Abstract: In order to achieve remote over temperature alarm when structural components reach their fire resistance limit in building fires, a critical temperature remote over temperature alarm device for structural components was developed using the characteristics of fixed melting point of different alloy materials at high temperatures, combined with controller area network bus technology, and experimental verification was carried out. The arrangement of temperature sensing alloys on H-shaped steel column components was analyzed using finite element method. The factors affecting the critical temperature on the surface of H-shaped steel columns when they reach their fire resistance limit under the influence of the standard heating curve have been clarified, and a calculation method for the critical temperature of H-shaped steel columns has been proposed. The research results indicate that the developed alarm device can achieve over temperature alarm when the structural components reach the fire resistance limit, and the effectiveness of the alarm device has been verified through experiments; Temperature sensing alloys should be arranged at any position on the surface of steel components within the middle 2/3 column height range of H-shaped steel columns; The constraint method, load ratio, section size, and aspect ratio have a significant impact on the critical surface temperature of H-shaped steel column components.

Key words: controller area network, temperature, H-shaped steel columns, remote alarm