框架式曲线梁桥铰接构造地震反应研究分析

发布时间：2018-10-07 19:39

【摘要】：该文针对框架式曲线梁桥铰接构造的地震反应进行分析研究,以美国强震带的一实际桥梁为例,通过Open Sees平台建立全桥三维模型并精细模拟铰接点的咬合构造和限位装置,采用时程分析获得铰接构造内的易损伤位置、损伤过程及地震激励角度对铰接点地震反应的影响。研究结果表明:框架式曲线梁桥铰接构造内的纵向限位钢筋,横向受压支撑垫是抗震薄弱构件;铰接构造内纵向限位钢筋的锚固区混凝土以及咬合位置受拉区混凝土在地震中容易产生开裂破坏;非对称框架式曲线梁桥不同铰接点地震反应相差很大,墩高对称布置会令该差值减小;纵桥向地震激励下,铰接点纵向限位装置损伤较大,咬合区域竖向地震反应较大,但这一地震激励会均化不同铰接点处横向限位装置的损伤程度;横桥向地震激励下,铰接点横向限位装置损伤较大,咬合区域横向地震反应较大,但这一地震激励会均化不同铰接点处纵向限位装置的损伤程度。
[Abstract]:In this paper, the seismic response of hinged frame curved girder bridges is analyzed and studied. Taking a practical bridge in a strong earthquake belt in the United States as an example, a three-dimensional model of the whole bridge is established through Open Sees platform, and the occlusal structure and limiting device of hinged points are simulated finely. Time history analysis is used to obtain the influence of the vulnerable location, damage process and seismic excitation angle on the seismic response of hinged joints. The results show that the longitudinal limited reinforcement in the hinged frame curved girder bridge and the transverse compression bracing pad are the weak seismic components. The concrete in anchoring zone of longitudinal limited steel bar in hinged structure and the concrete in tension zone in bite position are apt to crack and destroy in earthquake, and the seismic response of different hinge points of asymmetric frame type curved girder bridge is very different. The high symmetry arrangement of piers will reduce the difference. Under the longitudinal bridge earthquake excitation, the longitudinal limit device of hinged point will be damaged greatly, and the vertical seismic response of the bite area will be larger. But this seismic excitation will homogenize the damage degree of the lateral limit device at different hinge points, and under the transverse bridge seismic excitation, the transverse limit device of the hinge point will be damaged greatly, and the lateral seismic response of the bite area will be greater. But the earthquake excitation will homogenize the damage degree of the longitudinal limiter at different hinge points.
【作者单位】：东北林业大学土木工程学院;辽宁省交通规划设计院;
【基金】：国家自然科学基金项目(50908005,51178008) 美国加州交通局项目
【分类号】：U442.55

【参考文献】