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Tag Archives: Forces

The Structural Significance of Solid Backing: Part 1

Solid backing is actually a major structural component of a stone arch bridge which uses it. One of its advantages is that it provides a more consistent stiffness behind the arch.

Posted byStoneArchBridgesJanuary 27, 2023January 27, 2023Posted inConstructionTags:Design, Forces, Quality of Construction

Repairing Fill-Related Problems

Front Circle Crack

Fill-related problems in a stone arch bridge take on several forms, but often result in bulging, sliding, and failure of bridge components. These problems can be addressed.

Posted byStoneArchBridgesDecember 2, 2022December 10, 2022Posted inMaintenanceTags:Fill, Forces, Quality of Construction

The Strength of a Mortarless Stone Bridge

Mortarless Stone Bridge

A mortarless stone arch bridge can be quite strong, as the secret to a successful stone bridge is to keep all the forces in compression as opposed to “gluing” the stones with mortar.

Posted byStoneArchBridgesOctober 7, 2022October 7, 2022Posted inConstructionTags:Design, Forces, Quality of Construction

Using Feathers and Wedges to Split Stone

Splitting Stone(3)

Feathers and wedges are simple-to-use and reliable tools that provide an easy means for obtaining reasonable slabs out of massive, irregularly shaped stones.

Posted byStoneArchBridgesSeptember 16, 2022September 17, 2022Posted inConstructionTags:Forces, Stones

Hidden Structural Features

Detail of Walz Ford Bridge Arch

Many stone arch bridge feature subtle design features that are tucked away out of sight within the structure, which can greatly complicate rehab and load handling calculations.

Posted byStoneArchBridgesJuly 22, 2022July 23, 2022Posted inMaintenanceTags:Design, Forces, Quality of Construction, Stones

The Importance of Friction

Stone Arch Bridge

Friction is a crucial factor in stone arch bridge stability, and, when the line of thrust is solidly within the arch, holds the arch stones firmly in place.

Posted byStoneArchBridgesJune 10, 2022June 11, 2022Posted inConstructionTags:Design, Forces, Stones

When Walls Bulge

Double Arch Bridge

Bulging walls in the approaches and spandrel walls of a stone arch bridge indicate excessive force against them. This type of problem is fairly simply addressed.

Posted byStoneArchBridgesApril 22, 2022April 23, 2022Posted inMaintenanceTags:Design, Forces, Quality of Construction

Understanding Longitudinal Cracks in Arches

Deteriorated Stonework

Longitudinal cracking is a common defect on stone arch bridges. While often not overly serious, under the right conditions this cracking can indicate a major problem.

Posted byStoneArchBridgesMarch 11, 2022March 14, 2022Posted inMaintenanceTags:Forces, Spandrel Walls, Stones

Lighter Stone Bridges

Pontypridd Bridge

Stone bridges are inherently quite heavy. This can sometimes cause foundational or arch problems, prompting designers to come up with ingenious solutions.

Posted byStoneArchBridgesFebruary 25, 2022February 26, 2022Posted inConstructionTags:Design, Forces

Tapered Arches

Stone Bridge of Granite

Building an arch that is tapered by making the haunches thicker than the crown is a clever way to make a strong bridge without increasing the “hump.”

Posted byStoneArchBridgesSeptember 24, 2021October 28, 2021Posted inConstructionTags:Design, Forces

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