﻿ 装配式钢筋混凝土连续梁桥抗震性能分析

# 装配式钢筋混凝土连续梁桥抗震性能分析Seismic Performance Analysis of Prefabricated Reinforced Concrete Continuous Beam Bridges

Abstract: Based on finite element analysis software OpenSees, the numerical models of integral cast-in-place pier (RC), the prefabricated concrete pier with grouted sleeves (PCS) and the prefabricated and pre-stressed concrete pier with strands and grouted sleeves (PCSS) continuous girder bridges are estab-lished. Nonlinear time history analysis of three types of bridges is carried out and the displacement of pier top, re-centering capacity and hysteretic energy dissipation are compared. The results show that the displacement response of pier top of continuous girder bridge with prefabricated pier is less than that of cast-in-place pier continuous girder bridge, the residual displacement of PCSS continuous girder bridge is small, and it has better re-centering capacity. The hysteretic energy dissipation of PCS continuous girder bridge is similar to that of RC continuous girder bridge. The simulation method of prefabricated pier in this paper can be applied to the seismic analysis of bridge system.

1. 引言

2. 装配式桥墩拟静力模拟

Table 1. Main design parameters of piers

Table 2. Material properties of reinforcement bars

Table 3. Characteristics of concrete materials

RC墩和PCSS墩的荷载–位移滞回曲线对比如图1所示。

(a) RC试件 (b) PCSS试件

Figure 1. Hysteretic curve comparison

3. 连续梁桥概况

(a) 立面图(b) 平面图

Figure 2. Bridge layout (unit: cm)

4. 有限元模型的建立

4.1. 上部结构

4.2. 下部结构

4.3. 支座模拟

4.4. 地震波选取

Figure 3. EI Centro wave after AM

5. 分析结果

5.1. X向输入结果

Figure 4. X-directional displacement time-history curve of pier top

(a) RC墩滞回曲线 (b) PCS墩滞回曲线 (c) PCSS墩滞回曲线

Figure 5. Hysteretic curve of pier

5.2. Y向输入结果

Figure 6. Y-direction displacement time history curve of pier top

(a) RC墩滞回曲线 (b) PCS墩滞回曲线 (c) PCSS墩滞回曲线

Figure 7. Hysteretic curve of pier

6. 结论

1) 本文提出基于OpenSees有限元软件，建立装配式桥墩方法可以应用到整体装配式桥梁体系的分析研究中。

2) 通过对比PCS连续梁桥和RC连续梁桥的地震响应可知，PCS墩的X向峰值位移减小22.5%，Y向峰值位移减小17.8%；由于灌浆套筒增大了整桥刚度，PCS墩残余位移相对较小；PCS墩耗能能力和RC墩相差不大。结果表明PCS连续梁桥整体抗震性能与RC连续梁桥较为接近。

3) 通过对比PCSS连续梁桥和RC连续梁桥的地震响应可知，PCSS墩X向峰值位移减小44.1%，Y向峰值位移减小40.7%；由于PCSS墩配置了预应力筋，其拥有良好的自复位能力，残余位移很小；PCSS墩耗能能力相对RC墩较弱。结果表明PCSS连续梁桥整体抗震性能比RC连续梁桥好。

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