|Table of Contents|

Seismic performance of prefabricated assembled pier with grouted sleeve and prestressed reinforcements(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2018年02期
Page:
42-52
Research Field:
道路与铁道工程
Publishing date:

Info

Title:
Seismic performance of prefabricated assembled pier with grouted sleeve and prestressed reinforcements
Author(s):
GE Ji-ping1;  YAN Xing-fei2; 3;  WANG Zhi-qiang4
1. School of Urban Construction and Safety Engineering, Shanghai Institute of Technology, Shanghai 201418, China; 2. Shanghai Urban Construction Design Research Institute(Group)Co., Ltd., Shanghai 200125, China; 3. Shanghai Technology Research Center of Industrial and Prefabricated Municipal Engineering, Shanghai 200125, China; 4. Department of Bridge Engineering, Tongji University, Shanghai 200092, China
Keywords:
railway bridge;  prefabricated assembled pier;  seismic performance;  pseudo-static test;  grouted sleeve;  prestressed reinforcement
PACS:
U443.22
DOI:
-
Abstract:
According to the mechanical characteristics of prefabricated assembled piers for rail transit, the assembly scheme of grouted sleeve and prestressed reinforcements was put forward. Three different types of piers were designed, including the integral cast-in-place reinforced concrete specimen(RC), the prefabricated and prestressed concrete specimen with strands and grouted sleeves(PCSS), and the prefabricated and prestressed concrete specimen with screw thread steel bar and grouted sleeve(PCTS). The evaluation results of various pseudo-static evaluation indicators for each type of bridge pier were analyzed by using pseudo-static test method. The seismic performances of various kinds of piers were compared. Test result shows that the indexes of PCSS and PCTS are very similar, and the maximum error is 2.2%. The grouted sleeve shifts the traditional area of plastic hinge up to the top of grouted sleeve, so it shows that the grouted sleeve has local reinforcing effect on the traditional plastic hinge region, and the height of plastic hinge stirrup is advised to add extra one height of grouted sleeve. The concrete axial pressure of specimen increases by 1 time when using prestressed reinforcements, and the corresponding cracking load also increases by approximate 1 time. The mean values of yield load and ultimate load of PCSS are 31% and 34% higher than those of RC, respectively. The average equivalent yield displacement, ultimate displacement and drift ratio are 17%, 13% and 13% higher than those of RC, respectively, but the ductility factors of PCSS decreases by 10%. At the same drift ratio of 6%, the mean residual displacement of PCSS is 61% of RC, which shows better re-centering capacity. Compared with RC, the stiffness of PCSS increases by 13%. Compared to screw thread steel bar, steel strands can be bent and bundled, and the area is flexible to adjust. So the bridge pier specimens with unbonded prestressed reinforcements and grouted sleeve have better operation and seismic performance, and can be served as the recommended scheme for prefabricated assembled rail pier. 6 tabs, 19 figs, 26 refs.

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Last Update: 2018-05-20