Aseismic Study On Staggered Truss Frame System

Staggered truss frame system is characterized by economy, efficiency and practicability and it has drawn wide attention in both engineering and academic field recently. Staggered truss frame system is more and more widely applied abroad and scholars at home are speeding relative study to put to practice. The paper, referring to foreign codes, carried out aseismic study on Staggered truss frame system by means of FEM program-ETABS, and drew the conclusion of its aseismic performance.The paper carried out elastic response spectrum analysis on Staggered truss frame system, input two strong ground motion records to carry out elastic and plastic time-history analysis. The paper compared the difference of aseismic property between 20-storeyed composite truss and 20-storeyed braced composite truss, and concluded that longitudinal brace can not only increase the rigidity but also reduce drift displacement of the first storey. In addition, the paper adopted displacement coefficiency in push-over method to obtain object displacement, and gave the failure modes of the two structures respectively.The paper also carried out elastic and plastic analysis on 8-storeyed truss and 8-storeyed Vierendeel truss. Based on the results, the two structures can both be applied to strong earthquake zone. However, the weak layer of the former structure is the first storey, while the weak layer of the latter is the 3rd storey. Besides, the failure modes of the two structures are different.For the first time in China, the paper adopted ETABS program to analyze Staggered Steel Truss. It facilitated the use of foreign design theory and expedited the application of staggered steel truss in China.