The vibration transmission property of the one-, two-, and three-dimensional PCs with finite structure as well as the beams and plates based on the idea of PCs is researched with the finite element simulation and the vibration experiment.

The dynamic buckling of elastic structures, such as beams and plates, when subjected to an axial impact at one end, is studied in the present paper based on the theory of stress wave propagation.

Beams and plates on Winkler foundation and elastic half space were calculated by collocation method and comparisons with theoretical results were made,which had indicated that this trial function was suited to solving many boundary value problems and also had a high accuracy.

Based on the basic theory of element modal strain energy change and structure shape change before and after damage, the damage index was put forward to locate structure damage, the basic formulas are obtained firstly to identify the damage location and discriminate qualitatively the damage degree for beams and plates, and the program is compiled in calculating the damage index for beams and plates.

The parameters study of the weight functions of Element Free Method has been carried out to determine their best values by the modal analysis of the beams and plates.

Beams and plates on Winkler foundation were calculated in method and comparisons with theoretical results were made. It proves that this trial function is applied to solving many boundary value problems with a high accuracy.

In this paper, detailed numerical analysis and experiment investigations on dynamic counterintuitive response of beams and plates subjected to short pulse loading have been studied.

Firstly by energy methods, combined governing equation of beams and plates can be established Then by introducing three different stress functions and δ function, and according to the equilibrium equation and compability condition, a Von Karman equation of the stiffened plates can be established.

This program attempts to do the stress analys is of the space structures compoesd of bars, beams and plates by the small machine with small capacity of inner memory and imperfect outer memory.The main difficulty to compute the large complex structure by small machines is how to handle the overall matrix of rigidity. The formation of the overall matrix and transformation to the triang- le-shaped matrix are performed step by step. In the course of the transformation, those elements of the triangle matrix...

This program attempts to do the stress analys is of the space structures compoesd of bars, beams and plates by the small machine with small capacity of inner memory and imperfect outer memory.The main difficulty to compute the large complex structure by small machines is how to handle the overall matrix of rigidity. The formation of the overall matrix and transformation to the triang- le-shaped matrix are performed step by step. In the course of the transformation, those elements of the triangle matrix which effect the subse- quent triangle matrix do not occupy memory cel1s separately but add directly to the corresponding rooms. Thus a large amount of inner memory are saved and the computations are speeded up. Besides, in the overall matrix of rigidity, the combined coordinate system of local and overall co-ordinates is used so that the peculiarity of the linear equations due to the non-effective degrees of freedom are solved more satisfactory. Those unnecessary and unimportant parameters of degrees of freedom are excluded from the overall matrix of rigidity to save the storage of inner memory and speed up the computation. The aim to use smaller computing machine to solve large scale structural problems is thus fulfilled.

Optimality conditions of a flexural member with lower bound on its cross section have been discussed by prager and Morz. The optimal design of fibre-reinforced plates having prescribed minimum specific fibre-volume has been obtained by Charrett and Rozvany.But the plastic speciality of optimal members at its minimum section was neglectd in their discussion so that optimality conditions might be inadequate. In this paper, the problem montioned above is studied again and the perfect Optimality conditions are obtained.These...

Optimality conditions of a flexural member with lower bound on its cross section have been discussed by prager and Morz. The optimal design of fibre-reinforced plates having prescribed minimum specific fibre-volume has been obtained by Charrett and Rozvany.But the plastic speciality of optimal members at its minimum section was neglectd in their discussion so that optimality conditions might be inadequate. In this paper, the problem montioned above is studied again and the perfect Optimality conditions are obtained.These conditions are employed to design several beams and plates. The calculation result of the virtual work equality shows them to be adequate.

The present paper, by using the Quasi--Conforming Elements Techniques, ha- established the general purpose elements for thick/thin beam and plate bending prs oblems. Among those elements, the 6-parameter beam element QCB--6 and the 15- parameter plate bending element possessing relatively higher accuracy, less amo- unt of computational effort, are suitable for both thick/thin beam and plate and oan be afforded for practical uses. In this paper the choice of trial functions and their effects...

The present paper, by using the Quasi--Conforming Elements Techniques, ha- established the general purpose elements for thick/thin beam and plate bending prs oblems. Among those elements, the 6-parameter beam element QCB--6 and the 15- parameter plate bending element possessing relatively higher accuracy, less amo- unt of computational effort, are suitable for both thick/thin beam and plate and oan be afforded for practical uses. In this paper the choice of trial functions and their effects on element behavi- our have been discussed through the comprehensive analysis of eight kinds of be- am and plate elements. It is considered that, no matter what kind of methods are choisen for establishing elements, the choice of the trial function is of great im- portance of which both the interpolating accuracy and the suitable matching among various functions must be ensured.