In construction of the grid shell roof of He nan Sports Center, engineers used 48mm×3\^5mm steel pipes to set up a over-site scaffolding and structural steel frame support system in order to install the steel roof structure.

The Study on Static Performance and Dynamic Performance of Mega Steel Frame;

Based on the research results,the theoretical basis and some reasonable suggestions are put forward in the engineering design of mega steel frames.

Influence of second-order effects on response history analysis of steel megaframe;

Performance analysis of steel megaframe with sloping megacolumns;

Practical analysis approach of huge steel frames considering P-Δ effects;

An equivalent model for the huge steel frame structure is established using continuous concept and equivalent principle,and then considering second order effect of the structures,a simplified model of second order calculation obtained,which may be used for non\|iterative second\|order analysis of these sorts of structures.

To study a practical approach of second order displacements for huge steel frames, an equivalent model for the huge steel frame structure is established according to continuous concept and stiffness equivalent principle.