2段式预制拼装预应力混凝土桥墩的抗震性能

发布时间：2018-09-19 15:20

【摘要】：以某拟建轨道交通桥墩为原型,按照相似比1:3进行整体现浇桥墩RC和预应力预制拼装桥墩PCS的设计。采用拟静力试验方法,一方面研究原型桥墩的正常使用性能和抗震性能,另一方面重点研究按照等效抗震性能设计原则设计的预制拼装桥墩的正常使用性能和抗震性能。研究结果表明:PCS的开裂荷载是RC桥墩的1.5倍。预应力混凝土节段拼装桥墩在地震作用下,墩柱整体损伤较小,主要是墩底附近混凝土发生开裂和压碎。在相同最大偏移率6%下,PCS的残余位移只有整体现浇试件的44%,PCS试件的耗能能力只有RC试件的1/3。预应力筋的初始预应力保持在屈服强度的30%,可以使墩柱在侧向偏移率达到6%时预应力筋也不会断裂。节段拼装预应力桥墩PCS可以取得与普通钢筋混凝土结构一样的荷载位移骨架曲线,具有较小的残余变形和良好的自复位能力,但是耗能能力差。
[Abstract]:Based on the prototype of a proposed rail transit pier, the RC of the whole cast-in-place pier and the prefabricated assembled pier PCS are designed according to the similarity ratio of 1:3. The pseudostatic test method is used to study the normal performance and seismic performance of the prototype pier on the one hand, and the normal performance and seismic performance of the precast assembled pier designed according to the design principle of equivalent seismic performance on the other hand. The results show that the cracking load of RC pier is 1.5 times of that of RC pier. Under earthquake action, the damage of pier column is small, which is mainly caused by cracking and crushing of concrete near the bottom of pier. At the same maximum deviation rate of 6%, the residual displacement of PCS is only 44% of the total cast-in-situ specimen, and the energy dissipation capacity of the PCS specimen is only 1 / 3 of that of the RC specimen. If the initial prestress of the prestressed tendons is kept at 30% of the yield strength, the prestressed tendons will not break when the lateral deviation ratio of the piers reaches 6. PCS can obtain the same load-displacement skeleton curve as the common reinforced concrete structure, which has small residual deformation and good self-reset ability, but the energy dissipation capacity is poor.
【作者单位】：上海应用技术大学城市建设与安全工程学院;上海市城市建设设计研究总院;上海工业化装配化市政工程技术研究中心;同济大学桥梁工程系;
【基金】：国家自然科学基金资助项目(51408360) 上海市科委工程技术研究中心建设专项资助项目(17DZ2251900)
【分类号】：U442.55;U443.22

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