SED 18 (ePDF) Time-Dependent Behaviour and Design of Composite Steel-Concrete Structures

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Steel-concrete composite structures are widely used throughout the world for buildings and bridges. A distinguishing feature of this form of construction is the combination of concrete and steel components to achieve enhanced structural performance. The time-dependent response of concrete and its influence on the service behaviour and design of composite structures are the main focus of this SED. For the first time, a publication combines a state-of-the-art review of the research with the available design specifications of Europe, Australia and New Zealand, and USA. This publication intends to enhance the awareness of the service response of composite structures and of the latest research and standards’ developments. It is aimed at designers and researchers alike.

The review of research available in open literature is provided and arranged according to structural typologies, i. e. slabs, beams, and columns. It serves as background information for current service design rules and provides insight into the most recent research advancements. The review of available design guidelines presents the similarities and differences of the recommended service design procedures influenced by concrete time effects. Selected case studies of building and bridge projects show possible design approaches and the rationale required when dealing with the time-dependent response and design of composite structures. The authors of this publication are design engineers and academics involved in the service design and research on the time-dependent response of composite structures.

 

eISBN: 978-3-85748-177-2 (PDF)


Description

Composite steel-concrete structures have been gaining popularity over the last decades throughout the world and are now widely used for building and bridge applications. This form of construction combines the advantages of the concrete and steel components to achieve enhanced structural performance.

This SED publication deals with the behaviour and design of composite structures relevant to a subset of the serviceability limit state requirements that is associated with the time-dependent behaviour of concrete caused by creep and shrinkage. Inadequate considerations for these structural aspects can lead to excessive deformations, displace- ments, and cracking. A state-of-the-art review is provided of the research carried out on the time-dependent response of composite structures and of the available service design specifications. European, Australian and New Zealand, and American design guidelines have been considered.

In the first part of the publication, the design framework recommended in the selected design specifications is outlined by providing an overview of the main service design requirements and by introducing the limit states of deflection and cracking that are significantly influenced by concrete time effects. An overview of the constitutive models commonly used to describe the time-dependent behaviour of the concrete is presented to provide the theoretical background and design models that are used throughout the book. Models considered range from the algebraic formulations, commonly recommended for routine design, to more sophisticated constitutive formulations suitable for advanced analysis.

The state-of-the-art review of research carried out over the last decades on the time-dependent behaviour of composite structures is reported in the central part of the book and it is arranged according to structural typologies, i.e. slabs, beams and columns. An extensive review of both experimental and modelling work related to concrete time effects, and how these affect the service response of composite members is provided.

The review of available design guidelines aims at presenting, in one publication, the similarities and differences of the recommended service design procedures influenced by concrete time effects. The comparison among design rules is organised in an objective manner to ensure that readers can form their own opinion. To support this process, the background information of these design rules is reported, when possible, in the preceding part on the state-of-the-art review of published research.

In the final part of the publication, selected case studies of buildings and bridges are provided to gain insight into the possible design approaches and rationale that are required when dealing with the time-dependent response of composite structures. The focus has been to discuss the key structural aspects of each case study that are significantly influenced by concrete time effects. Detailed calculations are outside of the scope of the book and have not been provided.