Feasibility Study of Prestress Force Prediction for Concrete Beams Using Second-Order Deflections

Author:

Bonopera Marco12,Chang Kuo-Chun3,Chen Chun-Chung1,Sung Yu-Chi14,Tullini Nerio2

Affiliation:

1. Bridge Division, National Center for Research on Earthquake Engineering, No. 200, Sec. 3, Xinhai Road, Taipei 10668, Taiwan

2. Department of Engineering, University of Ferrara, No. 1, Via Saragat, Ferrara 44122, Italy

3. Department of Civil Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan

4. Department of Civil Engineering, National Taipei University of Technology, No. 1, Sec. 3, Zhongxiao E. Road, Taipei 10608, Taiwan

Abstract

The safety and sustainability of prestressed concrete bridges can be improved with accurate prestress loss prediction. Considerable loss of the prestress force may imply damages hidden in the bridge. In this study, a prestress force identification method was implemented for concrete beams. Based on the Euler–Bernoulli beam theory, the procedure estimates the prestress force by using one or a set of static displacements measured along the member axis. The implementation of this procedure requires information regarding the flexural rigidity of the beam. The deflected shape of a post-tensioned concrete beam, subjected to an additional vertical load, was measured in a short term in several laboratory experiments. The accuracy of the deflection measurements provided favorable prestress force estimates. In particular, the “compression-softening” theory was validated for uncracked post-tensioned concrete beams.

Publisher

World Scientific Pub Co Pte Lt

Subject

Applied Mathematics,Mechanical Engineering,Ocean Engineering,Aerospace Engineering,Building and Construction,Civil and Structural Engineering

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