| 邓鸣,王飞,王磊*,伍一,戴理朝,赵志军.预应力钢丝绳加固既有PC空心板的抗弯性能试验研究[J].实验力学,2018,33(6):911~918 |
| 预应力钢丝绳加固既有PC空心板的抗弯性能试验研究 |
| Experimental study of flexural behavior of existing PC hollow slab strengthened by prestressed steel wire rope |
| 投稿时间：2017-08-03 修订日期：2017-10-29 |
| DOI：10.7520/1001-4888-17-156 |
| 中文关键词: 桥梁工程 预应力混凝土 加固 钢丝绳 承载力 |
| 英文关键词:bridge engineering prestressed concrete strengthen steel wire ropes capacity |
| 基金项目:国家重点基础研究发展计划(“九七三”计划)项目(2015CB057705)； 长沙市科技计划项目(ZD1601063) |
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| 中文摘要: |
| 本文利用预应力钢丝绳对某座既有预应力混凝土(PC)梁桥进行了加固,详细介绍了双层预应力钢丝绳加固的设计原则和施工工艺，对加固前后的PC板梁桥进行了荷载试验,对比了正常使用状态下梁体加固前后的荷载-挠度、裂缝宽度和钢筋应力的变化规律。研究表明：预应力钢丝绳加固能有效降低挠度，抑制裂缝和减小钢筋应变，进而显著提高既有PC桥梁的抗弯承载力。在设计荷载作用下，加固梁的挠度、裂缝宽度以及钢筋应力分别下降了23%、50%和21%。相对于降低挠度和减小钢筋应变而言，该加固方法对于梁底裂缝的控制更具效果。预应力钢丝绳加固梁的整体性能得到提升，抗弯性能满足规范的要求。 |
| 英文摘要: |
| An existing prestressed concrete bridge was strengthened by prestressed steel wire rope (PSWR). The design principle and construction technology of double-layer prestressed steel wire rope reinforcement are introduced in detail in this paper. Load experiment of the PC-slab girder bridge before and after reinforcement was carried out, and the variation pattern of load-deflection, crack width and reinforcement stress of the beam before and after strengthening was compared under normal condition. Static loading experimental results indicate that PSWR enhances the overall performance of girder by decreasing deflection, crack width, and steel stress. The strengthening effects of PSWR on structural behavior are also discussed, such as deflection, crack width and steel stress. The deflection, crack width and steel stress under the design load decrease 23%, 50% and 21%, respectively, using PSWR strengthening. PSWR has the significant restraint effect on crack width than that on deflection and steel stress. The girder strengthened with PSWR can satisfy the serviceability. |
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