| Title |
Evaluation of Structural Performance and Improvement of Screw Thread Shape on 1,300 ㎫ High Strength Bolts |
| Keywords |
high strength bolts;screw thread shape;tensile strength;stress concentration;고장력볼트;나사형상;인장강도;응력집중 |
| Abstract |
Although high strength bolts with tensile strength of 1,000 ㎫ are mainly used in steel structure construction sites throughout the world, new high strength bolts are required owing to the installation of continuous long-span bridges resulting from the development and distribution of high strength steel and ultra-thick steel plates. Currently, high strength bolts with tensile strength of 1,300 ㎫ are being used. However, as they tend to place a large load on a small section of space, a high strength bolt of high structural performance and screw thread shape with less stress concentration is thought to be more effective. This study conducted analyses in order to develop an improved screw thread shape relative to the KS screw thread shape. A new screw thread shape with less stress concentration and effective load distribution at the time of fastening bolts and nuts was provided upon analysis of the characteristics of screw thread shape. Additionally, in an experimental study, the structural performance of high strength bolts with tensile strength of 1,300 ㎫ was investigated. The results revealed that the new screw thread shape was more effective than the existing screw thread shape in tcnns of structural performance and mitigating the stress concentration. |