复杂立交时程分析地震输入的选择和人工合成

发布时间：2018-03-26 15:06

本文选题：立交桥梁　切入点：时程分析法　出处：《广西大学学报(自然科学版)》2014年04期

【摘要】：针对时程分析法进行结构抗震研究时输入地震波的选择和设计问题,研究了复杂立交中桥梁结构应用时程分析进行抗震设防时地震输入的选择和人工合成。对复杂立交桥梁提出"2组"+"1组",且任意两组间同方向时程相关系数的绝对值小于0.1的输入地震波选择原则;建立了一种规范化的拟场地人工地震波的合成方法,并根据提出的数学模型编制了相应的计算程序。以某立交枢纽工程中的一座长曲线匝道桥梁结构为例,进行了地震输入的选择和人工合成。结果表明:所提出的"通过规范设计反应谱的幅频特性和拟建场地天然地震动的相频特性"人工合成的地震波,既含有天然地震记录所具有的频域非平稳特性,又符合现行公路桥梁抗震设计规范中设计反应谱的规定,是一种更为真实、规范的人工地震输入合成方法,值得推荐使用。
[Abstract]:The selection and design of input seismic waves in seismic research of structures by time-history analysis are discussed. In this paper, the selection and artificial synthesis of seismic input for seismic fortification of bridge structure in complex interchange are studied. Two groups "1 group" of complex overpass beam are proposed, and the correlation coefficient of time history between any two groups in the same direction is absolute. The selection principle of input seismic wave with a value less than 0.1; A standardized synthetic method of artificial seismic waves in pseudo-site is established, and the corresponding calculation program is compiled according to the proposed mathematical model. The bridge structure of a long curve ramp in an interchange project is taken as an example. The selection and artificial synthesis of seismic input have been carried out. The results show that the synthetic seismic wave is composed of "amplitude-frequency characteristics of the design response spectrum and phase frequency characteristics of natural ground motion of the proposed site". It not only contains the non-stationary characteristics of natural seismic records in frequency domain, but also accords with the design response spectrum of the current code for seismic design of highway bridges. It is a more real and standard synthetic method of artificial earthquake input, which is worthy of recommendation.
【作者单位】：西安建筑科技大学土木工程学院;国家林业局西北林业调查规划设计院;
【基金】：国家自然科学基金资助项目(51078306) 陕西省自然科学基础研究计划资助项目(2013JQ7007) 西安建筑科技大学基础研究基金(JC1203) 陕西省重点学科建设专项资金(E01004)
【分类号】：U448.17;U442.55

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