Structural Piers to Support the LRT System
Structural Piers to Support the LRT System
The railroad network and stations (Fig. 1) consist of a simple beam system resting on RC piers built along the LRT route. A problem arises when it is not possible to cast concrete for the cantilevers on some piers located on roads that have a high frequency of traffic congestion. Using this method would cause an almost total block- age of traffic flow. One solution to this problem is to replace the RC piers [Fig. 2(a)] with hybrid piers [Fig. 2(b)]. The hybrid pier is a pier structure in which a steel structure and a RC structure are combined. This system is a good option, because it promises a final structure that is justified economically with an efficient construction process (Morino 1998; Roeder 1998). In the LRT project, the hybrid pier design is a modification of previous RC piers, that is, the RC part of the cantilever [Fig. 2(a)] is substituted with a steel frame [Fig. 2(b)]. The current RC pier design will still be used for the columns and foundations. It is apparent that a reconfiguration of the reinforcement of the columns used for the hybrid piers is needed to accommodate the steel frames. By using this hybrid pier system, the steel frames can be fabricated offsite, and the installation process can take place during off-peak hours and take less time.
The railroad network and stations (Fig. 1) consist of a simple beam system resting on RC piers built along the LRT route. A problem arises when it is not possible to cast concrete for the cantilevers on some piers located on roads that have a high frequency of traffic congestion. Using this method would cause an almost total block- age of traffic flow. One solution to this problem is to replace the RC piers [Fig. 2(a)] with hybrid piers [Fig. 2(b)]. The hybrid pier is a pier structure in which a steel structure and a RC structure are combined. This system is a good option, because it promises a final structure that is justified economically with an efficient construction process (Morino 1998; Roeder 1998). In the LRT project, the hybrid pier design is a modification of previous RC piers, that is, the RC part of the cantilever [Fig. 2(a)] is substituted with a steel frame [Fig. 2(b)]. The current RC pier design will still be used for the columns and foundations. It is apparent that a reconfiguration of the reinforcement of the columns used for the hybrid piers is needed to accommodate the steel frames. By using this hybrid pier system, the steel frames can be fabricated offsite, and the installation process can take place during off-peak hours and take less time.
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