The steel consumption of steel staggered truss structure is 40 % less than other structure system. The effect of infilled walls on the structure and the structure members is important because the member size of steel staggered truss is small. The finite element analysis software ETABS was adopted to simulate the structure actual mechanics effect with 3D model. The effect of infilled wall stiffness on structure and interior members was summed up comparing with the different results based on two different models considering or ignoring the infilled wall stiffness under the load combination with seismic load. Some suggestions were made about technical parameters and steel structure design. The investigation shows that it should be analysed with 3D models according to the infilled wall stiffness, wall distribution and the wall connection method to main buildings for steel staggered truss structure. The infilled wall stiffness is big enough to affect the structure natural vibration periods and interior member forces before it is destroied by the accidental seimic load.%错列式钢桁架结构比其他结构形式可节省约40％的用钢量,结构杆件的截面比较小,填充墙刚度对结构及杆件受力性能的影响较为重要.采用有限元分析软件ETABS,建立三维空间模型模拟结构的实际受力状态,通过对错列式钢桁架结构在地震力组合荷载作用下是否计取填充墙刚度的对比分析,给出了有关技术参数及钢结构设计的建议.对于错列式钢桁架结构,应据填充墙刚度、位置及与主结构的连接方式等建立空间三维模型进行计算,分析表明,填充墙在没有因偶遇地震荷载破坏之前,具有一定的刚度,它对于结构的自振周期及杆件内力的分布有较大影响.
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