系杆拱桥吊杆索力增量测试方法对比研究

Comparative Study of Cable Tension Increment Test Methods to Tied Arch Bridge Suspender

吊杆索力增量的测试是系杆拱桥荷载试验中较为重要的一个环节,能较好反映吊杆的工作性能。以一座系杆拱桥为研究对象,设置7种荷载工况,分别使用频率法、应变法和引伸计法对吊杆索力增量进行测试研究,并将测试结果与理论计算结果进行对比分析。通过研究可知:频率法和应变法的结合使用,能够更加客观反应索力增量的变化;引伸计法容易受到外界因素干扰,不建议使用。

TThe test of cable tension increment is an important link in the load test of tied arch bridge, which can better reflect the working performance of the hanger. A tied arch bridge is taken as the research object, and 7 load conditions are set up. Frequency method, strain method &extensometer method are used to test the increment of cable force of the hanger, and the test results are compared with the theoretical calculation results.Through the study, it is known that the combination of frequency method & strain method can be more objective to respond to the change of cable force increment; the extensometer method is easily disturbed by external factors and is not suggested to be used.