khaled
• 金额: $ 2.62万
• 依托单位: Ryerson University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=716294
• 关键词: Development; Cost; Effective; Box; Girder

The use of prefabricated elements and systems in accelerating bridge construction has recently been the subject of much attention and interest amongst bridge jurisdictions. Prefabricated elements and systems can be quickly assembled, reduce the impact on the environment in the vicinity of the site, and minimize the delays and lane closure time and inconvenience to the traveling public, saving time and tax payers' money. One of these systems is the full-depth, full width, precast concrete deck slab placed transversally over box girders where grouted pockets are provided to accommodate clusters of shear connectors welded to steel girders or embedded in concrete girders. The Canadian Highway Bridge Design Code, CHBDC does not provide enough guidance or specifications for the economical design of such prefabricated bridge system made of box section in skew and right alignments. Literature review revealed a number of important unresolved analysis, design and performance issues which require detailed evaluation and form the short term objectives of this research. These issues include: (i) dead and live load distribution coefficients for box girder bridges in skew alignment at construction stage; (ii) live load distribution coefficients for composite box girder bridges in straight and skew alignment at ultimate and fatigue limit states; (iii) capacity of steel stud clusters at ultimate and fatigue limit states as opposed to single stud applications, incorporating ultra-high performance concrete (UHPC) as filling material in shear pockets; (iv) capacity of steel channel connectors at ultimate and fatigue limit states and (v) ultimate and fatigue capacities of precast panel-to-panel connection in the tension side over piers for strength and long-term durability, especially with the use of glass fiber reinforced polymer (GFRP) bars as slab main reinforcement at the negative moment region. The long term objectives of this research aim at contributing to the efficient design of such prefabricated box girder bridges by developing experimentally calibrated, computer based, analytical models capable of predicting accurately their response due to load conditions. The research will include numerical modelling using the finite-element method, the Orthotropic Plate Theory and experimental program. This study is expected to result in a more economical prefabricated bridge design process, with potentially significant cost savings to bridge owners. The proposed research program will foster interaction with the industry that will benefit the bridge engineering profession. In the long term, more reliable and economical expressions and methodology for design of such prefabricated bridge system will be generated for possible inclusion in the Canadian Highway Bridge Design Code as the applicant did for its forthcoming 2019 edition based on his current NSERC Discovery and Engage Grants and additional funding from the industry.

使用预制构件和系统来加速桥梁建设最近已成为桥梁管辖区广泛关注和兴趣的主题。预制构件和系统可以快速组装，减少对工地附近环境的影响，最大限度地减少延误和车道封闭时间以及给公众出行带来的不便，节省时间和纳税​​人的钱。其中一个系统是全深度、全宽度的预制混凝土板，横向放置在箱梁上，其中提供灌浆袋，以容纳焊接到钢梁或嵌入混凝土梁中的剪力连接器集群。加拿大公路桥梁设计规范 CHBDC 没有为这种由倾斜和右对齐的箱形截面制成的预制桥梁系统的经济设计提供足够的指导或规范。文献综述揭示了许多重要的未解决的分析、设计和性能问题，需要详细评估并形成本研究的短期目标。这些问题包括： (i) 斜交箱梁桥在施工阶段的静载和活载分配系数； (ii) 直线和斜交组合箱梁桥在极限和疲劳极限状态下的活载分布系数； (iii) 与单螺柱应用相比，钢螺柱簇在极限和疲劳极限状态下的承载能力，采用超高性能混凝土 (UHPC) 作为剪切袋中的填充材料； (iv) 钢槽连接器在极限和疲劳极限状态下的能力，以及 (v) 桥墩上方受拉侧的预制板对板连接的极限和疲劳能力，以确保强度和长期耐用性，特别是使用玻璃时纤维增强聚合物（GFRP）钢筋作为负弯矩区域的板主钢筋。 这项研究的长期目标旨在通过开发经过实验校准的、基于计算机的分析模型，能够准确预测其在荷载条件下的响应，从而为此类预制箱梁桥的高效设计做出贡献。该研究将包括使用有限元方法、正交异性板理论和实验程序进行数值建模。这项研究预计将带来更经济的预制桥梁设计过程，并可能为桥梁业主节省大量成本。拟议的研究计划将促进与行业的互动，这将有利于桥梁工程专业。从长远来看，这种预制桥梁系统的设计将产生更可靠、更经济的表达方式和方法，并有可能纳入《加拿大公路桥梁设计规范》，正如申请人根据其当前的 NSERC Discovery 和 Engage Grants 为即将发布的 2019 年版本所做的那样以及来自行业的额外资金。