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薄壁墙式墩结构装配式方案及其抗震性能分析

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  • 国家科技期刊平台
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针对既有柱式墩预制拼装技术难以应用于截面横纵比大的薄壁墙式墩的问题，提出了一种节段水平并联的新型装配式桥墩结构方案，预制节段采用双向无黏结预应力筋、灌浆套筒及混凝土剪力榫混合连接。依托某国际机场飞机荷载宽幅桥梁工程实例，基于ABAQUS平台分别建立了新型装配式桥墩和现浇桥墩的精细化有限元模型，通过拟静力分析对比研究了 2种桥墩抗震性能的差异，并讨论了预应力筋配筋率以及剪力榫埋深对新型装配式桥墩抗震性能的影响规律。结果表明:新型装配式桥墩与现浇桥墩在纵向水平荷载作用下呈现墩底塑性铰充分发展的弯曲破坏形态，而在横向水平荷载作用下则呈现弯剪破坏形态;相较于现浇桥墩，装配式桥墩纵桥向与横桥向水平承载力分别提高68。5％和43。0％，但残余位移分别降低49。2％和67。8％;增大竖向预应力筋配筋率可显著提升装配式桥墩的水平承载力，而增加水平向预应力筋配筋率和剪力榫埋深则对限制节段接缝处的相对变形作用明显。
A prefabricated structure scheme for thin-wall pier and seismic performance analysis
Aiming at the problem that the prefabricated assembly technology of the existing column piers is dif-ficult to be applied to the thin-wall piers with large cross-section ratio,a new segmental horizontal parallel pre-fabricated pier structure scheme was proposed.The prefabricated segments were connected by bidirectional un-bonded prestressed tendons,grouting sleeves and concrete shear keys.Based on a project example of an air-craft-loaded wide bridge at an international airport,the refined finite element models of new prefabricated pier and cast-in-place pier were established using ABAQUS platform.The quasi-static analyses were conducted to compare the seismic performance of two piers,and the effect of prestressed tendon ratios and the depth of shear key on the seismic performance of the new prefabricated pier was systematically discussed.The results show that the new prefabricated pier and cast-in-place pier show the bending failure mode with fully developed plastic hinge at the bottom of the pier under longitudinal load,while the two piers show the bending-shear fail-ure mode under transverse load.Compared with cast-in-place pier,the longitudinal and transverse bearing ca-pacity of prefabricated pier is increased by 68.5％and 43.0％,respectively,but the residual displacement is decreased by 49.2％and 67.8％,respectively.Increasing vertical prestressed tendon ratio can significantly in-crease the horizontal bearing capacity of the prefabricated pier,and increasing horizontal prestressed tendon ra-tio and the depth of shear key can limit the relative deformation of the joint.

thin-wall piersegmental horizontal parallel prefabricated pierbidirectional unbonded prestressed tendonsconcrete shear keyseismic performance

张琰、江辉、文霁、李辰、高学奎、赵星燕、滕启杰

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北京交通大学土木建筑工程学院,北京 100044

民航机场规划设计研究总院有限公司,北京 100101

薄壁墙式墩 节段水平并联装配式桥墩 双向无黏结预应力筋 混凝土剪力榫 抗震性能

中央高校基本科研业务费专项资金资助项目中国民航机场建设集团有限公司科研资助项目国家自然科学基金资助项目北京市自然科学基金资助项目

2023YJS050JSRDKYN20220202523784738192035

2024

10.3969/j.issn.1001-0505.2024.04.014

东南大学学报(自然科学版)
东南大学

东南大学学报(自然科学版)

CSTPCD北大核心
影响因子：0.989
ISSN：1001-0505
年,卷(期)：2024.54(4)
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