钢-混凝土组合空腹板架结构地震响应研究

Seismic response study of steel-concrete composite open-web plate frame

钢-混凝土组合空腹板架是一种较新的组合结构形式。考虑9度设防烈度下的多遇地震情况,对空腹板架结构进行了地震响应分析,结果表明,该类结构的竖向地震响应值比响应的水平地震响应值大1至2个数量级,因此,地震作用下,可仅考虑竖向地震作用。在此基础上,采用振型分解反应谱法详细分析结构竖向地震作用下的荷载组合效应,同时,研究了竖向地震作用下结构的主要组成构件——钢肋、钢管剪力键、混凝土板的受力特征及分布。研究表明,在设计荷载较大(不小于4kN/m2)时,竖向地震作用下的荷载组合效应对截面设计不起控制作用;竖向地震作用下,剪力键为受剪构件、钢肋为拉弯或压弯构件、混凝土板为受弯构件。研究为组合空腹板架的抗震设计及构造设计提供了可靠依据。

Steel-concrete composite open-web plate frame is a new type of composite structure.The seismic responses of the composite structures were analyzed due to the situation of frequent seismic action in 9 degrees fortification area.The analyzed results show that response under vertical seismic action is much more intensity than that of horizontal seismic action.So the effects of combined loads under vertical seismic action on this frame were analyzed with mode superposition response spectrum method.Mechanical properties and distribution of the structure components(steel ribs,shear key,concrete slab) subjected to vertical seismic action were also researched.Study shows that when design live load is larger(≥4kN/m2),load combination response including vertical seismic action may not control the section design;shear key is shear component,steel rib is tension-bending or compression-bending component,and concrete slab is bending component.This research can provide reference for steel-concrete composite open-web plate frame on seismic design and details design.