J4  2011, Vol. 45 Issue (7): 1269-1275    DOI: 10.3785/j.issn.1008-973X.2011.07.022
 土木与建筑工程

1.浙江大学 空间结构研究中心,浙江 杭州 310058；2. 浙江展诚建设集团股份有限公司,浙江 杭州 310005
Monitoring and compensation of prestress relaxation of pre-tensioned
pin-bar structure
DENG Hua1, SONG Rong-min1, ZHUO Xin1, LOU Dao-an2
1. Space Structures Research Center, Zhejiang University, Hangzhou 310058, China；
2. Zhejiang Zhancheng Construction Group Ltd., Hangzhou 310005, China
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Abstract:

The mathematical model for analyzing the pre-tension deviation of prestressed pin-bar system was established in order to monitor and compensate of the tension deviation for in-service structures. The factors causing prestress relaxation were described as the change of member’s initial length. Based on the equation, in which the relationship between the length variations of active cables and the axial-force variations of inspected members was reflected, the principle of determining the number of inspected members was discussed by analyzing the properties of that equation’s roots. A method for locating the effective inspected members was also suggested by means of the variance sensitivity analysis of axial force increments of members to length increments of active cables. Equations were further deduced to calculate the tension deviation of active cables or their approximate least square solution according to the axial force deviation of inspected bars, and a parameter was defined to reflect the influence of relaxation of passive bars. The method for calculating the compensatory tension forces was proposed. An illustrative example shows that the method is effective for the quantitative monitoring and compensation analysis of tension deviation in pre-tensioned pin-bar structure．

 : TU 393.3

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#### 引用本文:

DENG Hua, SONG Rong-min, ZHUO Xin, LOU Dao-an. Monitoring and compensation of prestress relaxation of pre-tensioned
pin-bar structure. J4, 2011, 45(7): 1269-1275.

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