【作者】 朱翔；

【导师】 杜永峰；

【作者基本信息】 兰州理工大学 ， 结构工程， 2012， 硕士

【摘要】 隔震作为一种有效的减震手段在一些大震中表现出良好的性能，已经越来越多地应用于实际工程中。人们希望隔震结构能应用于强震区附近，发挥其良好的减震性能是很自然的想法。可是，近年来全世界范围内接连发生了多次大地震，对在强震区附近隔震结构等长周期结构的抗震性能带来了不利影响。同时，在近断层附近对于平面不规则隔震结构的扭转反应也不容忽视。因此，研究平面不规则隔震结构与非隔震结构在近场地震作用下的倒塌分析就显得十分必要。本文首先分析了平面不规则基础隔震结构在近场地震作用下的抗震性能，并对其进行了倒塌过程模拟。从1984年新西兰建造世界上第一幢以铅芯叠层橡胶垫作为隔震元件的4层建筑物到现在，国内外已经建造了大量的基础隔震结构，其安全性也得到了广泛的关注。由于基础隔震结构的自振周期较长，所以近场地震动对基础隔震结构的抗震性能有不利的影响。运用MSC.MARC建立平面不规则基础隔震结构和非隔震结构模型，选择不同的地震动作为输入进行非线性仿真分析。研究表明：近场地震作用下平面不规则基础隔震结构的扭转效应相对于非隔震结构的扭转效应明显减小。同时，倒塌模拟表明，平面不规则的非隔震结构较基础隔震结构容易倒塌。同时本文研究了近场地震作用下平面不规则串联隔震结构的动力响应和倒塌过程特性。串联隔震结构现在在国内外都比较常见，其安全性得到了广泛的关注。而且串联隔震结构的自振周期也较长，所以近场地震动对串联隔震结构的抗震性能有不利的影响。因此，本文分析了平面不规则串联隔震结构在近场地震作用下的抗震性能，并对其进行了倒塌过程模拟。通过建立倒塌分析动力方程，使非线性仿真分析的解答精度得以保证。以此建立平面不规则串联隔震结构和非隔震结构模型，选择不同的近场地震动作为输入进行非线性仿真分析。通过比较近场地震作用下平面不规则串联隔震结构与非隔震结构的动力响应，并总结其规律；对隔震与非隔震结构建立倒塌模型，分析两种结构的抗倒塌能力。研究表明：近场地震作用下平面不规则串联隔震结构的扭转效应相对于非隔震结构的扭转效应明显减小。倒塌模拟表明，在近场地震作用下平面不规则非隔震结构出现倒塌时，串联隔震结构未出现倒塌，说明隔震结构更加安全。更多还原

【Abstract】 Isolation as an effective means of shock absorption in some of the earthquake toshow good performance and has been increasingly applied to practical engineering. Itis hoped that the isolated structure can be applied to near the earthquake zone. That’svery natural idea. However, in recent year’s worldwide scope for there were many bigearthquakes. It had a negative impact on long-period structures and isolated structuresseismic performance in near the earthquake zone. Meanwhile, in the vicinity ofnear-fault for the torsonal response of plane irregular base-isolated structure can notbe ignored. Therefore, it is very necessary that this paper study the analysis of thecollapse of the plane irregular isolated structures and non-isolated structuressubjected to near-fault seismic motion.The paper firstly analyzes earthquake resistant behaviour and the collapsedprocess simulation of base-isolated structures subjected to near-fault seismic motion.In1984New Zealand had already built the first lead laminated rubber pad core asisolation of components of the four building in the world. From then to now thesekind of base-isolated structures are now more common at home and abroad. Its safetyhas also been widespread concern. As the base-isolated structures of the naturalperiod is long, so the near-fault seismic motion on the seismic performance ofbase-isolated structures have an adverse effect. Plane irregular base-isolated structuremodel and non-isolated structure model are established based on MSC.MARC. Tochoose different near-fault seismic motions as input analyze non-linear simulation ofthese two structures. Results show that plane irregular base-isolated structure’storsion effect subjected to near-fault seismic motion relative to the non-isolatedstructure’s torsion effect obvious decrease. Meanwhile, the collapse simulation showthat plane irregular non-isolated structure is easier to collapse than plane irregularbase-isolated structure.What’s more, the paper also studies the dynamic response and the collapsedprocess characteristics of serial isolation structures subjected to near-fault seismicmotion. These kind of serial isolation structures are now more common at home andabroad. Its safety has been widespread concern. And the serial isolation structures ofthe natural period are long, so the near-fault seismic motion on the seismicperformance of serial isolation structures has an adverse effect. Therefore, the paperanalyse earthquake resistant behaviour and the collapsed process simulation of theplane irregular serial isolation structures subjected to near-fault seismic motion. Thesimulation analysis of nonlinear solution accuracy can be guaranteed through the establishment of collapse analysis of dynamic equation. Plane irregular serialisolation structures model and non-isolated structure model are established based onthe dynamic equation. To choose different near-fault seismic motions as input analyzenon-linear simulation of these two structures. Comparing the dynamic response ofplane irregular serial isolation structure and non-isolated structure subjected tonear-fault seismic motion，and sum up the law. Building isolation and non-isolatedstructure collapsed model analyze to resist collapsed ability of these two structures.Results show that plane irregular serial isolation structure’s torsion effect subjected tonear-fault seismic motion relative to the non-isolated structure’s torsion effectobvious decrease. Meanwhile, the collapse simulation shows that plane irregularserial isolation structure doesn’t collapse when plane irregular non-isolated structurecollapse. This shows the isolation structure is more secure.更多还原