摘要
基于现有分层装配柔性支撑框架,提出改进的铰接支撑双重抗震改进型轻钢框架体系.外墙转角或边墙处采用贯通式边柱,结构内部采用柱分层、梁贯通式结构设计.内部分层立柱之间设置柔性交叉支撑提供结构的初始抗侧刚度,贯通式边柱与水平贯通梁刚性或半刚性连接形成外围框架,提供后继抗侧储备并形成第2道抗侧防线.采用理论分析方法得到改进型框架梁、柱、支撑等构件初步设计方法,并基于Pushover分析改进型框架弹塑性抗侧承载性能和关键结构参数影响规律.该结构传力机制清晰,具备多重抗侧承载机制,并可基于结构力学方法有效得到结构设计准则.柔性支撑在距边柱一定距离后其位置变化不影响结构抗侧承载性能.内部分层立柱节点刚度对结构抗侧性能影响较小,实际设计中可采用全螺栓连接或限位铰接.边框梁柱连接刚度将影响外围框架刚度和结构失效机制,实际设计中宜采用加劲型螺栓连接以保证有足够的抗弯刚度.体系中各节点均可在保障结构性能条件下采用螺栓连接以实现全装配化建造.
An enhanced hinged-brace dual-resistance light steel frame system was proposed based on the current design of layered assembly brace frame systems.Columns located at the corner of the wall or along the sidewall remain the vertically continuous construction.The interior structure adopts the through-beam layered-column design.Flexible cross braces are set between the internal layered columns to provide the initial lateral structural stiffness.The horizontal through beams are rigidly or semi-rigidly connected to the continuous side columns to form the peripheral frame,providing the subsequent lateral force resistance.This leads to the formation of the second lateral seismic defense.Theoretical analysis was performed to obtain the preliminary design method of beams,columns,and braces in the improved frame.The elastic-plastic lateral force resistance and influences of critical structural factors were analyzed based on Pushover simulations.The structure possesses a clear force transfer mechanism and multiple lateral load resistance mechanisms.The structural design criteria can be effectively obtained based on the structural mechanics method.Given a certain distance from the side column,the position changes of the hinged brace do not affect the lateral load resistance.The connection stiffness of internal layered columns has minimal influence on the structural lateral performance,allowing for the full bolted or hinge joints to be applied.The bending stiffness of the through-beam to the side column connection can impact the structural stiffness of the peripheral frame and further influence the failure mechanism of the entire structure.Stiffened bolted connections were proposed to ensure sufficient connection stiffness in practical structural designs.All connections in the improved frame can employ bolted connections to achieve the full assembly construction while retaining satisfactory structural mechanical per-formance.
作者
余玉洁
韦权飞
王霄翔
胡婉颖
Yu Yujie;Wei Quanfei;Wang Xiaoxiang;Hu Wanying(School of Civil Engineering,Central South University,Changsha 410075,China;Hunan Construction Investment Co.,Ltd.,Changsha 410004,China;Hunan Construction Engineering Group Co.,Ltd.,Changsha 410004,China)
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2024年第4期343-354,共12页
Journal of Tianjin University：Science and Technology
基金
国家自然科学基金资助项目(52278231)
湖南省自然科学基金资助项目(2022JJ20073)
湖南省科技创新计划资助项目(2022RC1185)
长沙市自然科学基金资助项目(kq2202100).
