屋顶绿化大型乔木-结构风振简化计算方法与参数影响分析  

Simplified Calculation Method and Parameter Investigation of Wind-induced Vibration of Large Arbor Structure for Roof Greening

作　　者：叶风华 YE Fenghua(Guangdong Construction Engineering Architecture Design Group Co.,Ltd.Guangzhou 510500,China;Guangdong Jianke Construction Drawing Review Co.,Ltd.Guangzhou 510010,China)

机构地区：[1]广东省广建设计集团有限公司,广州510500 [2]广东建科施工图审查有限公司,广州510010

出　　处：《广东土木与建筑》2023年第6期90-94,共5页Guangdong Architecture Civil Engineering

摘　　要：以某建筑屋顶绿植工程为背景,结合实际工程结构中大量乔木建模以及风荷载施加等问题,建立5种大型乔木群-结构风振计算模型,对比提出了大型乔木群-结构风致振动简化分析方法,结合简化模型探讨了乔木高度、种植密度等参数对结构基底剪力、倾覆弯矩、层间位移角、顶点水平位移和顶点加速度等动力响应的影响规律。结果表明,基于乔木底部轴力、剪力、弯矩时程荷载施加的结构简化风振计算方法(模型D),能有效反应大型乔木群对结构风致振动的荷载激励特征,模型D和模型A方案风振动力响应误差均在10%以内;结构风振响应随着大型乔木群高度和种植密度的增大而逐渐增大,风荷载作用下乔木群会对结构产生较大的风振效应,在实际工程设计时应引起足够重视。Taking into account the SSI effect,and referring to the arbor modeling and wind to load application problems of the actual engineering structure,five large-scale arbor group-structure wind vibration calculation models were established.The simplified analysis method of wind-induced vibration of large arbor group-structure is proposed,by comparing the five models.Combined with the simplified model,the research further studies the influence of parameters such as tree height and planting density of the dynamic response to the structure's base shear,overturning bending moment,interlayer displacement angle,vertex horizontal displacement and vertex acceleration.The results show that the model D,based on the axial load,shear force and bending moment times to load applied to the bottom of the tree,effectively reflects the load excitation characteristics of the large tree group on the wind-induced vibration of the structure.The structure's wind-induced vibration response increases with height and planting density of large tree groups.Under wind load,the arbor group can causes obvious wind vibration effect,which should be paid attention in real engineering.

关 键 词：大型乔木 框架结构 SSI效应 弹簧阻尼体系 风振响应 

分 类 号：TU312.1[建筑科学—结构工程]