钢-混凝土组合梁在简谐荷载下的动力响应试验研究

Experimental Research on Dynamic Responses of Steel-Concrete Composite Beams under Harmonic Load

为了研究钢-混凝土组合梁在强迫振动下的动力响应,以剪力连接度为参数,设3片钢-混凝土组合箱梁,进行了不同静载分量、加载幅值和频率的简谐荷载下的动力试验研究,得到了跨中动挠度、跨中加速度和结合面滑移随剪力连接度及简谐荷载特性的变化规律。试验结果表明:组合梁结合面的滑移均值和幅值、跨中加速度、以及跨中动挠度时程在简谐荷载下均表现为随时间变化的波动形式,且均随剪力连接度的降低而增大;组合梁跨中动挠度和结合面滑移均值主要受静态荷载分量影响,滑移幅值主要受加载幅值影响,而跨中加速度则受荷载频率和荷载幅值的影响较大。

In order to research the dynamic response of the steel-concrete composite beam under forced oscillation, taking the shear connection degree as parameter, three steel-concrete composite box beams were designed and conducted dynamic experimental researches under harmonic load with different static loading components, loading amplitudes, and loading frequencies. The variation laws of mid-span dynamic deflection, mid-span acceleration and joint slip with shear connection and harmonic load characteristics were obtained. The results indicate that, the mean slip value and the slip amplitude at the surface between the steel girder and concrete slab, and the mid-span acceleration and dynamic deflection show a sine wave shape under the sine harmonic load, which increase with the decrease of shear connection degree. The mid-span dynamic deflection and mean value of the ship are mainly affected by static load weight. The slip amplitude is mainly affected by loading amplitude, while mid-span acceleration is greatly influenced by the load frequency and load amplitude.