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Influence of abutment straight backwall fracture on the seismic response of bridges

机译：邻接直背碴骨折对桥梁地震反应的影响

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摘要

Field reconnaissance reports reveal the seismic vulnerability of bridge abutment foundations. To reduce the time and cost of postearthquake repair, modern seismic design specifications allow abutment backwalls to fracture before the supporting abutment foundations reach their maximum strength. This design strategy enables abutment backwalls to function as a fuse, thus protecting the abutment foundations from experiencing excessive forces and damage. This paper introduces a new abutment modeling scheme to capture the shear fracture mechanism of straight backwalls in seat abutments. To this end, a backwall connection spring is developed and incorporated into a spring system that simulates the behavior of various abutment components. The importance of considering the backwall fracture is examined by reviewing conventional modeling methodologies for abutments and building companion numerical models. Static pushover and incremental dynamic analyses (IDAs) were conducted for two bridges (single- and two-span) modeled by both the proposed and conventional abutment modeling schemes. Moreover, component-level fragility curves are developed using IDA results. The comparisons show that the conventional abutment modeling schemes significantly overestimate abutment foundation damage and underestimate the likelihood of deck unseating, column damage, and bearing displacement in the passive direction. Conversely, the proposed modeling scheme is able to capture the essential seismic responses of various components in seat abutment bridges. The consideration of backwall fracture in the modeling of abutment components enables a more rational seismic response assessment of bridges with backwalls, which are likely to be damaged during earthquakes, particularly for bridges which are seismically designed to protect abutment foundations.
机译：现场侦察报告揭示了桥梁基础的地震脆弱性。为了减少底震修复的时间和成本，现代地震设计规范允许支撑基础基础达到最大强度前截止基台骨折。这种设计策略使邻接反隔离件能够作为保险丝，从而保护基础基础经历过度的力量和损坏。本文介绍了一种新的基台建模方案，以捕获座椅中直背空间的剪切断裂机制。为此，开发了一个背墙连接弹簧并将其结合到模拟各种校准组件的行为的弹簧系统中。考虑反壁骨折的重要性通过审查用于基座和构建伴侣数值模型的常规建模方法来检查。对于由所提出的和传统的基台建模方案建模的两个桥（单跨和两跨度）进行了静电推进器和增量动态分析。此外，使用IDA结果开发了组分级脆性曲线。比较表明，传统的基台建模方案明显高估了基础损伤，低估了甲板未排销，柱损伤和轴承位移在被动方向上的可能性。相反，所提出的建模方案能够捕获座椅邻接桥中各种部件的基本地震反应。在邻接部件建模中考虑反弹骨折使得具有背壁的桥梁的更合理的地震反应评估，这可能在地震期间受损，特别是用于保护邻接基础的桥梁。

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