Abstract
Many footbridges in Hong Kong are constructed of a prestressed concrete deck resting on bearings which are inserted in halving joints between the deck and the column heads, A common practice is to concrete the deck insitu at a higher level so as to facilitate the stressing operation. The deck is then lowered into position but this operation involves certain degree of risk as it requires the temporary supports to be adjusted while they are still loaded. This study is to focus on the elimination of the bearings such that the columns and the deck form a portal and the deck can be stressed without the high risk of lowering process. The applicability of this structural system is related to the concrete properties produced locally which show high creep and shrinkage values that may prohibit the use of the portal construction.
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