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Computational Assessment of Prestressed Concrete Bridges

机译：预应力混凝土桥梁的计算评估

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A current challenge for engineers is the conservation of existing structures which includesrnmaintenance, assessment and, if necessary, strengthening. For the evaluation of the load carryingrncapacity and the remaining service life, detailed knowledge of material properties is required and arnstructural model should be used, with which the stress state can reliably be analysed. In this paper,rnconcrete hollow box girder bridges (single and multi-cell cross sections) are examined.rnFirst, on the basis of a case study it is shown how eccentrically arranged traffic loads are introducedrninto the system. For this, a 3d finite element model with the assumption of linear elastic materialrnbehaviour is used. The results are compared to those of a beam based calculation where, regardingrnthe shear forces, considerable differences are found.rnSecond, the influence of the reduction of the stiffness due to cracking of the concrete is discussed.rnFinally, the effect of the decrease of prestress as a result of damaged coupling joints is outlined.
机译：工程师当前面临的挑战是对现有结构的保护，包括维护，评估和必要时进行加固。为了评估承载能力和剩余使用寿命，需要对材料特性有详细的了解，并应使用结构模型来可靠地分析应力状态。本文对混凝土空心箱梁桥（单截面和多单元截面）进行了研究。首先，在案例研究的基础上，说明了如何将偏心布置的交通荷载引入系统。为此，使用具有线性弹性材料行为的3d有限元模型。将结果与基于梁的计算结果进行比较，在梁的计算中，关于剪切力，发现了相当大的差异。第二，讨论了由于混凝土开裂而导致的刚度降低的影响。最后，降低了预应力的影响概述了由于联轴节损坏引起的情况。

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