US 2019/0194883 A1Published application

Method for Improving Seismic Performance of Bridge by Using Beam Body and Energy Dissipation and Seismic Mitigation Bridge Bearing

AssigneeChina Railway Eryuan Engineering Group Co.,Ltd

InventorsJizhong YANG, Lie CHEN, Kejian CHEN, Yingliang WANG, Yinguang XU, Wanming ZHAI, Yongxing WEI, Mingjun LIU, Chengbiao CAI, Yongping ZENG, Xiaolong ZHEN, Ming YUAN, Lihui YOU, Dubei FENG, Zhigang YUAN

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Abstract

A method for improving the seismic performance of bridges by utilizing the beam body and an energy dissipation and seismic mitigation bridge bearing, which can effectively eliminate the harmful vibration of the bridge pier in the inherent frequency band, thus reducing the stress of the pier body and improving the seismic performance of the bridge pier without introducing external additional mass and looking for an installation space on the pier. The method includes the following steps: obtain the natural frequency fi, the equivalent modal mass Mi and the modal stiffness Ki of the pier in the longitudinal or transverse direction by numerical modal analysis or experimental modal test; determine the mass mi of the beam body; calculate the connection stiffness ki and the connection damping ci between the beam body and the pier; select the bearing system with above connection stiffness ki and the connection damping ci.

Claims9

Dependent claims

A method for improving seismic performance of a bridge by using a beam body, wherein, the bridge comprises the beam body, a pier and a bearing system arranged between a top of the pier and longitudinal ends of the beam body;

the method comprising the following steps:
a. obtaining a natural frequency fi, an equivalent modal mass Mi and a modal stiffness Ki of the pier in a longitudinal or transverse direction by a numerical modal analysis or experimental modal test;
b. determining a mass mi of the beam body;
c. calculating a connection stiffness ki between the beam body and the pier with a first formula as following:
k
i
=
1
(
1
+
m
i
M
i
)
2

K
i
M
i

m
i
;
d. calculating a connection damping ci between the beam body and the pier with a second formula as following:
c
i
=
2


m
i

K
i
M
i

3

m
i
M
i
8

(
1
+
m
i
M
i
)
3
;
and
and
e. selecting the bearing system with the connection stiffness ki and the connection damping ci to improve seismic performance of the pier with the beam body as a dynamic vibration absorber.

59 more elements

Dependencies are inferred from the claim text.