3. Based on active control model of cables vibration, single modal and multi-modal controls under different load case are realized through linear quadratic optimal control strategy.

Base on the prime realization of its static property, parameter analysis of its static property is done consisting of deferent number of truss, deferent height of truss, deferent scale of height of masts, deferent boundary condition and deferent magnitude of pre-stress in deferent load case.

The geometric nonlinear analysis of three types of large-span annular cable truss structures is put forward by using commercial FEM program. Their static properties in deferent load case are concluded, and some suggestions for actual projects are also presented.

The stability of structure is studied by nonlinear finite element method,and the effects of load case,initial defect,prestress on stability are also discussed.

It is also a way to let us know what happens in the structure, under the different load case, so we can have a better understanding of the structure thus improve the design method and operation of the structure.

The most disadvantageous loading condition of the deformation of multi arch dam is of high water level, low air temperature and high water temperature.

Considering the structural loading condition and the construction technology,the anchor method of prestressed strands,the included angle between the counterforts and the depth of steel liner are discussed in view of the design proposal with post tension vacuum assistance injection technology and the other one with post tension unbonded strands.

Then, carry on space finite element analyse to model bridge by finite element procedure Ansys7.0, and confirm the ultimate load carrying capacity of model bridge in different load condition.

Firstly, calculate the asphalt pavement structure response in linear elastic static load condition by FEM software. Afterwards, analyze detailed the pavement structure stable temperature field at each main time, transient temperature field changing process in 2D plane strain state in a day under summer and winter typical weather condition and the asphalt pavement structure temperature stress distributing and change regularity in the heat linear elastic plane strain premise.

Numerical results show that the number of the overall selfstress modes is equal to the redundant order of the dome after considering the symmetry of the structure,and it increases regularly with increase of the hoop number. The optimal initial prestress distribution reaches the limiting state by some cables slack under certain load condition.

The mechanics relationship of the nodes and elements on the arch bridge axis are analyzed by estimating a finite element(model) which is based on a primal arch bridge axis and a given load condition. Then in the light of the rationale of the optimization of arch bridge axis,particular attention is paid to the application of the iterative calculations of finite element method program to gain the(coordinates) of the scattered spots in arch rib that are close to the pressure line.

The mechanical property test of the model covering 3 stages under 10 load conditions is carried out to study the loading property of through truss composite beam with simple support.

To analyze the reason of cracks on downstream face of the Longyangxia Dam discovered during the safety assessment for final acceptance, three dimensional finite element model was formed and its parameters were checked using measured displacement value of the dam. Possible load conditions lead to cracks was selected. Stress distribution was calculated considering and not considering opening of transverse joints.

Finally the average index of reli-ability is obtained for every typical soil layer in different load conditions when a total safety factor of 2. 0 is given.

Kaoyishan tunnel support structure calculation under multi load conditions in ClassⅡsurrounding rock collapse section on Beijing to Zhuhai expressway is introduced,including such aspects as technical data,calculation method,result analysis and preliminary conclusions.

The second approach depends on the direct calculation of the derivatives of the stiffness matrix, which are stored for re-use in multiple load case analyses, and subsequent matrix multiplications to evaluate the design sensitivities.

In truss topology optimization against buckling constraints, the extension from considering a single load case to include multiple loading conditions remains an unsolved problem in the ground structure approach.

The original method for a single load case developed by these authors is extended to deal with multiple load cases.

3D and multiple load case bi-directional evolutionary structural optimization (BESO)

Two different algorithms were used to find the best structure experiencing more than one load case and the results of each are included.

Experiments results show that the average throughput of the proposed algorithm is about five percents higher than that of the other two algorithms and the average response time is four percents higher under high system loading condition.

In addition, it was observed that the geometrical parameters, such as the support length, vertical support length, and vertical slot depth, had a considerable effect on the peak adhesive and plate stresses, depending on the loading condition.

The second loading condition, of a tensile specimen containing a hole, is intended to illustrate the applicability of the system to more complex loading conditions where stress concentrations modify the deformation pattern.

The third loading condition is around the tip of a crack propagating in a predictable way in a standard fracture toughness specimen.

The second loading condition, of a tensile specimen containing a hole, is intended to illustrate the applicability of the system to more complex loading conditions where stress concentrations modify the deformation pattern.

We use the major radius of the ellipse as the fault indicator and the distance between the point of no-load condition and the center of the ellipse on the PQ plane as its normalization value.

The design formulae of the frequency deviation under optimum load condition and under the condition of the modulating stage with series negative current feedback are also given.

Higher order 2D models yield accurate results for any considered load condition in the case of moderately thick plates, a/h=10.

For the considered off-centric load condition and thick plates good results are provided for some output quantities.

The magnitude of power component directly resulted from rotor fault is used as the fault indicator and the distance between the point of no-load condition and the center of the ellipse as its normalization value.

The results obtained enable the resistance of cosmonauts to standard G-load conditions during real spaceflights to be predicted.

The amplifier passband is 20-240 MHz; gain flatness, ±1.5 dB; gain, 40 dB; maximal output power, 20 W minimum; consumption current under no-signal condition, 2.2 A; and under peak-load conditions, 6.8 A.

Energy balance in the crack growth initiation under pulsed-load conditions

Significant improvement of fuel economy was found mainly at partial load conditions with oil-cooling in comparison with the baseline water-cooling both for the two engines.

This loading configuration is intended to reproduce the predicted deformations to illustrate the applicability of the method under simple load conditions.