In this paper, a frame structure based on the locally resonant (LR) mechanism of phononic crystals (PCs) is designed on account of the wide application of frame structures in high-rise buildings, and the band structures, displacement fields of eigenmodes, and transmission power spectrums of corresponding finite structure are calculated by finite element (FE) method. Numerical results and further analysis demonstrate that a full band gap with low starting frequency can be opened by the frame structure formed by periodically combining soft and hard materials, and the starting frequency can be further lowered with the adjustment of corresponding geometric parameters, which provides a theoretical basis for the studies on vibration insulation and noise reduction of high-rise buildings.
The stiffness of structural elements (columns, beams, and slabs) significantly contributes to the overall stiffness of reinforced concrete (RC) high-rise buildings (H.R.B.s) subjected to earthquake. In order to investigate what percentage each type of element contributes to the overall performance of an H.R.B. under seismic load, the stiffness of each type of element is reduced by 10% to 90%. A time history analysis by SAP2000 was performed on thirteen 3D models of 12-story RC buildings in order to illustrate the contribution of column stiffness and column cross sections (rectangular or square), building floor plans (square or rectangular), beam stiffness and slab stiffness, on building resistance to an earthquake. The stiffness of the columns contributed more than the beams and slabs to the earthquake resistance of H.R.B.s. Rectangular cross-section columns must be properly oriented in order for H.R.B.s and slender buildings to attain the maximum resistance against earthquakes.
Metropolia Barcelońska należy do pierwszej dziesiątki aglomeracji miejsckich Europy. Uwarunkowania geograficzne i przyrodnicze - położenie pomiędzy morzem, a równolegle do niego przylegającymi, zalesionymi pasmami górskimi rozdzielonymi szerokimi dolinami rzek miały znaczący wpływ na uformowanie się hynrydowej struktury urbanistycznej. Jej sercem pozostaje założona przez Fenicjan u stóp wzgórza Montjuic, w naturalnym porcie Barcelona, która przez ponad dwa tysiące lat rozwijała się wraz z sąsiednimi miejscowościami wypełniając tkankę miejską coraz to nowe fragmenty naturalnego krajobrazu. Monumentalne gmachy i budynki wysokie, powstające we wszystkich okresach historycznych, informowały o potędze miasta, wyznaczając miejsca ważne zarazem dla jego kompozycji urbanistycznej i statusu. Ostatnie dekady nie przyniosły w tej tendencji rewolucyjnych zmian. Zmieniły się natomiast formy architektoniczne tych najbardzej emblematycznych w skali metropolii budowli.
The growth in high-rise building construction has increased the need for hybrid reinforced concrete and steel structural systems. Columns in buildings are the most important elements because of their seismic resistance. Reinforced concrete (RC) columns and steel columns were used herein to form hybrid structural systems combining their distinct advantages. Eleven 3D building models subjected to earthquake excitation with reinforced concrete beams and slabs of 12 floors in height and with different distributions of mixed columns were analyzed by the SAP2000 software in order to investigate the most suitable distributions of a combination of reinforced concrete and steel columns. Top displacements and accelerations, base normal forces, base shear forces, and base bending moments were computed to evaluate the selected hybrid structural systems. The findings are helpful in evaluating the efficiency of the examined hybrid high-rise buildings in resisting earthquakes.