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Static load test on reinforced concrete cablestayed bridge with rare cablesstrengthened by external prestressed steel strand(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2021年1期
Page:
39-49
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Static load test on reinforced concrete cablestayed bridge with rare cablesstrengthened by external prestressed steel strand
Author(s):
SUN Quansheng1;  YU Haitao1;  XU Shengqi2
（1. School of Civil Engineering, Northeast Forestry University, Harbin 150040, Heilongjiang, China;2. China Desion Group Co., Ltd., Nanjing 210005, Jiangsu, China）
Keywords:
bridge engineering;  cablestayed bridge with rare cable;  comparative analysis;  external prestressed reinforcement;  static load test
PACS:
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DOI:
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Abstract:
In order to study the improvement of the static mechanical properties of the reinforced concrete cablestayed bridge with rare cables strengthened by external prestressed steel strand, the reinforcement project of the Muling River Cablestayed Bridge was considered as an example. Based on the damage situation of the cablestayed bridge and the existing reinforcement experience, a total of 5 different reinforcement schemes were proposed by changing the cable force parameters and the external prestressed steel strand parameters, and the damage state and different reinforcement schemes were simulated by establishing MIDAS finite element model, the displacement of the main beam, the deflection of the main tower, the cable force of the stayed cable, and the stress of the upper and lower edges of the main beam were used as evaluation indicators to analyze the optimal reinforcement plan under the design load. Then a static load test was set to compare the actual strengthened effect, the vertical displacement of the main girder, the section strain of the main girder and the main tower, the deflection of the main tower, and the typical increment of cable force were discussed in detail after strengthening. The results show that the scheme of main beam that strengthened by external prestressed steel strand can significantly reduce the vertical displacement of the main girder and the horizontal displacement of the main tower, and at the same time improve the stress on the upper and lower edges of the main girder to a certain extent, but the effect of cable force optimization is not much different in finite element analysis. In the study of static load test, the measured strain and displacement of the cablestayed bridge after reinforcement are less than the calculated value and the measured value before reinforcement, the deflection of a single measuring point is declined by up to 37.94%, and the strain at a single measuring point is declined by up to 43.47%, and crack width meets design requirements. The measured cable force is roughly in line with the calculated cable force. The rigidity reserve of the main beam is increased by up to 33%, and the strength reserve of the main beam is increased by up to 31%. The overall carrying capacity of cablestayed bridges has improved significantly after strengthening, it is feasible for the external prestressed steel strand to strengthen reinforced concrete cablestayed bridge with rare cables. The results of the study can be used as reference for the reinforcement of the rarecable reinforced concrete cablestayed bridge established early. 5 tabs, 12 figs, 23 refs.

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Last Update: 2021-01-25