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Experimental Study on the Influence of External Steel Plates on the Seismic Performance of Sleeve-Connected Fabricated Bridge Piers
DOI: 10.12677/HJCE.2022.116085, PDF, 下载: 126  浏览: 499

Abstract: To improve the seismic performance of fabricated piers with grouted sleeves placed in the foundation of the bearing, external steel plates were used to reinforce them and shaking table tests were carried out to compare fabricated piers without external steel plates with cast-in-place piers. The dynamic characteristics, acceleration and displacement responses of the three piers were tested and analysed. The results show that all piers are subject to bending damage. The acceleration and displacement responses of the three piers were different but similar in form. At the end of the loading, the external steel plate pier has the highest self-vibration frequency, the highest stiffness and the least damage. The external steel plates strengthen the core concrete restraint of the fabricated piers and improve the overall seismic performance, which is an effective way to improve the seismic performance of the fabricated piers.

1. 引言

2. 试验简介

2.1. 装配式桥墩的相似设计

Table 1. Consistent similarity rate

2.2. 模型尺寸构造

2.3. 材料性能

2.4. 地震波和荷载工况

(a) CIP桥墩 (b) SPC桥墩 (c) ESP桥墩

Figure 1. Bridge pier model construction

Table 2. System resulting data of standard experiment

(a) El-centro波 (b) Taft-21˚波 (c) Taft-111˚波

Figure 2. Selection of seismic waves

3. 振动台试验结果分析

3.1. 试验现象

(a) CIP桥墩 (b) SPC桥墩 (c) ESP桥墩

Figure 3. Bridge pier damage forms

3.2. 动力特性

${\omega }_{n}=\sqrt{\frac{k}{m}}$ (1)

${f}_{n}=\frac{{\omega }_{n}}{2\text{π}}$ (2)

$\Delta =\frac{|{f}_{终}-{f}_{0}|}{{f}_{0}}$ (3)

Table 3. White noise scanning of pier inherent frequencies

3.3. 加速度分析

(a) El-centro波 (b) Taft-21˚波 (c) Taft-111˚波

Figure 4. Time course of acceleration at the top of the pier

(a) El-centro波 (b) Taft-21˚波 (c) Taft-111˚波

Figure 5. Peak value acceleration of the pier top

3.4. 位移分析

Figure 6. Time course of pier top displacement under Taft 111˚ waves

(a) Taft111˚波最大值 (b) Taft111˚波最小值

Figure 7. Taft111˚ peak relative displacement of pier top

4. 结论

1) 各个桥墩均为受弯破坏，出现了大量的横向贯通裂缝，其动力响应和表现形式相似，但装配式桥墩的抗震性能优于现浇桥墩。

2) 随着PGA的不断增加，各个试件墩顶加速度、位移和应变响应均在增大，自振频率不断减小，各个试件核心混凝土和钢筋依然有传力性能，试件阻尼比变化不大。

3) 外置钢板加强了桥墩核心混凝土约束效应，使得桥墩整体抗震性能有所提高，在灌浆套筒连接预桥墩的基础上外置钢板是一种提升其抗震性能的有效方式。

NOTES

*通讯作者。

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