Experimental Studies on the Fundamental Properties for High-Strength Bolt Connections at Elevated Temperatures

摘要

The material properties and friction coefficient of steel are very important to the fire resistance analysis of high-strength bolt connections. This paper reports on the results of the experimental studies on the high-temperature properties of 20MnTiB steel which is widely used in high-strength bolts and the friction coefficient of 16Mn steel plates which is a necessary parameter for bolted frictional connection analysis. The test data includes yield strength, limit strength, modulus of elasticity, elongation and expansion coefficient of 20MnTiB steel at elevated temperature, and the friction coefficients between two 16Mn steel plates under elevated temperatures and after cooling. Based on the data from the tests, the mathematical models for predicting the mechanical properties of 20MnTiB steel and friction coefficients of 16Mn steel plates have been established.