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Control Of Construction Stresses In Launched Bridges

Hector Blair

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Construction Of A Launched Bridge Control Of Construction Stresses In Launched Bridges Launched bridges are an increasingly popular bridge type due to their efficiency, long spans, and aesthetic appeal. However, the construction of launched bridges can induce significant stresses in the structure, which must be properly managed to ensure the bridge's safety and performance. This article provides a comprehensive guide to the control of construction stresses in launched bridges, covering the following topics:

Understanding Construction Stresses

Diagram Of Construction Stresses In A Launched Bridge Control Of Construction Stresses In Launched Bridges During construction, launched bridges are subjected to various types of stresses, including:

Control of Construction Stresses in Launched Bridges

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Dead loads: The weight of the bridge itself, including the superstructure, substructure, and any construction equipment
Live loads: Traffic and other moving loads that act on the bridge during operation
Construction loads: Loads imposed during construction, such as the weight of formwork, scaffolding, and construction equipment
Thermal stresses: Stresses caused by temperature changes during construction
Creep and shrinkage stresses: Stresses caused by the long-term deformation of concrete

Methods for Controlling Construction Stresses

Stress Control Techniques For Launched Bridges Control Of Construction Stresses In Launched Bridges The control of construction stresses in launched bridges involves various techniques, including:

Structural design: The bridge's structural design should be optimized to minimize stresses and ensure the safety and performance of the bridge
Construction sequencing: The sequence of construction operations should be carefully planned to minimize the accumulation of stresses
Stress monitoring: Sensors can be installed to monitor stresses in the bridge during construction and provide early warning of potential problems
Temporary supports: Temporary supports can be used to support the bridge during construction and reduce stresses
Pre-stressing: Pre-stressing techniques can be used to introduce compressive stresses in the bridge, which can offset tensile stresses caused by construction loads
Post-tensioning: Post-tensioning techniques can be used to introduce tensile stresses in the bridge after construction, which can counteract creep and shrinkage stresses

Case Studies

Case Study Of A Launched Bridge Control Of Construction Stresses In Launched Bridges The following case studies illustrate successful applications of construction stress control techniques in launched bridges:

Sidu River Bridge, China: This bridge was constructed using a cantilever launching method, and temporary supports were used to minimize stresses during construction
Sutong Bridge, China: This bridge was constructed using a segmental launching method, and pre-stressing and post-tensioning techniques were used to control stresses
Akashi Kaikyo Bridge, Japan: This bridge was constructed using a cantilever launching method, and a sophisticated stress monitoring system was used to ensure the safety of the bridge

The control of construction stresses in launched bridges is a critical aspect of bridge engineering, ensuring the safety and performance of the bridge. By understanding the different types of stresses, implementing effective stress control techniques, and learning from successful case studies, engineers can successfully design and construct launched bridges that are both efficient and durable.

Control of Construction Stresses in Launched Bridges

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