Case studies considering the influence of the time-dependent behaviour of concrete on the serviceability limit state design of composite steel-concrete bridges

Alejandro Pérez Caldentey, L. Dezi, Javier Jordán, G. Leoni, G. Ranzi, R. Gilbert
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Abstract

This chapter introduces three case studies that describe how aspects related to the serviceability limit state design associated with the time-dependent behaviour of concrete can be considered in a design situation. The first case study considers the Oxec II Bridge in Guatemala. It provides an overview of the stress verification of the steel section of the composite bridge and accounts for concrete time effects to capture the stress redistribution that occurs between the concrete and the steel components. The second case study deals with the Yalquincha Viaduct in Chile and provides an overview of the type of long-term analyses that can be carried out when considering the influence of different cross-sectional arrangements on the time-dependent response of the bridge. The last case study focusses on the Serra Cazzola Viaduct in Italy and highlights the opportunities available to designers in exploiting optimised casting sequences to reduce the time-dependent stresses induced in the concrete and, therefore, mitigate the likelihood of concrete cracking.
考虑混凝土时效特性对钢-混凝土组合桥梁使用极限状态设计影响的实例研究
本章介绍了三个案例研究,描述了如何在设计情况下考虑与混凝土随时间变化的行为相关的可用性极限状态设计。第一个案例研究考虑了危地马拉的Oxec II桥。它概述了复合桥梁钢截面的应力验证,并考虑了混凝土时间效应,以捕捉混凝土和钢构件之间发生的应力重新分布。第二个案例研究涉及智利的Yalquincha高架桥,并概述了在考虑不同截面布置对桥梁随时间响应的影响时可以进行的长期分析类型。最后一个案例研究集中在意大利的Serra Cazzola高架桥上,并强调了设计师利用优化浇筑序列来减少混凝土中引起的时间依赖性应力的机会,从而减少混凝土开裂的可能性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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