摘要
为了掌握珠江大桥局部受力情况,在17#墩的1#块纵向预应力张拉施工时,测试了锚垫板附近箱梁混凝土的应变分布,通过理论计算与实测值的比较分析表明,测试得出的最大纵向压应变为-58.96με,锚垫板侧的最大横向压应变为-139.37με,相应的压应力分别为2.06 MPa和4.88 MPa,远小于混凝土的抗压设计强度.箱梁锚固区始终处于弹性工作状态,箱梁顶板混凝土纵向应变受压,横向受拉,实测值与理论计算值得出的规律是一致的,除了最接近张拉千斤顶附近外,测试应变值与理论计算值吻合较好,在锚垫板52 cm的范围内,箱梁混凝土纵横向均受拉,受力最为不利.
For investigating the local stressing situation of Zhujiang Bridge, the strain situation of the box - section beam concrete near the anchor plate is measured when the prestressed tendons of Segment 1 # of Pier 17 # were tensioned. The comparison of the theoretical results and measured values shows that the maximum longitudinal compression strain in the anchor area of the box girder was - 58.96με, and the maximum lateral compression strain was - 139.37με, the corresponding compression stress was 2.06 MPa and 4.88 MPa respectively, which is far smaller than the concrete compression strength. The anchor area of the box girder was in elastic situation all the time, while concrete of the top slab was in compression along the longitudinal direction and in tension along the lateral direction. The measured strain values except those near the tension jacks matched the theoretical values very well. The box girder concrete in the 52cm range of anchor plates was in the worst situation because it was in tension along the longitudinal and lateral directions.
出处
《郑州大学学报（工学版）》
CAS
2006年第3期42-45,共4页
Journal of Zhengzhou University（Engineering Science）
基金
广东省自然科学基金资助项目(000387)
关键词
锚下局部应力
测试
珠江特大桥
空间分析
local strain under anchor plate
test
Zhujiang Bridge
space analysis
