本文選題：采動　切入點(diǎn)：地震動力　出處：《遼寧工程技術(shù)大學(xué)》2015年碩士論文

【摘要】：目前,煤礦采動區(qū)建筑物抗震性能的研究,多是以剛性地基假設(shè)為條件,本文考慮了上部結(jié)構(gòu)-基礎(chǔ)-地基三者的相互協(xié)調(diào)作用,深入探討煤礦采動與地震聯(lián)合作用下煤礦采動區(qū)建筑物的抗震性能劣化規(guī)律�；趽p傷力學(xué)理論,引入改進(jìn)的雙參數(shù)損傷模型計算地震作用下煤礦采動區(qū)建筑物的樓層損傷值。在已有研究的基礎(chǔ)上,選用有限元分析軟件ANSYS進(jìn)行數(shù)值計算,量化分析了煤礦采動損傷建筑在地震動力作用下的損傷演化過程,對煤礦采動損害影響下的建筑物的抗震性能劣化規(guī)律進(jìn)行了分析探討,以期得到礦區(qū)地下煤炭開采對建筑物抗震性能的擾動規(guī)律。計算結(jié)果表明：(1)由于SSI(土-結(jié)構(gòu)相互作用,下文均簡稱SSI)效應(yīng)的存在,地震波在土體傳播過程中高頻部分被濾弱,低頻占主導(dǎo)作用,一定程度上接近結(jié)構(gòu)共振頻率的分量增加；考慮SSI效應(yīng)后,改變了建筑結(jié)構(gòu)的自振特性,結(jié)構(gòu)的動力反應(yīng)曲線變得更加均勻；(2)由于SSI效應(yīng)的存在,結(jié)構(gòu)自振周期變大,自振頻率變小,結(jié)構(gòu)的整體剛度變?nèi)�。同時,結(jié)合結(jié)構(gòu)的頂點(diǎn)位移、頂點(diǎn)加速度和底部剪力時程曲線可知,剛性地基底部結(jié)構(gòu)較早的發(fā)生塑性損傷,耗散地震的輸入能量,計算結(jié)果明顯大于柔性地基；(3)由于煤礦采動的影響,建筑結(jié)構(gòu)的地震動力反應(yīng)增大,并且位移時程曲線普遍朝著建筑物傾斜的方向增幅較大；這是由于煤礦采動作用引起的地表移動變形,導(dǎo)致建筑傾斜致使建筑物重心位置發(fā)生偏移所導(dǎo)致的,加大了重力二階效應(yīng)對水平力作用下結(jié)構(gòu)位移的不利影響；結(jié)構(gòu)底部產(chǎn)生附加變形和附加應(yīng)力,采動造成的初始損傷會使結(jié)構(gòu)提前形成“柱鉸機(jī)制”或“梁鉸機(jī)制”,加劇了地震對煤礦采動建筑物的破壞效應(yīng)。(4)受煤礦采動的影響,結(jié)構(gòu)的剛度分布發(fā)生變化,地震動力作用下結(jié)構(gòu)底部的剛度退化加快,結(jié)構(gòu)整體剛度中心下移,一、二層層間彈塑性位移角超過規(guī)范值1/50,薄弱層位置下移,主要集中在一、二層;受煤礦采動的影響,底部結(jié)構(gòu)樓層損傷值急劇增加,底部結(jié)構(gòu)的易損性增加,嚴(yán)重削弱了建筑結(jié)構(gòu)的抗震性能。
[Abstract]:At present, the research of seismic behavior of buildings in coal mining area is mostly based on the assumption of rigid foundation. In this paper, the interaction of superstructure, foundation and foundation is considered.This paper probes into the law of deterioration of seismic performance of buildings in coal mining area under the combined action of coal mining and earthquake.Based on the theory of damage mechanics, an improved two-parameter damage model is introduced to calculate the floor damage value of buildings in mining area under earthquake.On the basis of existing research, the damage evolution process of mining damaged building in coal mine under seismic dynamic action is analyzed quantitatively by using finite element analysis software ANSYS to carry out numerical calculation.The deterioration law of seismic performance of buildings under the influence of mining damage is analyzed and discussed in order to obtain the disturbance law of underground coal mining on the seismic performance of buildings.The calculation results show that due to the existence of SSI (soil-structure interaction, hereinafter referred to as SSI) effect, the high frequency part of seismic wave is filtered in the process of soil mass propagation, the low frequency dominates, and the component close to the structural resonance frequency increases to a certain extent.Considering the SSI effect, the natural vibration characteristics of the building structure are changed, and the dynamic response curve of the structure becomes more uniform. (2) because of the existence of the SSI effect, the natural vibration period of the structure becomes larger, the natural vibration frequency becomes smaller, and the overall stiffness of the structure becomes flexible.At the same time, combined with the vertex displacement, the acceleration of the vertex and the shear history curve at the bottom of the structure, the plastic damage of the structure at the base of the rigid foundation occurred earlier and the input energy of the earthquake was dissipated.The calculated result is obviously larger than that of flexible foundation) because of the influence of coal mining, the seismic dynamic response of building structure increases, and the displacement time history curve generally increases in the direction of inclined building.This is caused by the ground movement and deformation caused by the mining action of coal mine, which leads to the deviation of the center of gravity of the building caused by the building inclination, which increases the adverse effect of the second-order gravity effect on the structural displacement under the horizontal force.Additional deformation and additional stress are produced at the bottom of the structure, and the initial damage caused by mining will lead the structure to form "column hinge mechanism" or "beam hinge mechanism" in advance, which intensifies the damage effect of earthquake to mining buildings in coal mines.The stiffness distribution of the structure changes, the stiffness degradation at the bottom of the structure accelerates under the earthquake dynamic action, the center of the overall stiffness of the structure moves down. The elastic-plastic displacement angle between the first and second layers exceeds the standard value by 1 / 50, and the weak layer position moves down, mainly concentrated in one.Under the influence of coal mining, the damage value of floor of bottom structure increases sharply, and the vulnerability of bottom structure increases, which seriously weakens the seismic performance of building structure.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TD82;TU352.11

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本文編號：1699375