建筑结构学报2012，Vol.33Issue(2)：33-40,8.
高强度螺栓过火冷却后力学性能试验研究
Mechanical properties of high-strength bolts after fire
摘要
Abstract
High-strength bolts which are widely used in steel structural connections are more temperature-sensitive than hot finished steel. To obtain the mechanical properties of high-strength bolts after fire including stress-strain curves, strength and elasticity modulus, a series of experiments on 8.8S bolts and 10. 9S bolts were carried out in this study. In order to simulate the real situations in event of fire, both natural cooling and water cooling were employed in the tests. The test results show that heating and cooling have a great effect on the mechanical properties of high-strength bolts after fire when the temperature of high-strength bolts attained is above 400℃. And the effect of natural cooling is very different from that of water cooling when attained temperature is above 700℃. After natural cooling, the stressstrain curves become softer and more ductile, and the strength is regained slightly. After water cooling, the ductility reduces significantly whereas the strength is regained to a great extent. For 10. 9S high-strength bolts subjected to water cooling the post-fire strength even exceeds the normal strength approximately 20% when the attained temperature is in excess of 800℃.关键词
高强度螺栓/自然冷却/泼水冷却/受火试验/受火后静力试验/力学性能Key words
high-strength bolt/natural cooling/water cooling/fire test/static test after fire/mechanical properties分类
建筑与水利引用本文复制引用
楼国彪,俞珊,王锐..高强度螺栓过火冷却后力学性能试验研究[J].建筑结构学报,2012,33(2):33-40,8.基金项目
科技部国家重点实验室基础研究项目（SLDRCE08-C-01）,国家自然科学基金项目（50308019）. （）
