In order to study basic roof ' s destruction movement that affects working face in horizontal section top coal caving in mining steep seams , this paper analyses tension of roof using elastic and thin board theory and concludes criterion of roof destruction based on long and narrow thin board 摘要为研究急斜煤层水平分段放顶煤开采过程中基本顶破坏活动对工作面的影响，根据急斜煤层基本顶具有倾斜狭长板的特点，运用弹性薄板理论对基本顶岩层进行了拉应力分析，得出了顶板破断的判别准则，建立了基本顶初次破断后形成的“铰接结构”的力学模型。
On the basis , three elastic calculation coefficients of the two - way composite slab on three common boundary conditions are deduced and calculated by applying the classic elastic plane theory . in the thesis , the elastic design methods of pk prestressed composite two - way slab is explored and studied by the example . furthermore , it is also studied how to apply the yield - line design method to design the prestressed two - way composite floor slabs 本文以此为依据,应用经典弯曲薄板理论,采用李维法推导和计算了这种双向楼板三种常见边界下的挠度和内弯矩弹性计算系数,并在此基础上通过算例探讨了pk预应力双向叠合楼板的弹性设计方法,同时还对其塑性铰线设计方法进行了研究。
The side displacement of the glass plate center is larger or less than the glass plate thickness , for the 3d geometric size of the glass plate and the lateral load vary in a wide range . in other words , the mechanic analysis of glass plate belongs to large deflection or small deflection theory in thin plate theory 由于幕墙玻璃的三向几何尺寸和横向荷载集度可在较大的范围内变动，玻璃板中心的侧向位移，有可能小于或大于玻璃板的厚度，也就是说，幕墙玻璃的力学分析，既可能属于薄板理论中的小挠度问题，也可能属于大挠度问题。
The article gives the results of rectangular moderate - thick plates under various length - width ratios and various thickness - width ratios and the results are compared with corresponding series solution about thin plates . at last the article gives a rough limitation between thin and thick plates according to the absolute values of their relative er - 本文最后计算了弹性地基上不同长宽比的中厚板在不同的厚宽比情况下的中点挠度值,并与薄板理论的级数精确解答进行比较,根据其相对的误差绝对值,对弹性地基上薄板和中厚板尝试进行了大致的界定。
Study on the characteristic of piezoceramic actuator is an important step in the studying of undamaged - inspection process based on piezoceramic actuator technology . this thesis firstly dwells on the sample model of piezoceramic actuator under the restriction of concrete . through theory and experimentation analysis , we arrives at a conclusion that the vibration behavior of piezoceramic actuator belongs to that of the thin plate 本文着重研究了在混凝土约束条件下压电陶瓷片的样本模型，在此基础上通过理论探讨和实验现象分析，认为埋置于混凝土中的压电陶瓷片是符合弹性力学中克希霍夫有关薄板理论的假设，是属于薄板振动问题，并确定了其边界约束条件。
( 2 ) based on the wave equation in the acoustic fluid space and the theory of thin - wall structure , the non - symmetrical coupled structure - acoustic dynamic equation without damping is studied . the non - symmetric system of the finite element model for coupled structure - acoustic response is solved by the conjugate subspace iteration method 由声空间波动方程和薄板理论出发，对声场?结构耦合系统的模态分析提出了有限元数值方法，采用共扼子空间迭代法对非对称特征方程进行处理，采用静凝聚法消除质量矩阵的奇异性。
In order to study the basic roof ' s destruction movement that affects working face in horizontal section top coal caving in mining steep seams , this paper analyses tension of roof using elastic and thin board theory and obtains criterion of roof destruction based on long and narrow thin board 摘要为研究急斜煤层水平分段放顶煤开采过程中基本顶破坏活动对工作面的影响，根据急斜煤层基本顶具有倾斜狭长板的特点，运用弹性薄板理论对基本顶岩层进行了拉应力分析，得出了顶板破断的判别准则，建立了基本顶初次破断后形成的“铰接结构”的力学模型。
