行波效应下对称多跨大跨结构的随机地震响应研究

发布时间：2018-02-26 17:01

本文关键词： 行波效应多跨大跨结构虚拟激励法柱顶相对位移不同支承形式　出处：《振动与冲击》2016年20期 　论文类型：期刊论文

【摘要】：为了研究行波效应对于多跨大跨结构随机地震响应的影响机理,首先以两跨结构简化模型为研究对象,选取柱顶相对位移作为计算响应量,采用多点虚拟激励法对结构的响应功率谱公式进行推导,求得结构响应极值随行波频率的变化规律,最后将此方法拓展至多跨结构,分析不同跨数以及不同支承形式对于多点激励下结构地震响应的变化规律。计算结果表明:受拟静力响应影响,多跨结构中柱柱顶相对位移受行波效应影响更加显著,在大跨结构抗震设计中应该引起重视;随着跨数增加结构响应极值并没有明显提升,但不同支承形式可能导致结构受多点激励效应影响不同,针对具体的支承形式结构进行具体分析是必要的。
[Abstract]:In order to study the influence mechanism of traveling wave effect on the random seismic response of multi-span long-span structure, the simplified two-span structure model is first studied, and the column top relative displacement is selected as the calculation response. The multipoint virtual excitation method is used to deduce the response power spectrum formula of the structure, and the variation law of the frequency of the structure's response extremum with the traveling wave is obtained. Finally, the method is extended to the multi-span structure. The variation law of seismic response of structures subjected to multi-point excitation by different span numbers and different supporting forms is analyzed. The results show that the relative displacement of column top in multi-span structures is affected more significantly by traveling wave effect, which is affected by quasi-static response. In the seismic design of long-span structures, attention should be paid to the maximum value of structural response with the increase of span number, but different supporting forms may lead to different effects of multi-point excitation on the structure. It is necessary to analyze the concrete supporting structure.
【作者单位】：天津大学建筑工程学院;清华大学土木工程系土木工程安全与耐久性教育部重点实验室;
【基金】：国家自然科学基金重点项目(51038006) 高等学校博士学科点专项基金资助课题(20090002110045)
【分类号】：TU311.3

【相似文献】