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Experimental Investigation on Low-Velocity Impact Response and residual Compressive bearing capacity of Composite Stringers

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Transactions of Nanjing University of Aeronautics and Astronautics 2020年第4期37卷 655-662页

作者： CHEN Fang YAO Weixing WU Fuqiang State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China

Three types of composite stringers were impacted from two different *** between impact energy and visible defect length were *** critical impact energy corresponding to barely visible impact damage(BVID)of each stringer was *** with BVID were then compressed to obtain the residual *** results showed that for all types of stringers,the critical energy of in-plane impact is always much lower than out-plane ***-plane impact causes much more decrement of stringers'bearing capacity than outplane *** both impact directions,I-stringers own the highest defect detectability,T-stringers come ***,I-stringers own the better residual strength ratio than I-stringers and *** considering impact defect detectability and residual bearing capacity after impact,T-stringers own the best compression-afterimpact(CAI)behaviors.

关键词： composite stringer low-velocity impact defect compression after impact residual bearing capacity

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An Rapid Assessment Method for bearing capacity of RC Girder Bridges Based on residual Strain

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Open Journal of Civil Engineering 2024年第2期14卷 225-239页

作者： Ming Zhong China Communications Infrastructure Maintenance Group Beijing China

In order to realize the in-situ evaluation of reinforced concrete bridges subjected to fatigue for a long time or after earthquake, an evaluation method for cumulative damage of concrete structures based on unloading elastic modulus was proposed. First, according to the concrete stress-strain curve and the statistical relationship between residual strain and cumulative strain, the calculation method of static equivalent strain and residual strain concrete based on unloading elastic modulus and the method for estimating the strength of concrete after damage were proposed. The detailed steps of field test and analysis and the practical damage indicators of residual strain were given. Then, the evaluation method of existing stress and strain of Reinforced Concrete Bridge under dead load and the concept of “equivalent dead load bending moment” were put forward. On this basis, the paper analyzed the root cause of the decrease of bearing capacity of Reinforced Concrete Bridge after fatigue damage, and pointed out that the equivalent strain or residual strain of reinforced concrete increases under the fatigue effect, which led to the decreasing of actual live moment and deformation performance while the ultimate load-carrying capacity remained constant or very little decrease. The evaluation method of structure residual capacity was given, and through comparative analysis of eight T reinforced concrete beams that had been in service for 35 years with the static failure tests, the effectiveness of the method was verified.

关键词： Bridge Engineering Reinforced Concrete Fatigue Damage Unloading Elastic Modulus residual Strain residual bearing capacity

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