Hao Jiping

Exact solution of large deformation basic equations of circular membrane under central force

Exact solution of the nonlinear boundary value problem for the basic equation and boundary condition of circular membrane under central force was obtained by using new simple methods. The existence and uniqueness of the solution were discussed by using of modern immovable point theorems. Although specific problem is treated, the basic principles of the methods can be applied to a considerable variety of nonlinear problems.

Finite Element Analysis Model of High Cycle Fatigue Damage for Metal Structure

This paper gets some material constants of elastic and plastic fatigue damage evolutionary equations from high and low cycle fatigue experiments of unnotched metal samples on the basis of fundamental principles of damage mechanics. Then, the finite element program ANSYS is used to simulate the development of crack of notched metal samples under high cycles of constant-amplitude stress and the distributions of elastic and plastic areas and so on. The whole variation of stress field, strain field and damage field are completely described. Finally, to compare it with the experimental results, the applicability and practicability of the model is appraised.

Experimental research and finite element analysis on new joint of reticulated shells

Publisher Summary The chapter presents a new cylinder joint for single-layer lattice shells. Full-scale experiments of joints are conducted in the chapter. The ultimate load carrying capacity of a joint is analyzed by using the finite element program ANSYS. The results of experiments and finite element analysis (FEA) show that a new cylinder joint has a good compression behavior. The most widely used joints are welded hollow spherical joints and bolted spherical joints, but they have drawbacks too. The chapter also explains that the thickness of wall had a great influence on the compression load bearing capacity of a new cylinder joint. Planar and unilateral behavior of a new cylinder joint is also studied in the chapter.

Experimental research on hysteretic behaviour of tubular joints

Publisher Summary The chapter explores the experimental research on the hysteretic behavior of tubular joints. Some full-scale tubular T and N joints are tested under cyclic quasi-static loadings to understand its performance under vibrative loads. The results of two experiments show hysteretic curves of the joints. In another experiment, the damage variable is derived and is used in the numerical analysis. The experimental results of the hysteretic behavior are used to substantiate the analysis. The distortion and energy dissipation capability of tubular joints under cyclic loadings are evaluated in the chapter. The cyclic inelastic performance of a structure was the key to satisfactory seismic performance during large infrequent earthquakes. Based on this observation, the effects of severe earthquake ground motions are simulated by quasi-static cyclic loadings which can produce large inelastic deformation in the structures tested. The hysteresis curve obtained from the study can be used to assess the seismic resistance performance of a structure.