摘要
内部钢骨与外包混凝土形成整体可提高钢构件的整体刚度,显著改善钢构件平面扭转屈曲性能,使钢材的强度得以充分发挥,比纯钢结构具有更大的刚度和阻尼,有利于控制结构的变形。通过对电阻压接焊焊接原理和工艺的分析,将焊接过程分为三个阶段,分别是:预压阶段,焊接阶段和回火阶段,通过不同阶段的参数设置来保证焊接钢筋的接头性能高于原钢筋母材,并通过一系列的力学试验加以证明,同时通过金相分析,得出焊接接头性能提高的根本原因在于钢筋焊缝处的金属以针状马氏体为主,焊缝周围以铁素体和奥氏体为主,因此为焊接箍筋替代传统箍筋提供了理论基础。对于钢骨混凝土梁当钢骨上翼缘处于截面受压区,且配置一定数量构造钢筋时,钢骨与混凝土能保持较好的共同工作状态。
Steel reinforced concrete composed of internal steel and encased concrete can improve the integral stiffness and plane torsional-buckling performance,which give full play to the strength of steel. Compared with pure steel structure,steel reinforced concrete structure has higher stiffness and damping so as to better control structural deformation. Through the analysis of welding principle and technology of electrical resistivity welding,the welding process was divided into three stages,respectively was prepressing,welding and tempering. Through setting parameter in different stages to ensure that the welding joint performance of welded reinforcement was higher than original reinforced materials,and a series of mechanical experiments also proved that. Meanwhile,according to the metallographic analysis,it was concluded that the root causes to improve the performance of welded joint was metal mainly by acicular martensite steel at the welds,welds around was given priority to with ferrite and austenite,which provided a theoretical basis for the replacement of traditional stirrup. Both steel ribs and concrete could maintain a stable co-working status when the upper flange of the steel ribs was located in cross-section compression area and set up a certain number of constructional reinforcement.
出处
《钢结构》
北大核心
2016年第9期80-84,共5页
Steel Construction
关键词
钢骨混凝
箍筋
土电阻压接焊
焊接工艺
金相分析
steel reinforced concrete
stirrup
soil electrical resistivity welding
welding process
metallographic analysis
