Comparative analysis of fixed base and isolated structure in "l" shaped plan with time history analysis based on ASCE 7-16

Abstract

An "L" shaped plan is often being chosen for residential, office, or hospital, whereas this configuration plan does not meet structural torsion requirement. This selection is done by the consideration of limited area and architectural needs, e.g. hospital needs for ventilation. Since the development of technology is very rapid this era, an innovation emerges beyond conventional solution, in terms of base isolation. In this paper, the selected research object is known as lead rubber bearing (LRB) with damping ratio 27%. To fulfill the research of Lshaped, the variation of length of the wings are proposed. Six models are functioned as office buildings in 6-story tall; three fixed base models are designed with dual system and another three isolated models are design using linear distribution lateral forces according to ASCE 7-16 code. Three-dimensional nonlinear time history analysis for isolated models is performed and will involve seven pairs of ground motions, which are matched to MCER target spectra of Jakarta in soft soil condition. In the end, the non-linear dynamic main responses of isolated structure may provide better and optimal results. In addition, estimated cost for design phase of pre-construction can be done by the assessment of rebar ratio and equivalent thickness of concrete, known from the results of this study.