On structure design of single-layer steel platform

To study dynamic effect resulted from the initial damage of the structure during progressive collapse, instantaneously applied load method was adopted to perform dynamic response analysis of a single-story steel plane frame with the failed middle column by a simplified model and frame element model respectively.

In this method,the construction load and structure weight can be transferred to the below two structural layers through channel steel platform and stayed-cable,which can distribute the load effectively,decrease the influence of construction on structure and the dip angle of supporting frame,a.

This paper introduces three major construction schemes of the steel cofferdam,steel platform and steel boxed cofferdam for deep-water bridge foundations,makes a study of the advantages and disadvantages of the three schemes and also gives applicable conditions of each of the schemes.

Based on structural characteristic of the inner concrete core, self-lifting technology of a steel platform design for construction of concrete core tube was employed and introduced in this paper.