Study on anti-sliding performance of cable clamps under and after elevated temperature

Abstract

Cable clamps are key joints in building cable structures and are vulnerable positions in fire accidents. Currently, there is little research on the elevated-temperature mechanical properties of cable clamps. Therefore, the high-temperature mechanical properties of cable clamps were investigated in this study. First, anti-sliding tests at room temperature, elevated temperatures, and after elevated temperatures were conducted for the cable clamps, and the pushing force-sliding displacement curves of the cable clamps were obtained. The relaxation law of the bolt tightening force and the anti-sliding performance of the cable clamps were studied. The results indicated that when the temperature exceeded 300 °C, the anti-sliding performance of cable clamps started to decline. When the temperature reached 500 °C, the anti-sliding bearing capacity of cable clamp was approximately 27 % of that at room temperature. For cable clamps after high-temperature treatment, when the heat treatment temperature exceeded 300 °C, the anti-sliding bearing capacity was approximately 50 % of that at room temperature. Therefore, based on the ABAQUS finite element software, simplified and refined models of the cable clamps are proposed to simulate the sliding process of locked coil wire rope clamps. The effects of material properties and non-uniform expansion on the anti-sliding performance of cable clamps were studied, which provides a theoretical basis for the fire resistance design of building cable structures.