沈阳锦兆园大厦二期深基坑地震反应研究

发布时间：2018-09-04 10:37

【摘要】：我国是世界上的地震多发国家之一,随着我国大型深基坑工程日益增多,对于基坑受动载方面的影响,已逐步引起关注。论文在查阅大量文献的基础上,以沈阳锦兆园大厦二期深基坑工程为例,对紧邻高层建筑物开挖的深基坑工程进行了基于FLAC3D的地震反应分析。论文应用SeismoSignal软件,在依照《建筑抗震设计规范》的基础上,对原始输入波形进行了处理,以使用于动力分析的地震波满足模型的网格尺寸要求及抗震烈度为7度场地的多遇地震加速度峰值要求,得到了人工地震波形的基本参数属性。通过ANSYS与FLAC3D联合建模技术建立算例实体模型,进行了重力场作用下紧邻高层建筑深基坑的静力模拟,讨论了重力场作用下模型及支护结构的沉降、位移及内力的变化规律。对于预应力锚索预应力损失的情况,讨论了锚索预应力损失的原因,生成了用于动力分析的初始应力场。论文在静力计算结果的基础上进行了地震荷载时程分析,并对动力载荷作用时间内模型每秒的动力响应规律进行了量化研究。得出了7度场地,对应于规范规定多遇地震加速度峰值的折减Kobe地震波作用下,锦兆园大厦二期深基坑地震响应规律,通过对不同材料、不同土层监测点的响应谱分析,总结出不同材料在相同地震波作用下的动力响应不同。讨论了模型塑性区发育的机理。研究了桩锚支护体系的位移响应规律以及锚索的轴力、水泥浆剪应力响应规律。得到了地震作用下基础底板、桩体、锚索、土层等位移规律。
[Abstract]:China is one of the earthquake-prone countries in the world. With the increasing number of large-scale deep foundation pit projects in China, the impact of foundation pit on dynamic load has gradually attracted attention. On the basis of consulting a lot of documents, taking the second phase deep foundation pit project of Jinzhuoyuan Building in Shenyang as an example, the seismic response analysis of deep foundation pit engineering adjacent to high-rise building is carried out based on FLAC3D. Based on the Code for Seismic Design of buildings, the original input waveform is processed by using SeismoSignal software. The basic parameter attributes of the artificial seismic waveform are obtained by using the seismic waves used in dynamic analysis to meet the requirements of the mesh size of the model and the peak value of the frequent earthquake acceleration in a site with a seismic intensity of 7 degrees. Based on the ANSYS and FLAC3D modeling technology, this paper establishes an example solid model, carries out the static simulation of the deep foundation pit adjacent to the high-rise building under the action of gravity field, and discusses the variation law of the settlement, displacement and internal force of the supporting structure and the model under the gravity field. For the case of prestressing loss of prestressed anchor cable, the reason of prestressing loss of anchor cable is discussed, and the initial stress field for dynamic analysis is generated. Based on the static calculation results, the seismic load time history analysis is carried out, and the dynamic response law of the model in the time of dynamic load action is quantitatively studied. A 7 degree site is obtained, which corresponds to the seismic response law of the second phase deep foundation pit of Jin Zhaoyuan Tower under the action of the reduced Kobe seismic wave of the peak earthquake acceleration peak in the code. Through the analysis of the response spectrum of different materials and different soil monitoring points, It is concluded that the dynamic response of different materials under the same seismic wave is different. The mechanism of plastic zone development in the model is discussed. The displacement response law of pile-anchor support system, the axial force of anchor cable and the shear stress response of cement slurry are studied. The displacement rules of foundation floor, pile, anchor cable and soil layer are obtained.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU435

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