This paper deals with the strength criterion for the hoisting equipment of a rig, measuring the stresses of the hook body capably loaded 500 short tons and conducting its three dimensional finite element calculation, in the linear elastic range, and further conducting its destructive test in the ela-stoplastic range and the calculation of its limit loaded capacity.

A 1/2-scale frame model of dynamic soil-pile-structure interaction was designed and manufactured,and the tests of its steady state excitation in elastic range were carried out.

This paper deals with the strength criterion for the hoisting equipment of a rig, measuring the stresses of the hook body capably loaded 500 short tons and conducting its three dimensional finite element calculation, in the linear elastic range, and further conducting its destructive test in the ela-stoplastic range and the calculation of its limit loaded capacity.

A 1/2-scale frame model of dynamic soil-pile-structure interaction was designed and manufactured,and the tests of its steady state excitation in elastic range were carried out.

Based on the Xiaojinkou double-arch tunnel engineering of the Guanghui highway, taking geometric similarity ratio Cl=25 and bulk density similarity ratio Cγ=1 as basic similarity ratio and grouping according to class of surrounding rock, so as to achieve complete similarity of various controlled physical and mechanical parameters in the elastic range and strictly simulate the characteristic of surrounding rock, physical property, original earth stress field, stiffness of support structures and support time, excavation process .

4. Through systemic experimental research, it is found that Poisson's ratio is nearly constant in the elastic range of RPC. The typical value of secant Poisson's ratio is 0.19. Also, RPC200 failure shapes and deformation process under uniaxial compression has been studied by academic analysis.

The paper puts forward the reasonable section (m=h/b) designing method that thinks beading strength and stability for the elastic range steel-beam in rectangle.

Studies indicate that this structure possess good integral working capacity and remains in elastic range under 1. 5 times the design load.

研究表明,预应力张弦梁具有良好的整体工作性能,在1．5倍设计荷载下结构仍处于弹性工作状态。

Since we used three gauges in one shot to record velocity profiles at different locations,so the Hugoniot data up to 3.6GPa (as in elastic range) was also obtained.

Specifically, with slender-body theory, moduli for materials containing dilute dispersions of aligned inclusions of slender, but otherwise arbitrary, axial geometry are found for the "elastic" range,

The results of the computations are verified by comparison with analytical solutions in the elastic range as well as with analytical elastic-plastic solutions employing Tresca's yield criterion available in the literature.

In particular, hours elasticities are in the elastic range.

The cooling and heating of a specimen, accompanying the loading and unloading, respectively, in the elastic range, are shown to affect plastic strain readings in a manner not considered by other investigators of microplasticity.

Furthermore, this experimental technique enables the determination of Poisson's ratio in the elastic range without any strain measurement.

In this paper an analytic expression eq. (5) of the dynamic elastic response of an axisymmetric simply supported circular plate subjected to a transverse step-concentrated load is derived first. For materials with bilinear stress-strain relations (See Fig. 2),plastic strains expressed in terms of the deflection w will be treated as transverse equivalent loads. Then, using the elastic response obtained above, the partial differential equation of motion eq. (11) beyond the elastic range is solved by direct...

In this paper an analytic expression eq. (5) of the dynamic elastic response of an axisymmetric simply supported circular plate subjected to a transverse step-concentrated load is derived first. For materials with bilinear stress-strain relations (See Fig. 2),plastic strains expressed in terms of the deflection w will be treated as transverse equivalent loads. Then, using the elastic response obtained above, the partial differential equation of motion eq. (11) beyond the elastic range is solved by direct iteration with respect to w. Numerical calculations are made for materials with different strain-hardening rates and the results are with better regularity as shown in Figs. 4, 5, 7, 8 and 9.

The characteristics in stress-strain relationship of sintered Chinese bauxites of thediaspore-kaolinite(DK)type have been investigated primarily by means of the torsionaltesting method.Experimental results indicate that: (1) In the low temperature range,the moduli of rigidity of all grades of sintered bauxite materials tend to increase withtemperature and the magnitude of modulus increased is dependent on the Al_2O_3 con -tent. (2) The stress-strain curves at different temperatures may be classified into threeparts,viz.,the...

The characteristics in stress-strain relationship of sintered Chinese bauxites of thediaspore-kaolinite(DK)type have been investigated primarily by means of the torsionaltesting method.Experimental results indicate that: (1) In the low temperature range,the moduli of rigidity of all grades of sintered bauxite materials tend to increase withtemperature and the magnitude of modulus increased is dependent on the Al_2O_3 con -tent. (2) The stress-strain curves at different temperatures may be classified into threeparts,viz.,the elastic range,the"slow flow"range and the"rapid flow"range, and corre-spondingly there are two transition temperatures, i. e., that from elasticity to(incipi-ent)plasticity and that from plastic flow to viscous flow.These transition temperaturesare also closely associated with the Al_2O_3 content,when the Al_2O_3 content is about 70%,these temperatures will be the highest.The order of resistance to strain of the materialsis:grade Ⅱ>grade Ⅰ> grade Ⅲ.The relationships between phase composition and micro-structure of the materials and their stress-strain behaviour are discussed.

The fluid-structure-pile-soil interaction has to be always considered in the dynamic analysis of fixed steel offshore platform. The piled structure offshore platform is a large complex structure system, which consists of a deck and equipments on it, resting on the top of a steel jacket. It is fixed to the seabed with a set of piles, which pass through the legs of the jacket and then insert into the soil. The dynamic forces applied on such a system include loads of wave, wind, current, operation, earthquake,...

The fluid-structure-pile-soil interaction has to be always considered in the dynamic analysis of fixed steel offshore platform. The piled structure offshore platform is a large complex structure system, which consists of a deck and equipments on it, resting on the top of a steel jacket. It is fixed to the seabed with a set of piles, which pass through the legs of the jacket and then insert into the soil. The dynamic forces applied on such a system include loads of wave, wind, current, operation, earthquake, etc. Of these, the wave loads are of most fundamental importance. For the fixed s ructure, velocity of which is comparable to that of water particles, the wave forces are non-linear. The piie-soil interaction can be represented by distributed springs, whose stiffness varies non-linearly acconding to p-y curves. In most of structural designs structural material is required to be in the elastic range under design loads. Howcver, during strong earthquake or storm some non-linear material behaviors without the collapes of the structure can be tolerated. In this paper it is showed that modal synthesis technique as well as modal superposition are extended in the study of non-linear dynamic response analysis of systems, subjected to regular wave loads. The forces can be computed from the given design wave, on wave theory. The direct step-by-step methods are adopted for gaining solutions of reduced non-linear dynamic equations. Non-linear forces are removed from the left of the equations to the right as pseudo force vectors. Thus it will considerably save computer storage and execution time. To date, there are only a few of reduction methods in non-linear dynamic analysis, so this work is of particular importance for large complex systems. Whose predicted non-linear responses are costly and time-consuming. Finally some examples of computer program DAPCS, which show the advantages and success of this method, are given.