One method of drawing internal force chart rapidly is introduced in this paper, which is based on the differential coefficient connection between load collection degree and internal force.

This paper analyzes the differential coefficient connection between load collection degree and internal force, which in the cross section of pull and press transformation,stalk twist transformation and the beam flection transformation,and sums to one rapid drawing internal force chart method.

Analysis of anti-collapse ability of casing under the action of concentrated load;

In view of offshore drilling practice,a method has been derived for calculating the critical load on riser under the combined action of wellhead concentrated load and dead weight uniform load by assuming the drilling riser to be a pipe member with one end fixed and other end hinged and based on the principle of energy conservation and theory of elastic stability.

in this paper, the reciprocal theorem is applied tO researchon the bending problem of set square with three clamped edges undera concentrated load acting at any of its POints, the accuracy solutionof this problem is given.

The principle of minimum potential energy of mixed variables method is applied to solve the bending problem of the plate with four edges simply supported by elastic foundation under several concentrated loads.

For the problem of a magnetoelectroelastic cone under concentrated loads (include torsional moment Mz leads to torsion, concentrated force Pz and point charge Q lead to compression, concentrated force Px and concentrated moment MN lead to bending) at its apex, the potential functions were constructed by a linear composition of a group o.

Behavior of inflection of RC beams with exposed tensile reinforcement under concentrated load;

Analysis of remnant strength of RC beams with exposed tensile reinforcement under concentrated load;

Strength test of RC continuous slabs under concentrated load;