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Three Year Evaluation of Thermally Induced Strain and Corresponding Lateral End Pressures for a GRS IBS in Ohio

机译：俄亥俄州GRS IBS的热致应变和相应的侧向端压力的三年评估

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摘要

Geosynthetic-Reinforced Soil (GRS) Integrated Bridge Systems (IBS) integrate conventional bridge superstructures with a GRS abutment foundation and GRS approach for a cost effective, rapid construction alternative. A 42.7 m long single span GRS IBS was constructed and instrumented to monitor the thermally induced behaviors and better understand the interaction between the superstructure and substructure within the limits of this system. Strain gages were attached to the steel girders and lateral end pressures were monitored using earth pressure cells to determine the level of stress thermally induced in the GRS approach over a 3.5 year monitoring period and evaluate the rigidity of the boundary conditions that exist at the interface. During this 3.5 year monitoring period, the data show that the GRS approach is engaged with the superstructure, and experiences both active and passive lateral pressures during each thermal cycle without displaying an increase in passive pressure with time. The stress-strain data acquired during this project indicate that the GRS IBS is behaving significantly more like a system with unrestrained boundaries due to the flexibility of the GRS approach at each end. The tightly spaced reinforcements create a composite material at the ends of the superstructure that enable the approach fill to move successfully with thermally induced superstructure deformations without creating a failure within the soil or at the surface of the roadway (interface included).
机译：土工合成材料加筋（GRS）集成桥梁系统（IBS）将常规的桥梁上部结构与GRS桥台基础和GRS方法相结合，从而提供了经济高效的快速施工替代方案。建造了一个42.7 m长的单跨GRS IBS，并对其进行了测量，以监测热诱导行为，并更好地了解该系统范围内上部结构与下部结构之间的相互作用。将应变计连接到钢梁上，并使用土压力传感器监测侧向端压力，以确定在3.5年的监测期内GRS进近过程中产生的热应力水平，并评估界面处存在的边界条件的刚度。在这个为期3.5年的监测期内，数据显示GRS方法与上部结构接合，并且在每个热循环中都经历了主动和被动侧向压力，而没有显示被动压力随时间增加。在此项目中获取的应力应变数据表明，由于GRS方法在每一端的灵活性，GRS IBS的行为明显更类似于边界不受限制的系统。紧密间隔的钢筋在上层建筑的端部形成了一种复合材料，使进场填土能够在热引起的上层建筑变形的情况下成功移动，而不会在土壤内部或巷道表面（包括界面）造成破坏。

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