Development of Cost-Effective Accelerated Bridge Construction in Skew and Right Alignments

开发具有成本效益的斜线和右线加速桥梁施工

• 批准号: RGPIN-2014-05275
• 负责人: Sennah, Khaled
• 金额: $ 1.75万
• 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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=664737
• 关键词: Development; Cost; Effective; Accelerated; Bridge

The use of prefabricated elements and systems in accelerating construction of new bridges and replacement of deteriorated ones has recently been the subject of much attention and interest amongst bridge jurisdictions. Prefabricated elements and systems can be quickly assembled and could reduce design efforts, 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 involve full-depth, full width, precast concrete deck slab placed transversally over steel or concrete girders where grout pockets are provided to accommodate clusters of shear connectors welded to steel girders or embedded in concrete girders. The Canadian Highway Bridge Design Code does not provide enough guidance or specifications for the economical design of such prefabricated bridge system in skew and right alignments. Literature review revealed a number of important unresolved analysis, design and performance issues which require detailed evaluation. These issues include: (i) the dead and live load distribution coefficients for non-composite bridges in skew alignment at construction stage during precast deck placement; (ii) live load distribution coefficients for composite bridges in skew alignment at ultimate serviceability and fatigue limit states; (iii) capacity of stud clusters at ultimate and fatigue limit states as opposed to single stud applications, incorporating ultra-high performance concrete (UHPC) in shear puckets; (iv) precast panel-to-panel connection within bridge span for strength and long-term durability (i.e. water leakage); (v) precast panel-to-panel connection, incorporating glass fibre polymer (GFRP) bars with headed ends and UHPC at the negative moment region to add to the strength of the composite girder at ultimate and fatigue limit states; (vi) follow-up field study on actual bridges to verify the finite-element computer modeling for truck load distribution and to observe interaction of the various system components under actual field conditions. **The aim of this research is to contribute to the efficient design of such prefabricated bridges by developing experimentally calibrated, computer based, analytical models capable of predicting accurately their response due to sequence of construction, truck load history and environmental conditions. The proposed research program for the next 5 years fosters interaction with the Ontario Ministry of Transportation that will provide data on bridges built in Ontario with full-depth, full-width, deck panels and facilitate field testing. 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. This study is expected to result in a more economical prefabricated bridge design process, with potentially significant cost savings to bridge owners. Field data and full-scale experimental results will provide a meaningful feedback to bridge designers, leading to a new generation of minimal maintenance bridges, detailed for inherent durability.

使用预制构件和系统来加速新桥梁的建设和更换老化桥梁最近已成为桥梁管辖区广泛关注和感兴趣的主题。预制构件和系统可以快速组装，可以减少设计工作，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对公众出行的不便，节省时间和纳税​​人的钱。其中一个系统涉及全深度、全宽度的预制混凝土桥面板，横向放置在钢梁或混凝土梁上，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没有为这种倾斜和右对齐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。这些问题包括：（i）在预制桥面放置施工阶段斜对中非复合材料桥梁的静荷载和活荷载分配系数； (ii) 斜交组合桥梁在最终使用性能和疲劳极限状态下的活载分布系数； (iii) 与单螺柱应用相比，螺柱簇在极限和疲劳极限状态下的能力，将超高性能混凝土 (UHPC) 纳入剪力桶中； (iv) 桥跨内的预制板与板之间的连接，以确保强度和长期耐用性（即漏水）； (v) 预制板与板之间的连接，在负弯矩区域结合有头端的玻璃纤维聚合物 (GFRP) 杆和 UHPC，以增加复合材料梁在极限和疲劳极限状态下的强度； (vi) 对实际桥梁进行后续现场研究，以验证卡车负载分布的有限元计算机模型，并观察实际现场条件下各个系统组件的相互作用。 **这项研究的目的是通过开发经过实验校准的、基于计算机的分析模型，能够准确预测其由于施工顺序、卡车负载历史和环境条件而产生的响应，从而为此类预制桥梁的高效设计做出贡献。拟议的未来 5 年研究计划将促进与安大略省交通部的互动，该部将提供安大略省建造的全深度、全宽度、桥面板的桥梁的数据，并促进现场测试。从长远来看，将产生更可靠、更经济的预制桥梁系统设计表达式和方法，并有可能纳入加拿大公路桥梁设计规范中。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。 现场数据和全面的实验结果将为桥梁设计者提供有意义的反馈，从而产生新一代的最小维护桥梁，并详细说明了固有的耐用性。