In order to thoroughly study the spatial strut-and-tie theory on the punching failure of pile caps, two critical problems, value about end cross dimension of strut and calculation on strut strength, have been carried out based on the literatures and the research results from author.

Based on a study on the spatial strut-and-tie bearing mechanism of pile caps,nonlinear finite element analyses are conducted,and combining with a gradual least square method for multiple variables,theoretical formulae are derived for the punching shear bearing capacity of pile caps with ordinary uniform grid reinforcement.

Field test study on piled raft foundation designed on spatial truss theory;

This paper introduces a new kind of prestressed structure form named prestressed bottom chord shuttle shape spatial truss which is used in Chengdu International Meeting and Exhibition Center project; also studies the construction of prestressed cable by limited element analysis in connection with practical situation.

This paper introduces the structural design of the recreation ground spatial truss roof.

Analysis of the effect caused by the nodal moment on steel space truss;

On the structure of the space truss compound girder made from steel pipe concrete;

The study indicates that the transfer mechanism conforms to the space truss model.