钢筋混凝土简支梁超载后动力特性试验研究

基于采用动态法评估桥梁结构构件超载后损伤的目的,设计和开展了试验研究和相应理论分析。通过对钢筋混凝土简支梁进行反复超载试验,测出构件从完整到破损,以及不同超载幅值和次数对应损伤状态下的频率和阻尼比等模态参数,考查了其与构件承载力的关系,为采用结构动力参数评估结构损伤分析了频率和阻尼比随损伤状态不同的变化规律,根据试验结果得到频率和荷载等级关系的经验公式,为采用动态法评估既有桥梁提供了理论依据

Dynamic Loading Experimental Investigation on Reinforced Concrete Beams Considering the Influence of Overload

Recently, the research on non-destructive damage detection receives more and more recognition, and the damage caused by overload becomes a new problem for highway bridge . In order to evaluate the influence of overload on bridge members by using dynamic modulus, the authors design and develop an experimental investigation. Based on the dynamic loading experiment of simply supported beam, the influence of overload on reinforced concrete beams is studied. The changed parameters are over load value and number. Modal parameters such as frequency, damping ratio are identified from initial state to damaged state. The change rule of above modal parameters is obtained. The regress expressions of frequency is given based on the test result. The analytical and experimental results can be used for quantitative dynamic evaluation of reinforced concrete beam after damage.