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V»4,2«6 (Cont'd)(Nbvember f 1983)Statical treatment of sal ami o effects i®adequate for short span structures! but may resultin uneconomically large loadings for long spanstructures* %namio seiwaic analysis should" accordinglybe considered for structures of more than 100 m span®Seimxc forces occurring during major earthquakesoften cause the superstructures of bridges to slip sidewaysoff their supporting substructures* Consideration shouldbe given to this possibility* and if necessary physicalrestraints should be provided to prevent any such sidewaysmovement»

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