Abstract
The proposed paper compares tied-arch bridge alternatives and cable-stayed bridge alternatives based on needed load-bearing construction material amounts in the superstructure. The comparisons are prepared between four tied arch bridge solutions and four cable-stayed bridge solutions of the same span lengths. The sum of the span lengths is 300 m. The rise of arch as well as the height of pylon and cable arrangements follow optimal dimensions. The theoretic optimum rise of tied-arch for minimum material amount is higher than traditionally used for aesthetic reason. The optimum rise for minimum material amount parabolic arch is shown in the paper. The mathematical solution uses axial force index method presented in the paper. For the tied-arches the span-rise-ration of 3 is used. The hangers of the tied-arches are vertical-The tied-arches are calculated by numeric iteration method in order to get moment-less arch. The arches are designed as constant stress arch. The area and the weight of the cross section follow the compression force in the arch. In addition the self-weight of the suspender cables are included in the calculation. The influence of traffic loads are calculated by using a separate FEM program. It is concluded that tied-arch is a competitive alternative to cable-stayed bridge especially when asymmetric bridge spans are considered.
Highlights
Arch bridge is perhaps the best known bridge type
Arches can be classified in many ways like deck arch bridge, tied-arch bridge, through arch bridge, truss arch and most recently network arch
Many resent articles handle about network arches and especially their optimal suspender arrangements
Summary
Arch bridge is perhaps the best known bridge type. It came to use 2000 years ago [1]. The modern construction material is steel, often used as composite structure with concrete. Already in forties an article was published where the limit of 1000 m of concrete was found. Cable-stayed bridge has been a competitive bridge type during recent years. In this article tied-arch bridge and cable-stayed bridge have been compared to each other using axial force index method. Four tied-arch bridge alternatives and four cablestayed bridge alternatives are studied using the same total length of the bridge and the same span lengths with the same effective width of the deck. All bridges have steel and concrete composite deck The bridges have six vehicle lanes.
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