Integral abutment bridges(IABs) are jointless bridges where the girder or the deck is continuous and connected monolithically to the abutments.A usual and important problem in the design of IABs is how to deal with th...Integral abutment bridges(IABs) are jointless bridges where the girder or the deck is continuous and connected monolithically to the abutments.A usual and important problem in the design of IABs is how to deal with the soil-structure interaction behind the abutments and next to the foundation piles: this can be considered as a fundamental aspect for the thorough understanding of this type of structures,which requires iterative and nonlinear analysis.In this paper,a 2D simplified finite-element model of a real 400 meters long IAB,built in the Province of Verona-Italy,is implemented and used to perform non linear analysis on the bridge,whose superstructure response is examined in details in the present paper.Then,the results obtained from a parametric study on the IAB,where the soil properties are varied behind the backwall and adjacent to the piles are varied,are described.In the end,a pushover analysis is carried out to assess the failure pattern of the bridge due to temperature change,considered as one of the key parameters in IABs design;finally,the effect of abutment stiffness is also discussed.The case study presented represents the world record for this kind of bridges.Authors believe this can be a cost effective and an efficient strategy to improve the durability and extend the life span of commonly built simply supported flyovers prone to maintenance problems due to bearings and expansion joints durability.展开更多
为了克服桥梁伸缩缝病害,考虑了桥梁上部结构、下部结构和基地土的共同作用,建立了半整体式桥台无伸缩缝桥的静力计算模型。以一座长100 m PC连续箱梁桥为例,对该桥在重力、车辆和季节性温度变化荷载作用下进行了弹性大变形分析,对相应...为了克服桥梁伸缩缝病害,考虑了桥梁上部结构、下部结构和基地土的共同作用,建立了半整体式桥台无伸缩缝桥的静力计算模型。以一座长100 m PC连续箱梁桥为例,对该桥在重力、车辆和季节性温度变化荷载作用下进行了弹性大变形分析,对相应的有伸缩缝桥和整体式桥台无伸缩缝桥分析结果进行了对比。结果表明:半整体式桥台无伸缩缝桥主梁的弯矩、剪力、挠度和下部结构的轴力与有伸缩缝桥接近,但主梁中出现了轴力,下部结构弯矩和剪力较有伸缩缝桥大,说明半整体式桥台无伸缩缝桥消除了伸缩缝的病害,结构整体刚度大,是一种有应用推广价值的桥型。展开更多
文摘Integral abutment bridges(IABs) are jointless bridges where the girder or the deck is continuous and connected monolithically to the abutments.A usual and important problem in the design of IABs is how to deal with the soil-structure interaction behind the abutments and next to the foundation piles: this can be considered as a fundamental aspect for the thorough understanding of this type of structures,which requires iterative and nonlinear analysis.In this paper,a 2D simplified finite-element model of a real 400 meters long IAB,built in the Province of Verona-Italy,is implemented and used to perform non linear analysis on the bridge,whose superstructure response is examined in details in the present paper.Then,the results obtained from a parametric study on the IAB,where the soil properties are varied behind the backwall and adjacent to the piles are varied,are described.In the end,a pushover analysis is carried out to assess the failure pattern of the bridge due to temperature change,considered as one of the key parameters in IABs design;finally,the effect of abutment stiffness is also discussed.The case study presented represents the world record for this kind of bridges.Authors believe this can be a cost effective and an efficient strategy to improve the durability and extend the life span of commonly built simply supported flyovers prone to maintenance problems due to bearings and expansion joints durability.
文摘为了克服桥梁伸缩缝病害,考虑了桥梁上部结构、下部结构和基地土的共同作用,建立了半整体式桥台无伸缩缝桥的静力计算模型。以一座长100 m PC连续箱梁桥为例,对该桥在重力、车辆和季节性温度变化荷载作用下进行了弹性大变形分析,对相应的有伸缩缝桥和整体式桥台无伸缩缝桥分析结果进行了对比。结果表明:半整体式桥台无伸缩缝桥主梁的弯矩、剪力、挠度和下部结构的轴力与有伸缩缝桥接近,但主梁中出现了轴力,下部结构弯矩和剪力较有伸缩缝桥大,说明半整体式桥台无伸缩缝桥消除了伸缩缝的病害,结构整体刚度大,是一种有应用推广价值的桥型。
