A tied-arch bridge combines features of an arch bridge and a suspension bridge. It uses horizontal thrust from both sides to support an arched structure, as in a regular arch bridge. But instead of an arch supporting the structure from below, the arch rises above the road, and vertical ties descend to increase support of the decking.

These are also called bowstring bridges since they look like a bow from the side. This bow uses the tension of its vertical cables, together with the compression of the arch, to support the load and keep the bridge stable.

Tied arch bridges with a good choice and arrangements of hangers show a solution for appearance and structural stability. The maximum axial force and maximum force variation in the hangers, the maximum bending moment and moment variation in the arch and the tie are strongly influence the hanger arrangement.The most compact choice is to use either rope, spiral strand or locked coil strand. If one hanger breaks accidentally the adjacent hangers are capable to work under high-stress levels. So hangers should strong enough to carry extreme loads.

Different types of hanger arrangement are the followings:

• Vertical arrangement.
• Fan arrangement.
• Network arrangement with inclined hangers having multiple intersections.

In one hand Vertical and fan arrangement are better than network arrangement if fatigue is considered as the only parameter. But in other hand network arrangement is globally accepted if bending moment in arch and tie and the values of axial forces in hangers are considered.

Advantages of Tied arch bridges

* Variety of materials used for the construction of Tied Arch Bridges such as concrete, steel etc. so it’s very resistant to failure.

* Extremely strong, because the arch design allows the forces to the deck goes to arches via hangers which means no part of the bridge takes on the high amount of pressure. The half-circle design prevents any changes in the bride due to bending.

* They are very resistant so that the force due to moving transports the loads pass to the arches and equally distributed to both ends and that makes the force pressing action less in the middle on the bridge. This had made the bridge stronger than other traditional bridges.

They became stronger, this is because since the arch bridges are built to compress, they actually become stronger with more visit on them.

About Us

We always use high-quality structure steel in certified grades for bridge fabrication. Prefabrication of steelwork in our highly controlled factory conditions leads to high quality work at minimum cost. The excellent quality control is achieved through a thorough testing regime at the steel mills and during the fabrication processes of cutting and drilling, assembly, welding, and protective treatment. The quality assurance that is attained should give confidence to all clients and engineers who specify steel for their bridge project.

We will use Corten Steel for most type of bridges. Corten steel is a high strength low alloy steel that in suitable environments forms an adherent protective rust ‘patina’, to inhibit further corrosion. The corrosion rate is so low that bridges fabricated from unpainted weathering steel can achieve a 120 year design life with only nominal maintenance.

Why Us
1.Highest national qualification–Grade I Professional Engineering Contractor for Steel Structure

2. Able to undertake all kinds of steel structure projects

3. Obtained EU certification, AWS Qualification
4. Experienced in overseas projects

5. 36000㎡ workshop, senior engineer team, highly trained workers to ensure on-time delivery.

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