First, the eigenvalues of elastic steel arches with non-holes in web are computed, and the buckling load as well as buckling mode related to planar first unstable failure mode is determined for different restrictions and different loads.

The paper uses the 3-D finite contact model of the pile and soil to simulate the contact condition, and has discussed separately the critical buckling load of the foundation under no soil body and having soil body.

In addition, the influence of initial imperfection to ultimate nonlinear buckling load must be considered in buckling analysis and the loading capability of joints may be a control factor in the design.

The critical buckling force of the top chord is gained by both the FEA method and the de-structuring testing of a single-storey "321" Prefabricated 21m-spanned Highway Steel Bridge.

The finite element method for bifurcation bucking of press-bending arch byconsidering the pre-bucking deformation is also carried out. The result shows that itwill be more approaching the authenticity than the method of linear-bucking.

This paper presents the following substance:on the basis of setting up a finite element model of three-span prestressed steel-concrete composite continuous beams with variable cross-section ,by changing some parameters such as arrangement styles、 tendon profiles、 prestressed force, the effects of prestressing on ultimate flexural strength、 deflection, cracking resistance load、 distribution of longitudinal stress and cross-section strain、 the stress increment of prestrssed tendons and elastic stability are discussed and analyzed .

The result shows that the nonlinear stability coefficient of bridge is 35% of eigenvalue flexure load,the central angle of curve dominates the critical stability coefficient and the max-displacement,it is not favorable for bridge stability that the number of tie-girder is more than two. 4 tabs,6 figs,8 refs.

Based on the results of the tests and literature, the formula of the buckling load of composite pipes under axially compressive load was presented based on Perry formula.

Analysis modeling for plate buckling load of vibration test

Thus, there has been a tendency in the construction field to derive a precise buckling load analysis model of member in order to establish accurate safety factors.

A numerical analysis model, using modal analysis to acquire the dynamic function calculated by dynamic parameter to get the buckling load of member, is proposed in this paper.

The analysis results indicated that this proposed method only needs to apply modal parameters of 7×7 test points to obtain a theoretical value of buckling load.

This paper presents another explaination of why the four steel box girder bridges in the world were damaged in 1969-1971。It is pointed out that the boundary conditions adopted in calc-ulating the buckling load of the compressive plates of box girderbridges are quite different from their actual boundary conditionsand that this difference is the primary cause led to such failureof these bridges as mentioned above,because the ultimate load ofthe compressive plate of box girder bridge determined accordingto its...

This paper presents another explaination of why the four steel box girder bridges in the world were damaged in 1969-1971。It is pointed out that the boundary conditions adopted in calc-ulating the buckling load of the compressive plates of box girderbridges are quite different from their actual boundary conditionsand that this difference is the primary cause led to such failureof these bridges as mentioned above,because the ultimate load ofthe compressive plate of box girder bridge determined accordingto its actual boundary conditions is less than the buckling loadadopted in the design of the bridge.This paper makes a point thatonly when the analysis of the ultimate load of the box girder isworked out,then its correct design may be obtained.In thispaper an approach to the space analysis with respect to the ulti-mate load of steel box girder bridges is given as a mathematicalmodel.

The buckling loads of bridge piles and the corresponding equivalent lengths were calculated by using Rayleigh Ritz method.The interaction of the soil and the pile,that is,the normal pressure of the soil on the pile and the skin friction along the pile were taken into account together with the weight of itself.Four kinds of coefficients of subgrade reactions and two kinds of modes of the distributions of the skin friction were discussed.The numerical results obtained from the present method were compared well...

The buckling loads of bridge piles and the corresponding equivalent lengths were calculated by using Rayleigh Ritz method.The interaction of the soil and the pile,that is,the normal pressure of the soil on the pile and the skin friction along the pile were taken into account together with the weight of itself.Four kinds of coefficients of subgrade reactions and two kinds of modes of the distributions of the skin friction were discussed.The numerical results obtained from the present method were compared well with the experimental results reported in the literature.A parametric study was undertaken to highlight the effects of subgrade reaction,subgrade friction,weight and geometric dimension of piles,on the buckling loads.

Based on the degenerated 3 dimensional beam element in , we proposed the degenerated 3 dimensional laminated curved beam element concerning geometrical nonlinear, which can be used for analysis on critical load of linear-elastic buckling of steel pipe-concrete arch of ShaoXing QingFang bridge. All the applications and results of them elucidate that the method and the elements presented in the paper are more effectively than much of the others. As a result, the method is a prospective method and is especially...

Based on the degenerated 3 dimensional beam element in , we proposed the degenerated 3 dimensional laminated curved beam element concerning geometrical nonlinear, which can be used for analysis on critical load of linear-elastic buckling of steel pipe-concrete arch of ShaoXing QingFang bridge. All the applications and results of them elucidate that the method and the elements presented in the paper are more effectively than much of the others. As a result, the method is a prospective method and is especially well applied to overall analysis in engineering problems.