Structural Design And Static And Dynamic Analysis Of Highway Steel Frame Shed Tunnel For Rockfall Prevention

In light of the construction demand of practical projects, this thesis takes the example of rockfall prevention steel frame shed tunnel in G213secondary level road which is one of the rebuilding projects after disaster. This thesis set the structure of standard span steel shed-tunnel structure in two-lane double direction traffic as an example to issue the structural design of components including main beam, secondary beam, steel column, tie bar, bracing, roof and interior and exterior walls. Static analysis of steel frame shed tunnel under different combination of loads is done with the finite element analysis program-MIDAS, and strength of the main beam, secondary beam, steel column, tie bar, bracing, component nodes and concrete slab are checked. The effect of rockfall impact on steel frame shed tunnel is simulated and analyzed with finite element program-ANSYS, and dynamic response of structure with different sizes of main beams and different depths of backfill earth are analyzed. Consequently, the optimum depth of backfill earth and maximum bearing falling height are obtained. Dynamic analysis of rockfall impact on steel shed-tunnel structure with different beam sizes and substitution depths of EPS foam is processed. As a result, the optimum depth of backfill earth and EPS foam for each main beam size are obtained.