地震作用下抗震与隔震连续梁桥动力响应试验研究

发布时间：2019-04-24 21:50

【摘要】：针对某跨海连续梁桥的抗震和隔震性能,通过将其简化,并根据相似比1∶10制作该梁桥单墩抗震与隔震试验模型,采用铅芯橡胶隔震支座,进行抗震及隔震地震模拟振动台试验,研究分别采用120、600、1 200和2 400年一遇地震波输入时结构的加速度响应、隔震支座剪力、墩顶剪力和隔震支座滞回性能,并根据单墩低周往复加载试验结果,判别在不同地震波作用时抗震桥墩和隔震桥墩所处的状态。试验结果显示:隔震后梁桥上部结构地震加速度响应在120和600年一遇地震时减小为抗震结构加速度响应的54%和55%;随着结构响应的增加,隔震位移越大,隔震支座耗能能力越强;采用隔震后,在2 400年一遇地震时,隔震梁桥整个桥墩在弹性范围内,桥墩地震响应小于开裂荷载,而抗震梁桥在600年一遇地震时,桥墩已达到开裂荷载。
[Abstract]:In view of the seismic and isolation performance of a continuous beam bridge across the sea, the seismic and isolation test model of the single pier of the bridge was made by simplifying the model and adopting lead rubber isolation bearing according to the similarity ratio of 1:10. The seismic and isolated seismic simulation shaking table tests are carried out. The acceleration response of the structure, the shear force of isolated support, the shear at pier top and the hysteretic performance of isolated bearing are studied when the seismic wave is input to 120,600,1,200 and 2 400 years, respectively. Based on the test results of low cyclic loading of single pier, the states of seismic pier and isolated pier under different seismic waves are identified. The experimental results show that the seismic acceleration response of the superstructure of the beam bridge decreases to 54% and 55% of that of the seismic structure after 120 and 600 years of earthquake. With the increase of the structural response, the greater the isolation displacement is, the stronger the energy dissipation capacity of the isolation bearing is. After the seismic isolation, the whole pier of the isolated beam bridge is in the elastic range, and the seismic response of the pier is less than the cracking load. However, when the earthquake happens once in 600 years, the pier of the seismic beam bridge has reached the cracking load.
【作者单位】：广州大学减震控制与结构安全国家重点实验室(培育);
【基金】：国家自然科学基金重点项目资助(U1334209);国家自然科学基金资助项目(51478131;51408142) 国家重点基础研究发展计划资助项目(2011CB013606) 广州市珠江科技新星专项项目资助(2014J2200058)
【分类号】：U442.55

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