MEASUREMENT AND ANALYSIS OF EARLY-AGE CAMBER OF PRESTRESSED CONCRETE DOUBLETEES

LIU Yanming; WANG Xiaofeng; ZHAO Yong

doi:10.13204/j.gyjzG20080704

Volume 51 Issue 6

Oct. 2021

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LIU Yanming, WANG Xiaofeng, ZHAO Yong. MEASUREMENT AND ANALYSIS OF EARLY-AGE CAMBER OF PRESTRESSED CONCRETE DOUBLETEES[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(6): 67-71. doi: 10.13204/j.gyjzG20080704

Citation:

LIU Yanming, WANG Xiaofeng, ZHAO Yong. MEASUREMENT AND ANALYSIS OF EARLY-AGE CAMBER OF PRESTRESSED CONCRETE DOUBLETEES[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(6): 67-71. doi: 10.13204/j.gyjzG20080704

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MEASUREMENT AND ANALYSIS OF EARLY-AGE CAMBER OF PRESTRESSED CONCRETE DOUBLETEES

doi: 10.13204/j.gyjzG20080704

1. College of Civil Engineering, Tongji University, Shanghai 200092, China;
2. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China

Received Date: 2020-08-07
Available Online: 2021-10-27

Abstract

Abstract

The cambers of three prestressed concrete doubletees with concrete strength grade of C50 at the moment of prestressed tendons releasing and the age of 7 days were measured, meanwhile, the elastic modulus and compressive strength of the concrete specimens with the same material and curing condition were tested. The result showed that when steam curing for 30 hours or natural curing for 3 days, the compressive strength of the concrete could reach 80% of the designed concrete strength grade value, but the elastic modulus of the concrete only reached 38~55% of the standard value. The elastic modulus of the tested concrete with an age of 7 days could reach its standard value. Compared to natural-cured concrete, the compressive strength and elastic modulus of steam-cured concrete developed more rapidly. The time-effect model of concrete elastic modulus within the age of 7 days was obtained by regression analysis. Then a simulation analysis of the cambers at the age of 7 days was carried out based on the model of creep and shrinkage in MC 2010, and the calculated values were almost coincident with the measured values.
- prestressed concrete doubletees,
- elastic modulus of concrete,
- releasing of prestressed tendons,
- prestressed camber

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