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CHAPTER 4: THE CONSTRUCTION PROCESS OF SEGMENTAL BRIDGES - page 40 / 47

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Chapter 4: The Construction Process of Segmental Bridges

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Table 4-4: Causes for Cantilever Imbalance

Cause for Imbalance Non-coincident work progress Construction inaccuracies Site temporary loads Wind loads Construction accidents

Example Concreting or segment placement faster on one side Weight difference between cantilever arms Material stored on cantilever arm Gales attacking the structure at an angle Falling of concreting or placement equipment

Figure 4-10 illustrates some of the aforementioned causes for cantilever imbalance during construction.

Temporary Loads

Form Travelers

Segment Imbalance

Wind

Figure 4-10: Causes for Cantilever Imbalance

Falsework has characteristics very different from the previously presented erection methods. It provides the structure that is erected on it with approximately continuous elastic support. The deflection of the formwork and falsework itself as well as settlements of soil on which it is founded need to be considered in stress and deflection calculation. The superstructure camber needs to be adjusted accordingly.

4.3.3 Existing Codes and Regulations

A variety of codes and regulations have to be taken into account when designing a bridge. The following paragraphs give an overview of these codes and regulations.

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