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为明确地震作用下城市高架曲线桥上部梁体位移响应规律,基于ANSYS软件有限元分析,开展了不同水平、不同类型地震作用下上部梁体位移对比研究。研究表明:地震作用下曲线梁桥上部梁体主要表现为切向位移,罕遇地震作用下最大切向位移较最大径向位移增加约1.45倍,出现在端跨桥台位置,该位置应加设纵桥向防落梁装置;最大径向位移出现在中跨位置,应加设横桥向防落梁装置,多遇地震作用下无需加设防落梁装置。罕遇地震作用下,每联桥梁中部墩底截面曲率易超出屈服曲率值而进入塑性,选取的日本海中部T1-111-1地震波振动频率大,各点地震强度强烈,墩底滞回曲线密集。地震作用下曲线梁桥结构上部梁体位移响应规律研究有助于分析地震作用下曲线梁桥结构的损伤特点,在明确城市高架曲线桥防落梁装置研究方面具有重要作用。
In order to clarify the displacement response law of the upper girder under the urban elevated curve bridge under earthquake, the displacement of the upper girder body under different levels and different types of earthquakes is studied based on ANSYS finite element analysis. The results show that the upper beam body of curved beam bridge under earthquake mainly shows tangential displacement, and the maximum tangential displacement under rare earthquakes increases about 1.45 times than the maximum radial displacement, which appears at the position of end span abutment, which should be added Set the longitudinal bridge to the anti-shedding beam device; the maximum radial displacement occurs in the position of the midspan, should be added to the cross-bridge to the anti-shedding beam device, under the action of any earthquake without adding anti-shedding beam device. Under rare earthquakes, the curvature of pier bottom section in each bridge reaches the plasticity easily beyond the yield curvature, and the frequency of T1-111-1 seismic waves in the central part of Japan Sea is large. The seismic intensity is strong at each point and the hysteresis curve at the pier bottom is intensive . The study of displacement response law of curved beam bridge under the action of earthquake is helpful to analyze the damage characteristics of curved beam bridge under earthquake action and plays an important role in the research of anti-dropping beam device of urban elevated curve bridge.