Research On Seismic Performance Of Cold-formed Thin-walled Steel Composite Walls With Ply-bamboo Sheathing Panels

In order to promote the application of cold-formed thin-walled steel structures, itis necessary to investigate the seismic performance of this type of structures,especially for the cold-formed thin-walled steel composite walls.Based on the force transmission path analysis, the structural behavior ofcold-formed thin-walled steel composite shear wall which sustains and transfershorizontal and vertical load, has played a very important role in the seismicperformance of the whole structure. According to the order from the local to thewhole, a relatively comprehensive review of the studies at home and abroad on theseismic performances of wall studs, fasteners and the composite shear walls ispresented. A statistical analysis is implemented mainly based on the data of typicalshear resistance experiments results at home and abroad of cold-formed thin-walledsteel composite walls, indicating the degree of influence of sheathing boards,fasteners, steel frame, aspect ratio, opening size and loading regime. Some shearexperiments results are compared with the design guidance values of Chinese codeand the design guidance values after linear interpolation make a conservativeprediction for shear walls with large-spaced fasteners. The calculation of reliabilityindex is made with the partial safety factor for resistance given in Chinese code,showing that the design guidance values of&hinese code can’t satisf the objectivereliability index(3.2). The recalculated reliability index with partial safety factor forresistance adjusted according to a reference’s recommendation are in good agreementwith objective reliability index, while there would be a lot of work remaining to dofor a more appropriate value of partial safety factor for resistance.By applying the semi-analytical method, a calculation, which is proven accurateenough, of shear resistance of cold-formed thin-walled steel composite walls withply-bamboo sheathing panels is implemented. Comparisons are made among five ha ndcalculation methods. Easley method and simplified method made a conservativeprediction of shear resistance of composite walls and results by X-M method are insuch good agreement with experimental results that it is recommended to use inpractical engineering. Reference values of shear resistance of composite walls fromAISI specifications, Chinese code and Taiwanese code are compared withexperimental data and Taiwanese code is recommended to provide nominal shearresistance for composite walls. Plus, experiments of seven cold-formed thin-walled steel composite walls withply-bamboo sheathing panels are implemented monotonically and cyclically. Thistype of shear walls present middle-level ductility, yet capacity of energy dissipationremains to improve. Some suggestions on the seismic performance research field ofthis kind of structures system are proposed. All the statistical work and experimentsfinished in this dissertation make guiding effect on the design procedures.