Probabilistic demand model and performance-based fragility estimates for RC column subject to vehicle collision
Probabilistic demand model and performance-based fragility estimates for RC column subject to vehicle collision
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DOI：
10.1016/j.engstruct.2014.05.017
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发表时间：
2014-09
影响因子：
5.5
通讯作者：
Hrishikesh Sharma;P. Gardoni;S. Hurlebaus
中科院分区：
文献类型：
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作者：
Hrishikesh Sharma;P. Gardoni;S. Hurlebaus
车辆碰撞是结构失效最可能的原因之一。基础设施、服务业、住房办公用房、配电设施快速增加和蔓延。机械和人类的相互作用也涉及双方的错误。因此，车辆与建筑物碰撞的次数多年来也有所增加。因此，车辆与结构的碰撞已成为一个关键问题，也是结构失效的主要原因之一。桥梁柱、建筑柱和电线杆通常由钢筋混凝土 (RC) 制成。因此，必须正确设计 RC 柱以考虑车辆冲击载荷。当前的桥梁规范 AASHTO-LRFD (2007) [1] 规定假设柱子受到车辆撞击时的剪力需求为恒定值。然而，施加在 RC 柱上的实际剪力需求通常大于 AASHTO-LRFD 预测，并且不是恒定值，而是取决于许多变量，包括车辆速度和质量。本文开发了一个框架，用于对受车辆影响的 RC 柱进行基于性能的分析和设计。提出了一种概率模型来准确估计车辆撞击下钢筋混凝土柱的动态剪力需求。此外，还开发了一个评估 RC 柱在车辆碰撞时的脆弱性的框架。所提出的框架利用了开发的概率需求模型。这项工作可用于开发桥梁系统的载荷和阻力系数，并有助于实现基于可靠性的设计目标。开发的模型可用于设计更安全的柱，并且该工作可以扩展到类似载荷条件下的其他结构。
Vehicle collision is one of the most likely causes of structural failure. The infrastructure facilities, service industry, housing and office spaces, power distribution facilities have increased and spread at a high pace. The mechanical and human interactions also involve errors from both sides. As such, the number of collision of vehicles with structures has also risen over the years. As a result, vehicle collision with structures has become a critical problem and one of the leading causes of structural failure. Bridge columns, building columns, and electric poles are often made of reinforced concrete (RC). Therefore, RC columns have to be properly designed accounting for vehicle impact loading. The current bridge code AASHTO-LRFD (2007) [1] provisions assume a constant value for the shear force demand on a column subject to vehicle impact. However, the actual shear force demand imposed on an RC column is typically larger than the AASHTO-LRFD prediction and is not a constant value but rather depends on a number of variables including the vehicle velocity and mass.This paper develops a framework for the performance-based analysis and design of RC columns subject to vehicle impact. A probabilistic model is proposed to accurately estimate the dynamic shear force demand on the RC columns subject to vehicle impact. In addition, a framework to estimate the fragility of the RC column subject to a vehicle collision is also developed. The proposed framework makes use of the developed probabilistic demand model. This work can be used to develop load and resistance factors for the bridge system and help achieve the goal of a reliability-based design. The developed model can be used to design safer columns and the work can be extended to other structures under similar loading conditions.