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首页> 外文会议>Proceedings of the Thirteenth international conference on civil, structural and environmental engineering computing >The Effect of Partial Fixity of the Bearings on the Structural Behaviour of Bridges
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The Effect of Partial Fixity of the Bearings on the Structural Behaviour of Bridges

机译：轴承部分固定对桥梁结构性能的影响

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Bridges are not static structures, they are continually in motion. Temperaturernchanges, imbalances in dead loads, moving of vehicles or trains and other types ofrndynamic loads cause linear and rotational movements to take place in bridgernelements. To allow for these movements to occur, a bridge has bearing devicesrnwhich transmit loads from the superstructure to the substructures. Defects andrnproblems of bridge bearings result restriction of their movements and partially fixityrnof their rotations. Once these movements and/or rotations are restricted or prevented,rna build up of forces will cause undesirable movements and generate harmful stressesrnin different bridge elements. These detrimental stresses must be quantified andrnstudied. The aim of this work is to study the effect of partial fixity of bearings on thernstructural behaviour of bridges. Finite element method is used to perform the desiredrnanalysis. Three actual studied cases represent the most common types of roadwayrnbridges are analyzed and investigated. The first study case is a composite steelconcreternbridge; the second is a reinforced concrete while the third is a pre-castrnconcrete bridge. The analysis for each study-case is done for statical systemsrnrepresent different degrees of partial fixity of bearing rotations and complete lockingrnof its movements. Also, the analysis is performed for both the bridge own weightrnand 25o C uniform rise in temperature of bridge superstructure. The obtained resultsrnare studied versus the analysis results of the statical system considered in the design.rnThe study indicates that partial fixity of bearings generates significant stresses - notrnconsidered in the design - in different bridge elements. Hence, a great attention mustrnbe towards the maintenance, repairing and replacement of the bridge bearings.
机译：桥梁不是静态结构，它们不断运动。温度变化，静载荷不平衡，车辆或火车的移动以及其他类型的动载荷会导致桥梁元件发生线性和旋转运动。为了使这些运动发生，桥梁具有支承装置，其将载荷从上部结构传递到下部结构。桥梁轴承的缺陷和问题会限制其运动并部分固定其旋转。一旦这些运动和/或旋转受到限制或阻止，力的累积将导致不期望的运动并在不同的桥元件中产生有害的应力。必须对这些有害应力进行量化和研究。这项工作的目的是研究轴承的部分固定对桥梁结构行为的影响。使用有限元方法进行所需的分析。对三个实际研究案例进行了分析和研究，它们代表了最常见的道路桥梁类型。第一个研究案例是复合钢混凝土桥。第二座是钢筋混凝土，第三座是预制混凝土桥梁。对每个研究案例的分析都是针对静态系统进行的，静态系统代表轴承旋转的不同程度的部分固定，并对其运动进行完全锁定。同样，对桥梁自重和桥梁上部结构温度均匀升高25o C进行分析。将获得的结果与设计中考虑的静态系统的分析结果进行了比较。研究表明，轴承的部分固定会在不同的桥梁构件中产生很大的应力（设计中未考虑）。因此，必须特别注意桥梁轴承的维护，修理和更换。

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