Influence of structural nonlinearities on Internal force of super-long span cable-stayed bridge under service stage;

The paper made an introduction about the technical characteristics and application effects of the high efficiency super wide stored heat furnace using blast furnace gas in the product line of the Guofeng hot rolling mill.

Combining with the construction difficulties of precision control,field processing,assembling forming,aloft work,which exist in integral lifting of super-high large-span steel truss beam of Yantai Broadcast and Television Center building,the choice of lifting equipment,assembling face and installation operation platform are analyzed,and four 6×19mm wire ropes are adopted as suspender cable.

In order to find out the appropriate lateral seismic constraint system for super-long-span cable-stayed bridges,the seismic responses of super-long-span cable-stayed bridges with three lateral connection systems between side piers and girder were investigated,taking the Sutong Yangtze River Highway Bridge as studying object,and using the nonlinear time-history analysis method.

Due to the accumulation of errors during the cantilevel construction of super-long-span cable-stayed bridges,response under dead load may be stochastic and it can not be reflected by the traditional method of deterministic structural analysis.

In the paper,the mechanical characteristics of fluid viscous dampers are discussed firstly,and then the seismic response reduction of a super-long-span cable-stayed bridge by adding fluid viscous dampers is investigated.

It also presents both the challenges and glorious prospect of thesuper-long span bridges in sea-crossing engineering projects in the 21st century.