Hainan Steel News: Steel Hysteresis Behavior and Seismic Design

Hainan high strength steel, the ductility and the production is simple, in large span, high-rise, heavy and light construction, is a cost-effective structure. In recent years with the rapid growth of China's steel production, steel has been widely used. Large landmark steel structures has become fashionable.

Steel has a good dynamic performance, but still under the strong earthquake destroyed the structure of the local, and even collapse incidents. Such as the 1994 US Northridge6.8 earthquake near the epicenter more than 150 high-rise steel frame multi-member largely intact under the circumstances, the beam-column connection node brittle fracture occurred greater degree; 1995 Hyogoken-Nanbu earthquake in Japan, Steel building collapsed, destroyed 476 large. Which form the main support destroy destroy, destroy columns and beams connecting nodes damage of confidence engineering over the years have had a strong impact. The main reason is that people have not yet fully understand the failure mechanism of steel structures in seismic action (cyclic loading) under the appropriate seismic design criteria and technical measures can not completely prevent the inevitable damage.

Seismic performance will depend on its ability to absorb and dissipate energy. Good toughness steel steel production does not necessarily meet the ductility requirements, mainly due to: under earthquake, the structure is subjected to cyclic strain larger role within a very short time; cyclic plasticity, low cycle fatigue causes materials Performance changes, the overall buckling member, partial plate buckling bearing capacity will cause deterioration and even fracture; strong earthquakes under high stress and stress concentration can cause net section break weld and bolt connections to pull off the connection torn between the parts of the layer. Only good designer can handle these problems, design a steel structure in order to have sufficient strength and ductility. Therefore, the steel seismic performance, failure mechanism, seismic design countermeasure research is very important.