Papers by Author: Hong Wei Tang

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Authors: Dong Hai Xie, Hong Wei Tang
Abstract: In recent years,most existing engineering structures which have approached their normal life span, such as concrete plate, concrete beam etc., Almost all of these architecture structures are subjected to damage due to external loads, initial design defect etc. Structural damage detection and assessment has been becoming a focus of increasing interest in civil engineering field. However,At present, the study on structural damage detection is still at initial stage and the adopted main approaches are theoretical analysis and numerical simulation, but physical models are scarce. This leads to the yielded theories and methods are not sufficiently applicable for practical engineering application. Aiming at this, this paper focuses on developing effective methods of using wavelet and neural networks to detect the damage of elastic thin plate due to their extensive applications in civil engineering.
Authors: Dong Hai Xie, Hong Wei Tang, Rui Song Pan
Abstract: Two-dimensional elastic thin plates are widely used in civil engineering structures. The plates deteriorate gradually under service conditions, which influence the safety of engineering structures. How to identify the damage of the plate is one of the hot issues in the civil engineering fields. The relevant theoretical analysis and numerical simulation are stressed, but the physical model experiments are few. There are some problems among the theory, methods and practical engineering applications. A method is presented for determining damage location and degree of civil engineering structures based on model testing of two-dimensional steel plates.
Authors: Hong Wei Tang, Shi Bin Li
Abstract: Reinforced concrete (RC) structures taking full advantages of concrete and reinforcing steel bars are widely applied in civil engineering. Concrete bridges are subjected to alternate loads as well as static loads, much importance should be attached to their fatigue. Reinforced concrete beams are the elementary members of concrete bridges. Fatigue failure mode and fatigue life prediction of normal or high-strength RC beams were the research focus at home. The fatigue behavior of low-strength RC beams was studied through four-point bending fatigue test in the paper. The test results indicated that all beams fractured for concrete shear failure, which made the fatigue life of low-strength concrete beams drop greatly compared to that of normal or high-strength concrete beams, because the fatigue failure of normal or high-strength concrete beams were caused by the fracture of one or more reinforcing steel bars; the mid-span deflection development of low-strength RC beams had three phases, and the middle phase occupied about 90% of whole fatigue life, also in the second phase the mid-span deflection developed linearly with the increasing of cycle numbers. This research work provides necessary basis for the fatigue life deterioration of low-strength RC beams.
Authors: Shi Bin Li, Hong Wei Tang, Xin Wang
Abstract: Reinforced concrete (RC) structures are widely used in civil engineering for their merits. A good-quality concrete provides a highly alkaline environment that forms a passive film on reinforcement surface, preventing steel bars from corroding. Due to chloride attack or concrete carbonization, corrosion of embedded reinforcement in concrete members is common for RC structures. Much importance should be attached to the fatigue of corroded concrete bridges because they bear not only static loads but also alternate loads. Followed along with the aging of bridge structures, the increase of traffic volumes, the augment of vehicle loads as well as the deterioration of service environment, many corroded concrete bridges are urgently needed security appraisal and residual fatigue life forecast. Fatigue of corroded RC beams is a key problem for the existing corrosion-damaged concrete bridges. But the interrelated research was little. Based on the most new study information, the production on fatigue of corroded concrete beams was listed and analyzed, and the problems on fatigue of corroded concrete beams were indicated.
Authors: Hong Wei Tang, Shi Bin Li, Dong Hai Xie, Cimian Zhu
Abstract: Three corrosion degrees of reinforcement are chosen in this paper, which are considered to simulate minor, medium and severe degrees of corrosion in this field. A reinforcement mass loss about 5% is used to define a minor degree of corrosion, whereas mass losses about 10% and 20% are used to define medium and severe degree of corrosion, respectively. Fifteen specimens of the three corrosion degrees and seven uncorroded specimens are tested under fatigue. According to the results of the fatigue tests, using stress range as fatigue parameter and 50% as guaranteed probability, the fatigue S-N curves of the four different corrosion degrees of deformed reinforcement adaptable for fatigue reliability evaluation are put forward. These curves provide necessary principle for predicting the residual fatigue lives of aged existing reinforced concrete bridges.
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