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The Research of Damage Diagnosis of Reinforced Concrete Beam and Reinforced Frame Using Dynamic Test Data

Author: LiPeng
Tutor: YiWeiJian
School: Hunan University
Course: Structural Engineering
Keywords: Damage diagnosis Vibration test Parameter Identification Modal Analysis
CLC: TU375.4
Type: Master's thesis
Year: 2009
Downloads: 99
Quote: 0
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Abstract


With economic development, the span, the construction of high-level and complex engineering structures, structural failure brought the risk of loss increases. Whether structural performance, building energy efficiency point of view, will be the promotion and use of HRB500 rebar. HRB500 grade reinforced in our the modal dynamic performance as a major force reinforced components research is still relatively small, so this study can provide a theoretical basis and experimental basis HRB500 grade reinforced applications. This paper studies the HRB500 grade reinforced by the force 主筋 three concrete foot foot beam and two bay layer two cross framework Experimental Study, at the same time be a HRB335 concrete foot foot beam and a bay HRB400 frame beam comparison test. Static test using two-point symmetrical loading program grading load, record the test beam deflection and fracture characteristics. Static load for dynamic test required for the manufacture of different degree of injury. The dynamic test data, respectively, in the initial state of the test beam, as well as a variety of different damage state and dynamic test data including natural frequency and mode shapes. Vibration tests were used dual acceleration sensor displacement modal analysis. In this paper, based on the the modal inversion injury indicators positioning method, the test results of the test beam vibration analysis. The main contents include discriminate whether structural system injury and injury the effective discriminant positioning and injury severity. Based on structural dynamics theory, the article discusses a variety of damage identification basic principles and calculation methods, including: the rate of change of the natural frequency, modal confidence factor, modal strain energy, the residual force vector strain modes, modal strain energy change in stiffness, flexibility matrix. The above indicators identification and location of the test component damage, through the results of comparing the accuracy of structural damage identification. The research results show that the mere access to the natural frequency can not accurately determine the damage state of the structural members and the damage location, only the structure of preliminary judging whether the injury occurs. Combined with the frequency mode shapes can an accurate diagnosis of a more serious injury. Such as the rate of change of the compliance matrix integrated shapes change and changes in the frequency, this is the most effective method of identify the location and extent of structural damage.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures > Frame
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