From discussing the relations between geometrical component and statically determinate property of structures,the suitability was explained in this paper to employ geometrical unstable systems in long-span bridge structures.

Analysis of support subside of statically determinate structure;

Statically determinate structures, one of the widely- used structural forms of the mainly studied subjects, is very important in mechanical teaching and very useful in the mechanical studying.

Rational utilization of second moment in pre-stressed concrete statically indeterminate structure;

Creep analysis of statically indeterminate structure by force method;

Discussion about deriving the displacement calculation formula of a statically indeterminate structure;