多遇地震下少筋混凝土重力式桥墩验算指标研究

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Abstract Research purposes:Concrete gravity type piers with low longitudinal reinforcement ratio are extensively used in high-speed railway in China. However, how to check such structures is not specified in current technical codes. With the round end pier of 32 m simply-supported girder bridge as research subject, how to check the structures by eccentricity and stress indexes is studied. The effect of longitudinal reinforcement on improving the bearing capacity and stability of the pier is discussed.
Research conclusions:(1) The allowable stress approach or section eccentricity could be used to check concrete gravity type piers with low longitudinal reinforcement ratio. Strength and stability of the pier can be ensured when the allowable stress approach is used. (2) When section eccentricity is used as checking index, the restriction values may vary from longitudinal reinforcement ratio. (3) For the round end piers with longitudinal reinforcement ratio of 0.1%, 0.2%, 0.3% and 0.4%, permissible eccentricity can be magnified to corresponding values for 0.90S, 1.0S, 1.1S, 1.2S. (4) The results can provide a theoretical basis for calculation method of the concrete gravity type pier with low longitudinal reinforcement ratio under low-level earthquakes.

Key words： high-speed railway gravity type pier concrete with low longitudinal reinforcement ratio low-level earthquake checking index

Received: 06 May 2014

PACS:

U 442.5

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	Articles by authors
	ZHANG Yong-liang
	CHEN Xing-chong
	DING Ming-bo
	PEI Lu

Cite this article:

ZHANG Yong-liang,CHEN Xing-chong,DING Ming-bo, et al. Research on the Checking Indexes of Concrete Gravity Type Piers with Low Longitudinal Reinforcement Ratio under a Low-level Earthquake[J]. 铁道工程, 2014, 31(11): 72-76.

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http://10.2.3.131/Jwk_tdgcxb/EN/ OR http://10.2.3.131/Jwk_tdgcxb/EN/Y2014/V31/I11/72

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