Residual Ability Analysis Of Loading Parameters On H-type Columns Under Axial Load

Structure inevitably encounters static loads such as pulling、bending、twisting and dynamic loads such as earthquake and wind,sometime faces theaccidental loads. Hot-rolled steel has the characteristics of flange width, lateralstiffness, strong resistance to bending, so it is often used in industrial and civilsteel beams、columns、load carriers, underground engineering and large-spansteel piles bridge structure. Such thin-walled structures once suffered defeatimpact load, it will occur large deformation and resulting in a greater negativeimpact on the subsequent capacity, residual strength of hot-rolled steel underimpacted loads becomes a hot issue of engineering. This paper aims at the hotand difficult issue, conducts research work from three aspects:1、In the structural laboratory of Taiyuan University,using gravity drophammer machine DHR9401,we carried out impact test of H-type steel. Themain parameters includes height and hammer’s quality. Obtaining damage formof specimens, the impact force-time curve、middle deflection and so on. Theresults showed that hot-rolled H-type steel specimens has good plasticdeformation and bending ability under impact loads.2、 Through the computer-controlled servo pressure testing machine 500tYAW-5000， we carried out residual ability on damaged steel andcomparative test about undamaged steel. We receives residual H-type steel’sdeformation, axial compression、 loads、 lateral displacement and axialdisplacement, the remaining carrying capacity and so on.3、Using finite software ABAQUS, we set up numerical model on theabove test and verify the accuracy of the model combining with experimentaldata.4、Using the verified finite model, the paper shows influence of impact andremaining carrying capacity on the load parameters including axial force,hammer quality and impact position. The results tell us that: with axial forcestronger, the axial displacement and middle displacement of H-type steel weaker,leading to carrying capacity of H-type steel reduces; with the quality ofhammer bigger, carrying capacity of H-type steel becomes smaller, in additionto,the time to get limit load becomes longer; with load position changing,1/2position of H-type steel shows residual ability becomes lower obviously, so themiddle position is the most unfavorable position. Through calculation, we getaxial compression ratio, the function between impact and the residual carryingcapacity of H-type steel column, providing a basis for assessing remaining aftercarrying capacity of such member under impact.