Influence of Torsion Effect in Bottom Fixed High-rise Structure with Basements

Domestic codes allowed high-rise buildings fixed on bottom in limiting lateral stiffness ratio and additional tectonic measures.However there was still error in torsion effect even when the stiffness ratio met the codes.The influence of torsion effect in bottom fixed by structural modeling according stiffness ratio,period and deflection would be analyzed.In the end suggesting the calculation of stiffness ratio,asking for a higher limit of lateral stiffness ratio and adding request of torsional stiffness ratio in torsion effect.