CAJ | 학술논문

按1／20的几何比例制作一典型人字曲线桥梁模型，进行了多维振动台试验，并针对试验模型建立数值分析模型，研究人字曲线桥梁在多维地震作用下的地震响应特点。结果表明，竖向地震分量对桥墩顶纵桥向加速度、主梁分支处两桥墩横桥向相对位移和墩底纵桥向弯矩基本无影响，结构响应与输入地震波的频谱特性和结构形式有关；单向激励下，墩顶纵桥向加速度、分支处桥墩横桥向相对位移和墩底纵桥向弯矩响应都为最大；双向和三向激励都使墩顶纵桥向加速度响应降低，且降低幅度随着墩与直梁正向角度的增加而增加；主梁与分支直梁应设置的初始间隙应大于主梁与分支曲梁。
안1／20적궤하비례제작일전형인자곡선교량모형，진행료다유진동태시험，병침대시험모형건립수치분석모형，연구인자곡선교량재다유지진작용하적지진향응특점。결과표명，수향지진분량대교돈정종교향가속도、주량분지처량교돈횡교향상대위이화돈저종교향만구기본무영향，결구향응여수입지진파적빈보특성화결구형식유관；단향격려하，돈정종교향가속도、분지처교돈횡교향상대위이화돈저종교향만구향응도위최대；쌍향화삼향격려도사돈정종교향가속도향응강저，차강저폭도수착돈여직량정향각도적증가이증가；주량여분지직량응설치적초시간극응대우주량여분지곡량。
A scale 1 /20 model of a typical Y-shaped curve bridge was made and its multi-dimensional shaking table tests were conducted.Its numerical analysis model was established,the seismic response characteristics of the Y-shaped curve bridge under multi-dimensional seismic excitation were studied.The results showed that the vertical seismic input has no effects on the vertical seismic input has no effects on the longitudinal acceleration at the pier top,the transverse relative displacement between two piers at the branch of the main beam and the longitudinal bending moment at the pier bottom, the structural response is related to the input seismic spectrum and structure form;the three ones mentioned above reach the maximum under unidirectional excitations;the longitudinal acceleration at the pier top drops under bidirectional excitations and three-dimensional excitations,and the reduction level increases with increase in the angle between pier and straight beam;the initial gap between the main beam and the branch straight beam should be larger than that between the main beam and the branch curve beam.