PARAMETRIC STUDY OF THE PLAN LAYOUT OF LOAD-BEARING WALLS IN MONOLITHIC CROSS-WALL BUILDINGS WITH A FLEXIBLE FIRST STOREY

Abstract

The study is devoted to a numerical assessment of the influence of the plan layout of load-bearing walls on the seismic response of a monolithic reinforced concrete cross-wall structural system building with a flexible first story, which is typical of residential buildings in seismic regions of the Republic of Kazakhstan. A three-dimensional model of a B1+G+5 building was developed in LIRA-SAPR 2024 using the response spectrum method for seismic intensities of 7, 8, and 9 points. Four analytical models were considered, differing in the share of exterior longitudinal walls along the X-axis direction (0, 20, 40, and 60%), while keeping the geometric, structural, and material parameters unchanged, including the presence of a flexible first story. The analysis was carried out in terms of maximum horizontal displacements, plan regularity indicators, story shear forces, and the distribution of story stiffness. It was established that an increase in the share of longitudinal walls contributes to a reduction in horizontal displacements and the torsional component of the response, improves the plan regularity of the building, and changes the pattern of force distribution over the height. The decisive role of the rational arrangement of load-bearing walls in ensuring the seismic resistance of cross-wall buildings with a flexible first story is demonstrated.