采用预应力筋进行RC桥墩地震损伤控制的试验研究
发布时间：2019-05-08 21:51
【摘要】：为评价采用预应力筋进行钢筋混凝土桥墩地震损伤控制的有效性,设计6个竖向配置无粘结预应力筋和1个无预应力筋的钢筋混凝土桥墩试件,并分别进行了固定轴力下的拟静力加载试验。详细对比各试件的抗震性能并重点关注试件混凝土开裂和残余位移等地震损伤情况。结果表明,在桥墩试件中配置竖向预应力筋可有效减少其裂缝宽度和残余位移,提高试件的承载力和抗弯刚度,但在一定程度上降低了试件的耗能能力;确保预应力筋不拉断或松弛是桥墩地震损伤控制设计的关键;增加预应力筋初始应力,可减少桥墩的裂缝宽度,减少试件的延性和耗能能力,但对试件的残余位移和刚度退化影响不明显;改变预应力筋的位置对桥墩裂缝宽度、残余位移、延性及耗能能力、刚度退化等均未产生明显影响。
[Abstract]:In order to evaluate the effectiveness of using prestressed tendons to control seismic damage of reinforced concrete piers, six specimens of reinforced concrete piers equipped vertically with unbonded prestressed tendons and one reinforced concrete pier without prestressed tendons were designed. The quasi-static loading tests under fixed axial force are carried out respectively. The seismic performance of each specimen is compared in detail, and emphasis is paid to the seismic damage such as concrete cracking and residual displacement. The results show that the vertical prestressed tendons can effectively reduce the crack width and residual displacement, improve the bearing capacity and flexural stiffness of the specimens, but to a certain extent, reduce the energy dissipation capacity of the specimens. Ensuring that the prestressed tendons do not break or relax is the key to the seismic damage control design of piers. Increasing the initial stress of prestressed tendons can reduce the crack width of pier, reduce the toughness and energy dissipation capacity of specimens, but has no obvious effect on the degradation of residual displacement and stiffness of specimens. Changing the position of prestress tendons has no obvious effect on the crack width, residual displacement, ductility, energy dissipation capacity and stiffness degradation of piers.
【作者单位】： 大连海事大学;辽宁省公路工程重点实验室;大连理工大学;
【基金】：国家重点基础研究发展计划(973项目)(2011CB013605) 国家自然科学基金(51008041) 中央高校基本科研业务费(3132013068,3132013315) 教育部新世纪优秀人才支持计划(NCET-12-0751)
【分类号】：U443.22
[Abstract]:In order to evaluate the effectiveness of using prestressed tendons to control seismic damage of reinforced concrete piers, six specimens of reinforced concrete piers equipped vertically with unbonded prestressed tendons and one reinforced concrete pier without prestressed tendons were designed. The quasi-static loading tests under fixed axial force are carried out respectively. The seismic performance of each specimen is compared in detail, and emphasis is paid to the seismic damage such as concrete cracking and residual displacement. The results show that the vertical prestressed tendons can effectively reduce the crack width and residual displacement, improve the bearing capacity and flexural stiffness of the specimens, but to a certain extent, reduce the energy dissipation capacity of the specimens. Ensuring that the prestressed tendons do not break or relax is the key to the seismic damage control design of piers. Increasing the initial stress of prestressed tendons can reduce the crack width of pier, reduce the toughness and energy dissipation capacity of specimens, but has no obvious effect on the degradation of residual displacement and stiffness of specimens. Changing the position of prestress tendons has no obvious effect on the crack width, residual displacement, ductility, energy dissipation capacity and stiffness degradation of piers.
【作者单位】： 大连海事大学;辽宁省公路工程重点实验室;大连理工大学;
【基金】：国家重点基础研究发展计划(973项目)(2011CB013605) 国家自然科学基金(51008041) 中央高校基本科研业务费(3132013068,3132013315) 教育部新世纪优秀人才支持计划(NCET-12-0751)
【分类号】：U443.22
【参考文献】
相关期刊论文 前4条
1 张荣;苏小卒;;竖向加预应力钢筋混凝土柱抗震性能试验研究[J];同济大学学报(自然科学版);2006年12期
2 徐世p，
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