为研究梁拱协作体系相较于传统单一型桥梁结构其抗震性能的优越性,以某三跨梁拱协作体系桥梁为工程背景,利用midas Civil建立该工程桥梁有限元数值分析模型,并建立同尺寸拱桥及简支梁模型,开展对比分析,研究不同工况下的静力特性,为进一步研究桥梁结构的动力特性,对结构输入典型的EL Centro Site波,分析桥梁结构在不同方向上的地震动响应,进而开展结构抗震性能分析.结果表明,对比单一型桥梁,在自重情况下,梁拱协作体系比传统梁桥位移响应减少95%,比传统拱桥减少93%,有效减少桥梁结构在静力荷载下的位移响应,其耐久性和安全性更加优秀.在结构模态分析中,梁拱协作体系桥梁频率最大,周期最小,结构刚度与抗扭刚度高于传统单一型桥梁.在同等地震波的作用下,梁拱协作体系桥梁波动区间均处于拱桥与梁桥之间,其结构抗震性能较传统单一型桥梁最强.
SEISMIC PERFORMANCE ANALYSIS OF BRIDGE STRUCTURE WITH BEAM-ARCH COLLABORATION SYSTEM
In order to study the seismic performance superiority of the beam-arch cooperative system com-pared with the traditional single-type bridge structure,this paper takes a three-span beam-arch cooperative system bridge as the engineering background,uses midas Civil to establish the finite element numerical analysis model of the bridge,and establishes the arch bridge of the same size and simply supported beam model,carries out compar-ative analysis,and studies the static characteristics under different working conditions.In order to further study the dynamic characteristics of the bridge structure,the typical EL Centro Site wave is injected into the structure to ana-lyze the ground motion response of the bridge structure in different directions,and then the seismic performance of the structure is analyzed.The results show that,compared with the single type bridge,the displacement response of the beam arch coordination system is 95%less than that of the traditional beam bridge and 93%less than that of the traditional arch bridge under self-weight,which effectively reduces the displacement response of the bridge structure under static load,and its durability and safety are more excellent.In the structural modal analysis,the structural stiff-ness and torsional stiffness of the bridge with beam-arch coordination system are higher than that of the traditional single-type bridge.Under the action of the same seismic wave,the fluctuation range of the bridge is between the arch bridge and the beam bridge,and its structural seismic performance is stronger than that of the traditional single type bridge.
万方数据
维普
