| The load-bearing lightweight steel structure is built by welding transverse and inclined lace bar on longitudinal chords , which is called the spatial steel frame .The concrete structure with spatial steel frame is gained by substituting spatial welding steel frame for binding steel skeleton in reinforced concrete structure. In order to study on the seismic behavior of concrete frame with spatial steel frame, including its bearing capacity, deformation capability, ductility as well as failure mechanism, the comparison of the tests of 2 the concrete frames with spatial steel and 1 reinforced concrete frame subjected to the low cyclic reversed load are carried out. The results of the tests showed that the initial stiffness of the concrete frame with spatial steel frame is almost the same as that of the reinforced concrete frame .The stiffness degradation of the concrete frame with spatial steel frame is slower than that of the reinforced concrete frame after yielding of the specimen .Under the same conditions, the ductility of the concrete frame with spatial steel frame is better than of the reinforced concrete frame .So seismic behavior of the concrete frames with spatial steel frame is better than that of reinforced concrete frame.Test results of the frame structure with spatial steel frame are analysed by using the elastic-plastic nonlinear program Drain-2d+ .Compared with hysteresis curves of skeleton curve ,exhibit development of plastic hinge .The results of analysis are in good agreement with the experimental results .On the basis of the experimental research and theory analysis, high strength concrete frame structure with spatial steel frame including section design and detailing requirement and so on, which are proposed . |
