NUMERICAL STUDY OF VARIATIONS AXIAL FORCE COLUMN OF STEEL STRUCTURES IN ELASTIC CONDITION DUE TO VERTICAL EARTHQUAKE LOAD CONSIDERING THE EFFECT OF PROPAGATION AND BOUNCE

• Main Author: Imam Muflih, Moch
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/37010
• Institution: Institut Teknologi Bandung

Numerical studies were carried out on three different steel structures of 10 DOF, 20 DOF and 30 DOF. The steel dimension is set by the optimum that designed based on the applicable standards in Indonesia. At each 3.5 meter elevation there is a lumped mass whose approached with a mass of tributary areas of a building with a floor area of 6 x 6 m2. What you want to know from this study is how the influence of the presence of a vertical direction earthquake on the axial force press on the column. In this study, a step-by-step numerical analysis Integration Wilson-? Modification was carried out with simulation programming with Matlab R2013b on column structures with multi degrees of freedom (MDOF) which were subjected to field vertical direction earthquake loads that occurred in 2007 in the Mentawai islands against with 3 type of analysis method of vertical earthquake testing, classical analysis (seismic velocity propagation on building structures is assumed to be infinite value (vc = ?), calculating earthquake energy propagation (seismic velocity propagation on building structures is assumed to be finite values (0 <vc <?), and take into account the propagation of seismic energy as well as the reflection of force on each centralized mass (0 <vc <?; 0 <e <1). The results of the study of column compressive axial force based on two loading in design (service load and earthquake load design) with 3 methods of analysis of vertical earthquake testing in the column resulted in a column capacity ratio still> 1. This means that the column can still carry vertical earthquake forces that occur. Increase reduction of column capacity factor occurs when the largest effect of reflection and reduction is present on a 20-story structure compared to 30-story. This indicates that vertical earthquake forces will be dissipated along with the higher structure.