曲线梁桥地震响应分析与减隔震研究

发布时间：2018-03-23 07:18

本文选题：曲线梁桥　切入点：地震响应　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：曲线梁梁桥由于对复杂地形地貌的良好适用性，满足路线整体线形的连续性，具有平顺、流畅的线条，已在国内外城市立交和城市高架桥中得到了广泛应用。从1971年美国San Fernando地震中两座大型互通立交工程中多跨曲线梁桥垮塌之后，许多学者开始关注曲线桥抗震问题，至今曲线桥抗震研究已经取得了较大进展。本文以西安市某立交辅道桥为工程背景，，在以往学者研究的基础上，对预应力混凝土连续曲线梁桥进行了反应谱分析和非线性时程分析，并研究了减隔震措施对结构位移和内力响应的影响。本文的主要工作包括：（1）利用结构分析软件MIDAS/Civil建立桥梁空间有限元模型，分析了实例桥的动力特性；（2）分别采用反应谱和时程分析法按最不利地震波输入角度对桥梁结构进行了E1和E2地震作用下的，并对两种分析方法的结果做了详细比较；（3）总结了桥梁常用减隔震装置的力学特点和数值模拟方法，并运用非线性时程分析方法研究减隔震橡胶支座对曲线桥结构内力和位移响应的影响。本文分析结果表明：曲线梁桥纵横向振动存在耦合现象，曲线桥地震响应分析应考虑多向地震作用；在E1地震作用下，反应谱分析所得墩柱轴力比时程分析求得的值要小，弯矩、剪力值一般要比时程分析得到的值大，总体而言，反应谱方法是偏不利的；时程分析可以得到任一时刻的结构响应，且分析结果能够较好的反映实际；采用高阻尼隔震橡胶支座极大的耗散了地震能量，使纵横向墩底最大弯矩、最大剪力隔振率有较大的隔震率，并能有效减小墩顶顺桥向位移。
[Abstract]:Because of its good applicability to complex topography and geomorphology, curved girder bridge satisfies the continuity of the overall line of the route, and has smooth and smooth lines. It has been widely used in urban interchange and viaduct at home and abroad. Since the collapse of multi-span curved beam bridge in the San Fernando earthquake in 1971, many scholars have begun to pay attention to the seismic problem of curved bridge. So far, great progress has been made in the seismic research of curved bridges. In this paper, based on the engineering background of an interchange highway bridge in Xi'an, and on the basis of previous scholars' research, The response spectrum analysis and nonlinear time history analysis of prestressed concrete continuous curved beam bridge are carried out, and the effects of seismic isolation measures on the structural displacement and internal force response are studied. The main work of this paper is as follows:. 1) the spatial finite element model of the bridge is established by using the structure analysis software MIDAS/Civil, and the dynamic characteristics of the bridge are analyzed. (2) under the action of E1 and E2 earthquake, the bridge structure is analyzed by response spectrum and time history analysis according to the most unfavorable seismic wave input angle, and the results of the two analysis methods are compared in detail. (3) the mechanical characteristics and numerical simulation methods of the commonly used isolation devices for bridges are summarized, and the influence of rubber bearings on the internal force and displacement response of curved bridges is studied by using nonlinear time-history analysis method. The results show that there exists coupling phenomenon in longitudinal and transverse vibration of curved girder bridges, the seismic response of curved bridges should be analyzed by multi-direction earthquakes, and the axial forces of pier columns obtained by response spectrum analysis are smaller than those obtained by time-history analysis under E1 earthquake. Generally, the value of moment and shear force is larger than that obtained by time-history analysis, in general, the response spectrum method is unfavorable, and the structural response at any time can be obtained by time-history analysis, and the results of analysis can better reflect the actual situation. The seismic energy is greatly dissipated by using the rubber bearing with high damping. The maximum bending moment and the maximum shear isolation rate at the bottom of the longitudinal and transverse piers are greatly isolated, and the displacement of the pier top along the bridge can be effectively reduced.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U442.55

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