【作者】 王福智；

【导师】 王依群；

【作者基本信息】 天津大学 ， 港口、海岸及近海工程， 2004， 硕士

【摘要】 随着现代建筑高度的不断增加,混合结构体系正在被逐步广泛的应用。但是目前国内对于钢框架-混凝土筒体混合结构的抗震研究的较少。由于混合结构是由两种完全不同的材料组成的结构体系,两种材料的阻尼比差别比较大,而实际工程设计中经常采用规范中的折算阻尼比的方法,折算阻尼比介于两种材料的阻尼比之间,这种方法是一种近似方法,其计算结果如应用于设计,与采用不同材料不同阻尼比的计算结果相比,有一定的差别。目前在这种混合结构日益普及的情况下,理论上对于材料阻尼差别对高层建筑反应影响的研究进行的很少。如果这种影响不加以重视,有时会形成很大的安全隐患,严重的会威胁到居民的生命、财产的安全。本论文首先用SATWE对一个实际钢框架-混凝土筒体工程进行建模,然后在SATWE中在不同的地震作用下对采用不同折算阻尼比的三维立体模型进行弹性时程动力分析。本论文主要的研究内容是通过对上述工程实例用较精确的阻尼模型即钢框架和混凝土核心筒部分采用各自的阻尼比进行平面结构弹性时程计算,然后再对同一工程采用不同的折算阻尼比进行平面结构弹性时程计算,通过与较精确阻尼模型内力、位移结果的比较,判断折算阻尼比取值对计算结果的准确性的影响。最后对本结构折算阻尼比设计取值给出了建议。更多还原

【Abstract】 The use of hybrid structural system, which is composed of steelframes and concrete core-tube, is becoming more and more extensive inmodern buildings with the increasing structure height. However, theaseismic behavior of the hybrid structure system has not beencomprehensively studied. Additionally, the damping ratio of steel andconcrete differ greatly from each other. In practical structural designs,effective damping ratio is often used, the value of this ratio varies fromthe two materials’damping ratio. It’s a approximate way by usingeffective damping ratio, the results of this method are not precision. Thestudy of influence of different material damping ratio to hybrid structuresystem is not thorough, while that system is increasingly popular. It’ssure that there’s some difference from the results of those two method.sometimes, those difference maybe a threat to structure’s security orresident’s safety.A three-dimensional model of steel frames and concrete core-tubestructure project is established by using SATWE, then the elastic timehistory analysis of that model is used under different earthquake function.In this paper, the previous model is selected in calculating thedifference of the two different damping models by using planar elasticdynamic time history analysis, that considering different materialdamping ratio and effective damping ratio. According to compare ofinternal force and displacement, the influence of damping ratio value tocalculating results estimated. thus, the precision and feasibility of usingeffective damping ratio can be tested. At last, suggestions of suitableeffective damping ratio of that structure is put forward.更多还原