Bridge towers are vertical concrete or steel structures that extend above the decks of bridges. It’s utilised to build suspension bridges, cable stayed bridges, and hybrid suspension cable stayed structures.The conceptual design of suspension and cable-stayed bridge towers, as well as their functions, are addressed in this article. Functions and Conceptual Design of Suspension Towers and Cable-Stayed Bridges The following subjects will be discussed: The tower of a cable suspension bridge or a cable stayed bridge serves a specific purpose. Towers’ conceptual design Towers are built with a variety of materials. Towers come in a variety of shapes and sizes. The construction of towers The Tower of a Cable Suspension Bridge or a Cable Stayed Bridge serves a variety of purposes. The major purpose of towers on cable-stayed or suspension bridges is to keep people safe.
Conceptual Design of Bridge Towers
The most important step of the design of a newly constructed bridge, and in this instance the towers, is conceptual design, which will serve as the foundation for the final design. This is because the structure’s dependability, serviceability, visual attractiveness, and cost are all determined during this process. Because it cannot be replaced, tower conceptual design may be more important than other bridge components in terms of supporting bridge and traffic loads and transferring them to the foundation, as well as determining bridge theme and character. Because it can be viewed from all directions, it will be the last image that the tourist remembers.The fundamentals and focus of conceptual design for towers and bridge structures in general should achieve four critical conditions.
As a result, towers must be dependable, serviceable, attractive, and cost-effective. The towers should be built simply and with the least amount of upkeep as possible. In the next parts, the conceptual design of tower bridges will be examined, with emphasis on three primary aspects of this bridge component: materials used, tower shape and form, and tower construction.Towers are built with a variety of materials. Steel, reinforced concrete, and timer are the three primary types of materials that could be used in tower building. The first two materials can be used to construct towers for long-span cable-stayed and suspension bridges, whereas the third material is only suitable for pedestrian bridges.
Steel Tower for Bridge
The type of material to be utilised for tower building should be determined during the conceptual design stage, and numerous criteria should be taken into account. For example, at the conceptual design stage, the building budget for each material should be nearly computed and compared. Different factors influence the cost of each material, including equipment availability, market conditions, contractor experience, design specifications, and project site conditions. If the life cycle cost is supposed to be a deciding element, the cost of maintenance and the frequency with which it is required should be addressed. As a result, the combined effect of the aforementioned factors would designate a cost-effective material.
Steel towers have a lower weight than reinforced concrete towers, resulting in a lower load on the foundation and, as a result, a lower foundation cost. Steel towers are not only more ductile and flexible, but they also take less time to erect. Steel towers must, however, have their paint maintained on a regular basis. In the majority of cases, a concrete tower is designed and built as a hollow shaft to save money on concrete and reinforcements and reduce self-weight.concrete-tower-Bridgeti Gure shows a concrete tower bridge. Towers’ Forms and Shapes Towers come in a variety of shapes and sizes, which can be chosen during the conceptual design stage. In a cable-stayed bridge structure, the height of the towers is equal to 0.2 multiply major.
Suspension and Cable Stayed Bridges
It is made up of two vertical shaft towers that are offset above the roadway and are connected together by a horizontal strut to boost tower safety. This shape allows the cables to be connected to the girder in a vertical plane.Offset Above the Roadway of Two Vertical Shaft Towers : Two vertical form towers are connected by a horizontal strut, which increases the stability of the structure. Two shafts of cable-stayed bridges can be inclined inward toward each other to form a modified A-frame or inclined to bring the shaft tops together to form a full A-frame, modified diamond vertical tower, and the A-frame can be extended with a single vertical shaft forming a single vertical shaft forming a single vertical shaft forming a single vertical shaft forming a single vertical shaft forming a single vertical shaft forming a single vertical shaft forming a single vertical shaft forming.
When deep foundations are not required, multitower cable-stayed bridges with three or more towers sometimes provide cost advantages over ultralong-span double-tower cable-stayed bridges or suspension bridges. Internal towers of multitower cable-stayed bridges, on the other hand, are not attached to rigid supports or foundations, hence their stiffness is lower than the side towers. As a result, when imbalanced live loads are applied to one main span, the internal towers and main girder can experience excessive deformation and internal forces. As a result, fixing the internal towers’ low stiffness problem is critical for multitower cable-stayed bridges. A new style of three-tower cable-stayed bridge is proposed in this research.
Functions and Conceptual Design
Because the flanking towers contribute significantly more stiffness than the central tower, the proportion of the main span supported by flanking tower cables can be increased while the central tower’s span can be reduced. This can be accomplished by altering the design of the three fans, which were previously equal in size. As a result, this novel structure is known as a three-tower cable-stayed bridge with unequal-sized fans. The stiffness, internal forces, and cost of the new system were compared to the stiffness, internal forces, and cost of traditional three-tower cable-stayed bridges with identical fans, and it was discovered that the new system could be a good alternative to the traditional designs.
The main tower of a cable-stayed bridge with a polygonal line tower carries the majority of the axial force transferred by the stay cable, as well as the moment under certain unbalanced loads. The main tower of a polygonal line tower cable-stayed bridge has a bending corner where the axis of the main tower shifts, and the direction of massive axial force transmission changes. The mechanical properties of essential sections, including the main tower bending corner of the concrete polygonal line tower, were analysed using model test and finite element numerical comparison analysis in this study of a cable-stayed bridge with a single cable plane in Shenyang. The findings reveal a major stress concentration issue at the main tower’s bending corner.
The results demonstrate a significant stress concentration phenomenon at the main tower’s bending the corner, but only a tiny area of high stress. Because vertical tensile stress occurs in the stiffener at the bending corner, the stress concentration coefficient of the bending corner section lowers, and the stiffening plate removes the out-of-plane bending phenomenon of the tower wall at the middle span side. Based on these findings, the stiffening plate corner angle should be increased, and the configuration of the vertical main tensile steel bar and the surface anticracking steel mesh inside the stiffening plate should be appropriately strengthened.
cable-stayed bridge, bridge form in which the weight of the deck is supported.
“Towers” are usually defined as the vertical steel or concrete structures that project above the bridge deck to support both themselves and the bridge cables.
The difference lies in how the cables are connected to the towers. In suspension bridges, the cables ride freely across the towers.