新型装配式可调电缆支架的承载力特性试验研究OA北大核心CHSSCDCSTPCD

A new type of assembled adjustable cable support was proposed to address difficulties with installing cable support in circular tunnels.Its load-bearing characteristics were experimentally investigated.The support's load-bearing capacity characteristics under different angular conditions(0°,-45° and 45°)were analyzed.Its deformation characteristics,load-displacement curve characteristics,and strain development patterns of typical parts were studied considering factors including support length,cross-arm height and width,diagonal brace diameter,and horizontal bolt size.Besides,nonlinear simulation analysis of the new support's load-bearing capacity was carried out.Based on these,theory of computation and design methods for its load-bearing capacity of the support were proposed.The results showed that the typical failure mode of the support was the overall instability and failure of the diagonal brace,with the side bending and torsional deformation of the cross-arm.The vertical stiffness and ultimate load-bearing capacity of the support decreased with the increase of the adjustment angle,reaching their minimum at 45°.The lateral load-bearing capacity characteristics were less affected by the angle,making the angular condition of 45° the most unfavorable.The force distribution of the new cable support bracket system is reasonable,possessing sufficient strength,stiffness,and stable load-bearing capacity,making it suitable for engineering practice.