罕遇地震下城际铁路连续梁桥延性抗震设计

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Abstract Research purposes: The intercity railway bridge could enter into elastic － plastic stage under rare eathquake excitation，it has a significant e ngineering value and research meaning to do elastic － plastic seismic analysis and dutility design of intercity railway bridge． Taking a Dalian JinPu intercity railway continuous bridge as as the engineering background，based on the principle of fiber beam － column element model，the elasitc － plastic analysis model of ( 25 + 30 + 25) m prestressed concrete continuous box girdger bridge is modeled，the railway code response spectrum has been converted to artificial earthquake time － history curve using fourier transform method． Furtherly，the rare seismic analysis and ductility design is presented．

Research conclusions: The results show that only braking pier enter into plastic stage under rare earthquake excitation， the maximum value of ductily coefficient is 3． 02，smaller than railway code given value 4． 8，meet standard requirements． The seismic elastic － plastic analysis and ductility design method presented provide a practical method and design basis．

Key words： intercity railway continuous bridge plastic hinge rare earthquake ductility design elastic － plastic analysis fiber model．

Received: 03 February 2012

PACS:

U442． 5

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2012/V29/I4/66

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