煤矿采动损伤建筑物地震动力响应分析

发布时间：2018-04-28 07:02

本文选题：煤矿开采 + 地震作用　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：针对煤矿采动区建筑物的地震损伤演化过程尚不明晰的问题,考虑到煤矿采动与地震联合成灾机制的复杂性,基于损伤力学理论,采用地震工程学、开采沉陷学以及结构动力学等相关理论,建立采动区地震损害影响下的建筑物动力损伤判据,根据抗震设计规范选取两组实际记录地震波(唐山波、迁安波)以及一组人工地震波,建立ANSYS有限元模型,通过设定不同工况,分别通过数值计算分析建筑物在地震作用下的损伤以及在采动地震联合作用下的动力响应分析。根据煤矿采动建筑物地震动力破坏的损伤成灾机制,探讨建筑物地震灾害作用以及采动与地震联合作用下的损伤致灾机理,通过对比分析表明：地震灾害作用下,由于选取的三组地震波的加强时长的不同,其地震作用下建筑物结构位移、速度、加速度时程曲线以及楼层位移、速度、弯矩等曲线都有很大的不同,顶层的位移、速度以及加速度峰值较其他楼层的变化更加明显,容易发生突变,而根据楼层最大弯矩图,建筑在某一楼层弯矩值存在突变,很有可能出现塑性铰。建筑物承受的损伤与施加的地震波加强时长有着直接的关系,加强时长越长,建筑动力响应越明显,建筑物损伤越大。在对地震灾害作用下建筑物损伤以及采动地震联合作用下建筑物损伤的对比分析可知,在采动地震联合作用下,建筑物的动力响应数值均远大于建筑物在只有地震作用时的各种动力响应的数值,也就是采动作用对建筑在受到地震破坏时起到了一个放大作用。建筑物在地震作用下煤矿采动对建筑物所产生的次生损伤不断的发展,导致建筑物的薄弱层位置形成塑性铰,严重削弱了建筑物的抗震性能,同时煤矿采动也加剧了建筑的地震动力响应,对与煤矿采动建筑必须对煤矿开采变形与地震荷载的成灾机理,以及二者的联合作用成灾机制予以重视,开展煤矿采动建筑物抗开采变形隔震保护体系相关的研究工作。
[Abstract]:In view of the unclear process of seismic damage evolution of buildings in mining area of coal mine, considering the complexity of combined mechanism of mining and earthquake, seismic engineering is adopted based on the theory of damage mechanics. Based on mining subsidence theory and structural dynamics theory, the dynamic damage criterion of buildings affected by earthquake damage in mining area is established. According to the seismic design code, two groups of actual seismic waves (Tangshan wave, Tangshan wave) are selected. The finite element model of ANSYS is established, and the damage of buildings under earthquake action and the dynamic response under combined action of mining earthquake are analyzed by numerical calculation under different working conditions. According to the mechanism of seismic dynamic damage of mining buildings in coal mines, the mechanism of damage and disaster caused by seismic disasters of buildings and the combined action of mining and earthquake is discussed. The results show that: under the action of earthquake disaster, Due to the difference of strengthening time between the three groups of seismic waves, the structural displacement, velocity, acceleration time history curve, floor displacement, velocity and bending moment curves are very different under the earthquake action, and the displacement of the top floor. The change of the velocity and acceleration peak is more obvious than that of the other floors, and it is easy to mutate. According to the maximum bending moment diagram of the floor, there is a sudden change in the moment value of the building on a certain floor, and the plastic hinge is likely to appear. The damage sustained by buildings is directly related to the strengthening time of applied seismic waves. The longer the strengthening time is, the more obvious the dynamic response of buildings is and the greater the damage of buildings is. By comparing and analyzing the damage of buildings under earthquake disaster and under the combined action of mining and earthquake, we can know that under the combined action of mining and earthquake, The dynamic response of buildings is much larger than that of buildings under only seismic action, that is, the action of taking action plays a magnifying role when the buildings are damaged by earthquakes. Under the action of earthquake, the secondary damage caused by the mining of coal mine on the building is developing continuously, which leads to the plastic hinge of the weak floor of the building, which seriously weakens the seismic performance of the building. At the same time, the mining of coal mine also intensifies the seismic dynamic response of the building. Therefore, the mechanism of deformation and seismic load in coal mining and the mechanism of the combined action of the two must be paid more attention to. To carry out the research work related to seismic isolation protection system of mining buildings against mining deformation.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU311.3

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