夹片咬合力测试方法

张峰; 刘佳琪; 高磊; 刘冠之

doi:10.19818/j.cnki.1671-1637.2019.03.004

夹片咬合力测试方法

doi: 10.19818/j.cnki.1671-1637.2019.03.004

山东大学岩土与结构工程研究中心, 山东济南 250061

基金项目:

国家自然科学基金项目 51108249

山东省自然科学基金项目 ZR2016EEM21

详细信息

作者简介:
张峰(1978-), 男, 江苏泰州人, 山东大学教授, 工学博士, 从事预应力混凝土梁桥典型病害防治和加固研究

中图分类号: U446.3
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出版历程
- 收稿日期: 2018-12-20
- 刊出日期: 2019-06-25

Test method of clip bite force

Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, Shandong, China

More Information

Author Bio:
ZHANG Feng(1978-), male, professor, PhD, zhangfeng2008@sdu.edu.cn

摘要

摘要: 为研究采用拉脱法检测预应力钢绞线受力时, 张拉力荷载测试曲线突变段和夹片咬合力的关系, 在夹片脱开时, 采用电阻式压力传感器高频采集技术测试了预应力混凝土梁锚具下方和锚具外侧钢绞线的受力, 共测试了20个样本; 设计了夹片咬合力测试方案, 共测试了326个样本, 并进行了统计分析, 建立了考虑张拉力的夹片咬合力计算公式; 通过37个样本的验证性测试, 研究了咬合力修正结果的测试精度; 在实际工程中检测了257个样本, 并将实测结果与提出的公式计算结果进行对比。研究结果表明: 当钢绞线伸长超过4.5 mm时, 夹片会脱离原有咬痕, 而实际测试中夹片脱开时会及时停止张拉, 因此, 拉脱法测试不会改变预应力钢绞线锚下有效预应力, 不会影响工程质量; 夹片安装时, 若夹片与锚杯锥孔不完全贴合, 会使夹片在横向产生较大的弹性挤压力, 形成附加摩擦力, 该摩擦力需要在夹片退出至与锚杯分开时才能完全消失, 此时锚外张拉力变化不明显, 因此, 拉脱法测试所得张拉力曲线中峰值拉力后的下降段斜率存在离散性, 与夹片安装精度有关; 拉脱法测试中夹片与锚杯的咬合力由锚下和锚外瞬态内力重分布累加组成, 提出的夹片咬合力计算公式能剔除由夹片与锚杯间咬合力产生的测试误差, 可使测试精度提高6.78%;实际工程现场实测夹片咬合力大于拉脱法测试所得张拉力曲线突变段, 因此, 采用拉脱法检测预应力钢绞线时, 锚下有效预应力为拉脱法测试所得张拉力曲线峰值与咬合力的差值。
- 桥梁工程 /
- 预应力钢绞线 /
- 拉脱法 /
- 咬合力
Abstract: To study the relationship between the mutation segment of tension test curve and the clip bite force when using the lift-off method to test the force of prestressed steel strand, the high-frequency acquisition technique in the resistive pressure sensor was used to test the prestressed steel strand forces of a prestressed concrete beam under and outside the anchorage when the clip disengages. A total of 20 samples were tested. The clip bite force test scheme was designed. A total of 326 samples were tested and the statistical analysis was performed. The calculation formula for the clip bite force considering the tension was established. Through the verification test of 37 samples, the test accuracy of bite force correction results was studied. 257 samples were tested in the actual project, and the test results were compared with the proposed calculated formula results. Research result shows that the clip will break away from the original bite mark when the steel strand extends more than 4.5 mm. However, when the clip disengages during the actual test, the tension will be stopped in time, so the lift-off test will not change the effective prestress of prestressed steel strand under the anchorage and affect the project quality. When installing the clip, if the clip does not completely fit the taper hole of socket, the clip will have a large elastic pressing force in the lateral direction to form an additional friction force. The friction force will completely disappear when the clip is separated from the socket. The change of tension outside the anchorage is not obvious at this moment, so the slope of descending segment of tension test curve obtained by the lift-off method has a dispersion after the peak tension, and it is related to the clip installation precision. The bite force of socket in the lift-off test consists of the transient internal force redistributions under and outside the anchorage. The proposed calculation formula for clip bite force can eliminate the test error caused by the bite force between the clip and the socket, and improve the test accuracy by 6.78%. The test bite force in the actual project is larger than the mutation segment of tension test curve obtained by the lift-off method. Therefore, when using the lift-off method to test the prestressed steel strand, the effective prestress under the anchorage is the difference between the peak value of tension test curve obtained by the lift-off method and the bite force.
- bridge engineering /
- prestressed steel strand /
- lift-off method /
- bite force

HTML全文

图 1 拉脱法测得的典型预应力钢绞线张拉力曲线

Figure 1. Typical prestressed steel strand tension curve tested by lift-off method

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图 2 夹片脱开瞬间钢绞线的内力重分布

Figure 2. Internal force redistribution of steel strand at moment of clip disengaging

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图 3 20m T梁布置(单位: mm)

Figure 3. Layout of 20 m T-beam (unit: mm)

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图 4 拉脱法测试过程

Figure 4. Lift-off test process

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图 5 N1管道预应力钢绞线张拉力第1次测试(样本1)

Figure 5. First test on tension of prestressed steel strand in pipeline N1 (sample 1)

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图 6 N1管道预应力钢绞线张拉力第2次测试(样本2)

Figure 6. Second test on tension of prestressed steel strand in pipeline N1 (sample 2)

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图 7 N1管道预应力钢绞线张拉力第3次测试(样本3)

Figure 7. Third test on tension of prestressed steel strand in pipeline N1 (sample 3)

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图 8 N1管道预应力钢绞线张拉力第4次测试(样本4)

Figure 8. Fourth test on tension of prestressed steel strand in pipeline N1 (sample 4)

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图 9 N2管道预应力钢绞线张拉力第1次测试(样本5)

Figure 9. First test on tension of prestressed steel strand in pipeline N2 (sample 5)

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图 10 预应力钢绞线张拉力测试曲线特征点

Figure 10. Characteristic points of prestressed steel strand tension test curves

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图 11 夹片与锚具示意

Figure 11. Schematic of clip and anchorage

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图 12 夹片脱空

Figure 12. Clip separation

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图 13 预应力钢绞线张拉力测试误差

Figure 13. Test errors of tension of prestressed steel strand

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图 14 夹片咬合力试验

Figure 14. Test on clip bite force

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图 15 夹片咬合力测试结果

Figure 15. Test results of clip bite force

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图 16 测试结果验证

Figure 16. Verification of test results

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图 17 实际工程测试

Figure 17. Actual project test

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图 18 预应力钢绞线张拉力测试曲线AB段数据统计结果

Figure 18. Data statistics results of AB segment of test curve of prestressed steel strand tension

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表 1 试验数据

Table 1. Test data kN

样本编号	A点数值	B点数值	C点数值	D点数值	E点数值	AB段数值	CD段数值	AC段数值
1	124	114	110	114	109	10	4	14
2	123	121	111	121	110	2	10	12
3	138	121	116	118	115	17	3	22
4	130	119	114	117	114	11	4	16
5	120	116	114	117	113	4	2	6
6	136	120	113	120	111	16	7	23
7	139	117	108	117	107	22	9	31
8	134	113	107	113	107	21	6	27
9	74	66	62	66	62	8	4	12
10	74	68	64	68	63	6	4	10
11	72	65	61	65	59	7	4	11
12	70	64	60	64	59	6	4	10
13	87	68	63	68	63	19	5	24
14	84	72	65	72	65	12	7	19
15	76	63	57	63	57	13	6	19
16	72	64	58	64	58	8	6	14
17	75	65	58	65	58	10	7	17
18	72	64	58	64	58	8	6	14
19	69	63	58	63	58	6	5	11
20	66	62	58	62	58	4	4	8

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