Tied Arch Bridge

Structural Components

Arch Rib: As the main load-bearing structure, it bears vertical loads and transfers them to the piers. It is generally constructed using reinforced concrete or steel. Its cross-sectional forms include rectangular, I-shaped, or box-shaped. For small spans, rectangular cross-sections are mostly used; for large spans, I-shaped or box-shaped cross-sections are more effective in enhancing flexural rigidity.

Tie Rod: A key component connecting the arch rib and the bridge deck. Through prestressing or post-tensioning, it provides horizontal support for the bridge deck, bears the horizontal tension at the arch feet, and forms a stable force-bearing system together with the arch rib. Its cross-sectional forms include section steel, flat steel, reinforced concrete, and prestressed reinforced concrete. Rigid tie rods are generally designed with box-shaped or I-shaped cross-sections.

Hanger Rod: Typically a slender component that acts as an axially loaded member, only bearing tension. It is used to connect the arch rib and the tie rod for load transfer. In the past, reinforced concrete or prestressed concrete components were mostly used; now, high-strength steel wire bundles or thick steel bars are commonly adopted.

Bridge Deck System: Responsible for directly bearing traffic loads and transferring these loads to the arch ribs and tie rods.

Structural Characteristics

Reasonable Force Bearing: It gives full play to the structural performance and combined effect of beams (bearing bending) and arches (bearing compression). The horizontal thrust at the arch ends is borne by the tie rods, so no horizontal thrust is generated at the arch end supports, and there is no impact on the uneven settlement of piers and abutments.

Large Span Capacity: It combines the large span capacity of arch bridges and the strong adaptability of beam bridges to the foundation. It is a superior bridge type when the bridge deck elevation is limited, the required under-bridge clearance is high, or the geological conditions of pier and abutment foundations are poor.

Aesthetic Appearance: The curved shape of the arch rib is elegant and can integrate with the urban landscape, making it suitable for urban river-crossing bridges or interchange hubs.

Main Types

Simply Supported Beam-Arch Composite Bridge: Only used as a through-type bridge, all of which are thrust-free composite system arches. The external structure is statically determinate, while the internal structure is a hyperstatic structure. In addition to the arch ribs, the main load-bearing components also include stiffening longitudinal beams. According to the relative stiffness of the arch ribs and tie rods, it can be divided into three types: flexible tie rod with rigid arch, rigid tie rod with flexible arch, and rigid tie rod with rigid arch.

Continuous Beam-Arch Composite Bridge: It can be deck-type, half-through-type, or through-type, and can also be a combination of multi-rib arch, double-rib arch, or single-rib arch with stiffening beams. It has high rigidity, large span capacity, and an aesthetic appearance.

Single Cantilever Composite Bridge: Only suitable for deck-type bridges, and is particularly convenient for rotation construction. The stiffening beam bears tension and bending, and the arch ribs are made of reinforced concrete.

Application Fields

Bridge Engineering: It is widely used in bridge construction at home and abroad. For example, a large tied arch bridge in Guangdong Province spans a river of hundreds of meters, and a winter-passable bridge in Heilongjiang Province can bear ice-snow loads and vehicle loads.

Other Buildings: It can also be applied to the roof structures of gymnasiums, exhibition halls, railway stations, airports, etc., to provide large-span indoor spaces.

Strong Qualifications: It holds 20 high-level qualifications including top-tier steel structure manufacturing, steel bridge manufacturing, and other premium certifications. Certified by multiple management systems, its comprehensive strength ranks among the top 50 in China's steel structure industry.

Powerful Technology: As a national high-tech enterprise, it owns nearly 100 patents and conducts industry-university-research cooperation with multiple universities. It has built a "National 5G Factory" and realizes full-process intelligent management and control through industrial internet and AI large models, increasing production efficiency by 26%.

Superior Quality: It has established a strict quality control system. Equipped with intelligent production lines, its product qualification rate reaches 99.98%. It has participated in the construction of landmark projects such as Beijing Daxing International Airport and won many honors including the China Steel Structure Gold Award.

Comprehensive Services: It provides one-stop services from design and manufacturing to construction and operation & maintenance, and supports customized needs. Its business covers domestic and foreign markets, with an overseas market share of nearly 11%, gaining international recognition.

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