高速铁路多跨简支梁桥纵向地震力分布规律

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Abstract Research purposes: In order to study the influence of CRTSⅡ slab ballastless track system on the longitudinal seismic force of bearing and end-spine structure, integrated track and bridge model and conventional model are established respectively for the multi-span 32 m high-speed railway simply supported girder bridge. When considering the constraint of track system, the distribution law of the longitudinal seismic force in pier bearings is studied through adjusting pier height and span number. By discussing the relationships among the seismic force of pier bearings, abutment bearings and end spines, the distribution law of the longitudinal seismic force in the whole bridge structure is further analyzed.
Research conclusions: (1) Considering the effect of longitudinal constraint, the longitudinal seismic force of the fixed bearing for multi-span simply supported girder bridge presents a parabolic distribution that is small at the boundary and large in the middle span, while the longitudinal seismic force of the fixed bearing in the conventional model is distributed in a straight line. The bearing has an obvious region where the seismic response has been amplified, and the area, located near the middle span of the bridge, is related to the pier height and span number. (2) The amplification area coefficient increases with the increase of span number and decreases with the increase of pier height. When the span number is 50, the longitudinal seismic force of the bearing near the middle span is about 20 percent larger than that in the conventional model. (3) The distribution law of longitudinal seismic force of bearing relates to a dual effect incorporating the impact of track system on natural vibration period and the influence scope of boundary effect. (4) The research conclusions could be applied to the seismic design of simply supported girder bridge with gentle terrain and approximately equal height for all piers, which goes for high-speed railway.

Key words： high-speed railway simply supported girder integrated track and bridge model bearing longitudinal seismic force boundary effect

Received: 22 September 2021

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	Articles by authors
	ZHANG Yongliang
	WANG Chunyang
	LIU Zhengnan
	ZHU Hailong
	JI Xiang

Cite this article:

ZHANG Yongliang,WANG Chunyang,LIU Zhengnan, et al. Distribution Law of Longitudinal Seismic Force for Multi-span Simply Supported Girder Bridge of High-speed Railway[J]. Journal of Railway Engineering Society, 2022, 39(7): 55-60.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I7/55

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