Experimental response of an asymmetric, one-story building model to an idealized, transient ground motion*

1943 ◽  
Vol 33 (2) ◽  
pp. 91-119
Author(s):  
R. S. Ayre
Keyword(s):  
Ground Motion ◽  
Building Model ◽  
Experimental Response ◽  
Story Building

Experimentally determined dynamic shears in a sixteen-story model*

1938 ◽  
Vol 28 (4) ◽  
pp. 269-311 ◽  
Author(s):  
Lydik S. Jacobsen ◽  
Robert S. Ayre
Keyword(s):  
Dynamic Behavior ◽  
Ground Motion ◽  
Fundamental Mode ◽  
Current Practice ◽  
Office Building ◽  
Design Rules ◽  
Higher Modes ◽  
Building Model ◽  
Story Model ◽  
Story Building

Summary The paper discusses the dynamic behavior of a 16-story building model representing an idealized office building. The model is subjected to “standardized” types of ground motion, and the dynamic shears between adjacent stories are measured. The rigidity of the first story is varied so that the effect of a “flexible” first story on the dynamic shears is demonstrated. It is concluded that flexibility in the first story decreases the dynamic shears everywhere in the building when the same degree of “tuning in” with the ground-motion frequency is postulated. Moreover, it is concluded that current practice design rules are in fair agreement with the shears that may be expected when the building is vibrating in or near its fundamental mode, but that current practice does not allow for shears due to the higher modes unless a comparatively flexible first story is used.

Earthquake induced floor accelerations on a high-rise building: Scale model tests on a shaking table

2021 ◽  
Author(s):  
Fabio Rizzo ◽  
Alessandro Pagliaroli ◽  
Giuseppe Maddaloni ◽  
Antonio Occhiuzzi ◽  
Andrea Prota
Keyword(s):  
Soil Structure ◽  
Shaking Table ◽  
Soil Structure Interaction ◽  
Scale Model ◽  
Structural Elements ◽  
Shaking Table Tests ◽  
Building Model ◽  
High Rise ◽  
High Rise Building ◽  
Story Building

<p>The paper discusses results of shaking table tests on an in-scale high-rise building model. The purpose was to calibrate a dynamic numerical model for multi-hazard analyses to investigate the effects of floor acceleration. Accelerations, because of vibration of non-structural elements, affect both the comfort and safety of people. The research investigates the acceleration effects of both seismic and wind forces on an aeroelastic in-scale model of a multi-story building. The paper discusses the first phase of experiments and gives results of floor accelerations induced by several different base seismic impulses. Structural analyses were first performed on the full-scale prototype to take soil-structure interaction into account. Subsequently the scale model was designed through aeroelastic scale laws. Shaking table experiments were then carried out under different base accelerations. The response of the model and, in particular, amplification of effects from base to top are discussed.</p>

Simulation and analysis of a vertically irregular building subjected to near-fault ground motions

2020 ◽  
Vol 36 (3) ◽  
pp. 1485-1516
Author(s):  
Jui-Liang Lin ◽  
Wen-Hui Chen ◽  
Fu-Pei Hsiao ◽  
Yuan-Tao Weng ◽  
Wen-Cheng Shen ◽  
...  
Keyword(s):  
Numerical Model ◽  
Seismic Response ◽  
Ground Motion ◽  
Ground Motions ◽  
Far Field ◽  
Near Fault ◽  
Study Results ◽  
Rc Building ◽  
Near Fault Ground Motion ◽  
Story Building

A shaking table test of a three-story reinforced concrete (RC) building was conducted. The tested building is vertically irregular because of the first story’s elevated height and the third story’s added RC walls. In addition to far-field ground motions, near-fault ground motions were exerted on this building. A numerical model of the three-story building was constructed. Comparing with the test results indicates that the numerical model is satisfactory for simulating the seismic response of the three-story building. This validated numerical model was then further applied to look into two issues: the effective section rigidities of RC members and the effects of near-fault ground motions. The study results show the magnitude of the possible discrepancy between the actual seismic response and the estimated seismic response, when the effective section rigidities of the RC members are treated as in common practice. An incremental dynamic analysis of the three-story RC building subjected to one far-field and one near-fault ground motion, denoted as CHY047 and TCU052, respectively, was conducted. In comparison with the far-field ground motion, the near-fault ground motion is more destructive to this building. In addition, the effect of the selected near-fault ground motion (i.e. TCU052) on the building’s collapse is clearly identified.

Design for seismic torsional forces

1984 ◽  
Vol 11 (2) ◽  
pp. 150-163 ◽  
Author(s):  
J. L. Humar
Keyword(s):  
Ground Motion ◽  
Analytical Study ◽  
Critical Evaluation ◽  
Building Code ◽  
Rotational Ground Motion ◽  
Building Model ◽  
Design Basis ◽  
Building Models ◽  
Adequate Design ◽  
Code Provisions

An analytical study of the responses of a single storey and a multistorey building model to a combined translational and rotational ground motion is presented. The models, which are assumed to be elastic, are eccentric about one plan direction but are symmetric about the perpendicular direction. The ground excitations are represented by idealized spectra.A critical evaluation is made of the torsion provisions of the National Building Code of Canada. It is shown that the code provisions, while not necessarily nonconservative, are somewhat difficult to apply for multistorey buildings. An alternative provision for design eccentricity is proposed. The forces obtained by the use of the proposed method are compared with the analytical results of single storey and multistorey building models and are shown to provide an adequate design basis.

Three-dimensional dynamic analyses of two Colombian high-rise buildings

1969 ◽  
Vol 59 (4) ◽  
pp. 1495-1515
Author(s):  
Gary C. Hart
Keyword(s):  
Ground Motion ◽  
Three Dimensional ◽  
Office Building ◽  
Mode Shapes ◽  
Concrete Frame ◽  
Building Model ◽  
High Rise ◽  
Building Models ◽  
Dynamic Analyses ◽  
Seismograph Station

Abstract The actual earthquake damage in two high-rise buildings in Bogota, Colombia, is compared with predicted response of four three-dimensional analytic building models. Three building models of the 24-story steel frame Bank of Bogota and one of the 29-story concrete frame Bavaria Office Building are considered. Periods and mode shapes are calculated for each building model. Maximum interstory displacements, absolute roof accelerations, story shears, and torques are calculated in each building model for three well-recorded earthquakes, one being a July 1967 earthquake in Colombia, as recorded at a nearby Bogota seismograph station. In all earthquakes, both components of ground motion were applied simultaneously.

GRAVITY EFFECTS ON EARTHQUAKE RESPONSE OF A FLEXURE BUILDING: A SHEAR BUILDING COMPARISON

2010 ◽  
Vol 10 (02) ◽  
pp. 187-203
Author(s):  
ERIC AUGUSTUS TINGATINGA ◽  
HIDEJI KAWAKAMI ◽  
HIDENORI MOGI
Keyword(s):  
Natural Frequency ◽  
Ground Motion ◽  
Nonlinear Effects ◽  
Degree Of Freedom ◽  
Small Displacement ◽  
Building Model ◽  
Mdof Systems ◽  
Gravity Effects ◽  
The Difference ◽  
Shear Building

An analytical building model including the nonlinear effects caused by gravity is presented in this paper. Governing equations are derived for both single-degree-of-freedom (SDOF) and multi-degree-of-freedom (MDOF) models with large displacements taken into account, and solutions are obtained by direct integration and modal analysis. The response of typical structures subjected to harmonic ground excitation was expressed in exact and approximate forms, compared with the response of an equivalent shear building. Numerical examples show that while gravity generally decreases the natural frequency of elastic SDOF systems with small displacement approximations, actual natural frequency increases with ground motion. The difference in the natural frequency and response of MDOF systems to the equivalent shear building is not only due to gravity, but also caused by the geometry of the structure. Exact solution shows that the frequency varies with ground motion amplitude.

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