Search

Longitudinal displacement of cross section of T-shaped shortleg shear wall was simplified to three parts: shear lag warping displacement, plane section bending displacement and axial displacement. Shear lag warping deformation was assumed as cubic parabola distribution along flange, and based on minimum potential energy principle, differential equations were deduced; with boundary conditions, a calculation theory for shear lag effect was established. With two T-shaped short-leg shear wall models, vertical stresses of flanges were obtained by calculation theory and finite element calculation respectively, and comparison between theoretical analysis results and numerical calculation results was made. At last, parameter analysis was carried out, and the influence of shear force, shear span ratio and height-thickness ratio on shear lag coefficient was obtained. Research shows that numerical calculation results are in good agreement with theoretical analysis results, and each parameter has different influence on shear lag coefficient. [ABSTRACT FROM AUTHOR]

As a new type of high-rise building structure system, diagridtube in tube structure is increasingly applied in high-rise building.Guangzhou West tower is the first high-rise diagrid tube intube structure in China. To study seismic performance of thestructure, elastic time-history analysis and shaking table testwere conducted. The results of elastic time-history analysis andshaking table test were in a good agreement, which verified thevalidity of the elastic time-history analysis. Dynamic characteristicsand responses of the model structure’s acceleration,displacement and strain under different intensity earthquakeaction were obtained through analysis and test. Dynamicresponses of prototype structure were deduced based on similaritylaw and shaking table test results. Research shows thatdiagrid tube structure has a small deformation under earthquakeactions; the main vibration mode is translation, whiletorsional effect is not obvious; whiplash effect has less influenceon the structure; diagrid members, diagrid nodes andshear walls at the bottom of the structure are weak parts. [ABSTRACT FROM AUTHOR]