大型渡槽结构抗震及隔震研究
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摘要
南水北调水利工程是为缓解我国西北及华北地区水资源缺乏而将兴建的大型水利工程,现已列入我国“十五”发展计划,其中大型渡槽作为跨越河流等的输水建筑物在南水北调水利工程中占有重要地位。确保大型渡槽在地震作用下的抗震安全性,有着重要意义。根据设计部门提供的设计方案,本文采用空间梁单元、板壳单元建立渡槽结构的有限元模型,利用ANSYS程序,对南水北调中线工程的洺河渡槽进行分析研究。本文分4种工况(槽内无水、中槽过水、边槽过水和三槽都过水)对该大型渡槽结构的动态特性进行分析,所得结果可为大型渡槽结构抗震设计提供依据;并在EL-Centro地震波激振下进行渡槽结构在这四种工况下的地震动力时程分析,计算给出了大型渡槽结构的地震反应规律;为了避免较大应力的出现对渡槽结构造成破坏,本文采取隔震措施来减小该结构的动力反应,并分析其隔震效果,提供设计参数,为工程设计提供依据。结果表明:隔震体系具有明显的减震效果,它大大降低了地震作用下结构的峰值反应,有效地消耗了地震能量。最后,提出了大型渡槽结构的一些设计建议及有待进一步解决的问题。
The large water conservancy engineering transporting water from south to north will relieve the lack of water resource of North-West and North-China regions. It has been wrote into "Tenth Five-year Plan" of China. As a building spanning rivers to transport water, large-scale aqueduct plays an important role in this water conservancy engineering. It is important to ensure the seismic-resistance security of large-scale aqueduct under earthquake load. In this paper, based on the tentative design of design department, using space beam element and plate and shell element, the finite element model of aqueduct is built. Aqueduct of Ming-he in the middle of the engineering is analyzed by ANSYS finite element program. The dynamic characteristic of large-scale aqueduct is analyzed under four cases (aqueduct without water, aqueduct with water in three troughs, aqueduct with water in the middle trough, aqueduct with water in side troughs), and the results can be applied to seismic-resistance design of large-sc
    ale aqueduct. The earthquake time history response of large-scale aqueduct is studied under four cases when the EL-Centro earthquake wave is inputted. In the paper, base isolation technology is applied to avoid the destroy arising from the bigger stress in aqueduct. The results provide design parameters for engineering design. Analysis results indicate that base isolation technology has obviously seismic isolating effect, and decreases maximum response of structure sharply when earthquake occurs, and isolates seismic energy effectively. Based on the analysis, some suggestion for engineering design of aqueduct is given, and the problems that need to be further studied are presented.
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