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Research of Self Pre-stress Test of Concrete-filled Steel Tube Arch Bridge

Author: YangHaiTing
Tutor: HuangFuWei
School: Chongqing Jiaotong University
Course: Bridge and Tunnel Engineering
Keywords: concrete-filled steel tube self pre-stress model test testing
CLC: U448.22
Type: Master's thesis
Year: 2010
Downloads: 55
Quote: 1
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Abstract


High-performance expansive concrete is filled in the steel tube to counteract the separation of tube and concrete. This combination is called self-stressing concrete-filled steel tube (CFST). The study of self-stress calculation and self-stress detection are in inchoate state,and urgently need to investigating. In this dissertation, which founded by the test of a CFST arch bridge and model test, the preliminary research of self pre-stress test is carried out. The major work and results in the paper are summarized as follows:(1)Based on lots of literature, self pre-stress test methods are summarized as direct testing method, calculation and analysis method and indirect testing method, and indirect testing method is much more feasibility.(2) Self pre-stress test is a long-term monitoring process, through the comparison of characteristic and principle of different types of strain sensors, the vibrating wire sensor is considered more appropriate.(3) Using finite element procedure carried on modal analysis and confirmed the accuracy of theoretical formula. After parametric analysis, discovered: concretes free expansion rate and diameter thick ratio are much more important. Poisson’s ratio and modulus of elasticity is relatively negligible.(4)Three model specimens of self pre-stress concrete are carried out, test data stabilization is good and test sensitivity is also high, which indicates indirect testing method can be used for detection of self pre-stress.(5) Test of a CFST arch bridge is carried out and proved indirect testing method is a practical approach to test self pre-stress for long term. Effective expansive coefficient is proposed and the effective expansive coefficient of real bridge is given.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Arch bridge
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