建筑主结构外部装饰抗震加固方法研究

Study on Seismic Reinforcement Method for External Decoration of Main Structure of Buildings

研究新的建筑主结构外部装饰抗震加固方法,从地震荷载与风荷载两方面考虑建筑主结构外部装饰抗震加固,以某市超高层建筑为研究原型,利用STRAND 7有限元软件构建包括外部装饰条与附近建筑的空间几何模型,选取EI Centro波与LMA Kobe波以及一条Ⅲ类场地的人工地震波作为工况输入;采用标准大涡模拟研究原型模拟流场的湍流效应,求解不同风向角下的流场分布,获取建筑主结构外部装饰所受的风荷载。仿真分析结果显示,外部装饰条的切向风荷载系数分布存在拐角区域大、平顺区域小的特征;原型结构所受风荷载受斜风向影响高于水平风向,外部装饰以低于10%的幅度提升原型结构所受风荷载,均布布置的外部装饰会降低整体结构的风荷载;8度罕遇工况输入下,北向纵墙中部外部装饰最大位移角为1/42,最大位移值约为9.5 mm,变形较低,且建筑主结构南向最大层间位移角为1/177,位移值约为8.5 mm,震后残余变形小,抗震效果较好。

The paper studies the new method of seismic strengthening of the external decoration of the main structure of the building,and considers the seismic strengthening of the external decoration of the main structure of the building from two aspects of seismic load and wind load.Taking a city's super high-rise building as the research prototype,the finite element software STRAND 7 was used to construct a spatial geometric model including external decorative strips and nearby buildings with the EI Centro wave and LMA Kobe wave and an artificial seismic wave of a typeⅢsite selected as the working condition input;the standard large eddy simulation was used to study the turbulence effect of the simulation flow field,and the flow field distribution at different wind directions was solved to obtain the wind load on the exterior decoration of the main structure.Simulation results show that the tangential wind load coefficient distribution of the exterior decorative strip has the characteristics of large corner area and small smooth area;the influence of oblique wind direction on wind load of the prototype structure is higher than that of the horizontal wind direction.The external decoration increases the wind load on the prototype structure by less than 10%.The uniformly distributed external decoration will reduce the wind load on the overall structure.Under 8-degree rare working condition input,the maximum displacement angle of the external decoration in the middle of the northward vertical wall is 1/42,and the maximum displacement value is about 9.5 mm with relatively low deformation,and the maximum inter-layer displacement angle of the main structure in the south direction is 1/177 with the displacement value of 8.5 mm.The residual deformation after the earthquake is small,and the seismic effect is good.