A Comparison of Force Balance and Pressure Integration Techniques for Predicting Wind-Induced Responses of Tall Buildings

2006 ◽  
Author(s):  
Calin Dragoiescu ◽  
Jason Garber ◽  
K. Suresh Kumar
Keyword(s):  
Tall Buildings ◽  
Force Balance ◽  
Induced Responses ◽  
Integration Techniques

A New Generation of Tools for the Design of Tall Buildings Subjected to Wind Loads

2008 ◽  
Author(s):  
Emil Simiu ◽  
Rene D. Gabbai
Keyword(s):  
Structural Engineering ◽  
Tall Buildings ◽  
Building Envelope ◽  
Force Balance ◽  
Wind Loads ◽  
Individual Member ◽  
Engineering Practice ◽  
Wind Effects ◽  
Uncertainty Estimates ◽  
Internal Forces

Current approaches to the estimation of wind-induced wind effects on tall buildings are based largely on 1970s and 1980s technology, and were shown to result in some cases in errors of up to 40%. Improvements are needed in: (i) the description of direction-dependent aerodynamics; (ii) the description of the direction-dependent extreme wind climate; (iii) the estimation of inertial wind effects induced by fluctuating aerodynamic forces acting on the entire building envelope; (iv) the estimation of uncertainties inherent in the wind effects; and (v) the use of applied wind forces, calculated inertial forces, and uncertainty estimates, to obtain via influence coefficients accurate and risk-consistent estimates of wind-induced internal forces or demand-to-capacity ratios for any individual structural member. Methods used in current wind engineering practice are especially deficient when the distribution of the wind loads over the building surface and their effects at levels other than the building base are not known, as is the case when measurements are obtained by the High-Frequency Force Balance method, particularly in the presence of aerodynamic interference effects due to neighboring buildings. The paper describes a procedure that makes it possible to estimate wind-induced internal forces and demand-to-capacity ratios in any individual member by: developing aerodynamic and wind climatological data sets, as well as aerodynamic/climatological directional interaction models; significantly improving the quality of the design via rigorous structural engineering methods made possible by modern computational resources; and properly accounting for knowledge uncertainties. The paper covers estimates of wind effects required for allowable stress design, wherein knowledge uncertainties pertaining to the parameters that determine the wind loading are not considered, as well as estimates required for strength design, in which these uncertainties need to be accounted for explicitly.

Wind-induced responses of super-tall buildings with various atypical building shapes

2014 ◽  
Vol 133 ◽  
pp. 191-199 ◽  
Author(s):  
Y.C. Kim ◽  
Y. Tamura ◽  
H. Tanaka ◽  
K. Ohtake ◽  
E.K. Bandi ◽  
...  
Keyword(s):  
Tall Buildings ◽  
Induced Responses

Wind-induced responses of tall buildings under combined aerodynamic control

2018 ◽  
Vol 175 ◽  
pp. 86-100 ◽  
Author(s):  
Chaorong Zheng ◽  
Yu Xie ◽  
Mahram Khan ◽  
Yue Wu ◽  
Jing Liu
Keyword(s):  
Tall Buildings ◽  
Induced Responses ◽  
Aerodynamic Control

Dynamic Wind Load Combination for a Tall Building Based on Copula Functions

2017 ◽  
Vol 17 (08) ◽  
pp. 1750092 ◽  
Author(s):  
M. F. Huang ◽  
Zhibin Tu ◽  
Qiang Li ◽  
Wenjuan Lou ◽  
Q. S. Li
Keyword(s):  
Wind Tunnel Test ◽  
Time History ◽  
Tall Buildings ◽  
Wind Load ◽  
Probabilistic Methods ◽  
Force Balance ◽  
Wind Loads ◽  
Exceedance Probability ◽  
Copula Functions ◽  
Combination Rules

Dynamic wind loads on tall buildings can be decomposed into three components, i.e. two translational components and one torsional component. When one component reaches its maximum, the other two components have low probability to take their maximum values. It is common to use combination coefficients for estimating the mean extremes of linearly combined wind loads. The traditional design practice for determining wind load combinations relies partly on some approximate combination rules and lacks a systematic and reliable method. Based on the high frequency force balance (HFFB) testing results, wind loads can be acquired in terms of time history data, which provides necessary information for the more rigorous determination of combination coefficients by probabilistic methods. In this paper, a 3D copula-based approach is proposed for determining the combination coefficients for three stochastic wind loads associated with a specific exceedance probability and a set of 3D realizable equivalent static wind loads (ESWLs) on tall buildings. Using the measured base moment and torque data by the HFFB wind tunnel test, a case study is presented to illustrate the effectiveness of the proposed framework to determine the dynamic wind load combinations and associated 3D realizable ESWLs on a full-scale 60-story building.

scholarly journals Structural Improvements for Tall Buildings under Wind Loads: Comparative Study

2017 ◽  
Vol 2017 ◽  
pp. 1-19 ◽  
Author(s):  
Nicola Longarini ◽  
Luigi Cabras ◽  
Marco Zucca ◽  
Suvash Chapain ◽  
Aly Mousaad Aly
Keyword(s):  
Comparative Study ◽  
Tall Buildings ◽  
Force Balance ◽  
Wind Loads ◽  
Wind Tunnel Testing ◽  
Optimal Balance ◽  
Mass Damper ◽  
Wind Actions ◽  
Design Loads ◽  
Italian Design

The behavior of a very slender building is investigated under wind loads, to satisfy both strength and serviceability (comfort) design criteria. To evaluate the wind effects, wind tunnel testing and structural analysis were conducted, by two different procedures: (i) Pressure Integration Method (PIM), with finite element modeling, and (ii) High Frequency Force Balance (HFFB) technique. The results from both approaches are compared with those obtained from Eurocode 1 and the Italian design codes, emphasizing the need to further deepen the understanding of problems related to wind actions on such type of structure with high geometrical slenderness. In order to reduce wind induced effects, structural and damping solutions are proposed and discussed in a comparative study. These solutions include (1) height reduction, (2) steel belts, (3) tuned mass damper, (4) viscous dampers, and (5) orientation change. Each solution is studied in detail, along with its advantages and limitations, and the reductions in the design loads and structural displacements and acceleration are quantified. The study shows the potential of damping enhancement in the building to mitigate vibrations and reduce design loads and hence provide an optimal balance among resilience, serviceability, and sustainability requirements.

Assessment of wind-induced responses for offshore jacket platforms based on high frequency force balance tests

2021 ◽  
Vol 26 (4) ◽  
pp. 357
Author(s):  
Yipei Zhao ◽  
Ao Huang ◽  
Liping Sun ◽  
Benrui Zhu ◽  
Hongbing Liu ◽  
...  
Keyword(s):  
High Frequency ◽  
Force Balance ◽  
Induced Responses ◽  
Balance Tests

Assessment of wind-induced responses for offshore jacket platforms based on high frequency force balance tests

2021 ◽  
Vol 26 (4) ◽  
pp. 357
Author(s):  
Hongbing Liu ◽  
Guoming Chen ◽  
Liping Sun ◽  
Benrui Zhu ◽  
Ao Huang ◽  
...  
Keyword(s):  
High Frequency ◽  
Force Balance ◽  
Induced Responses ◽  
Balance Tests

EFFECT OF HEIGHT AND ORIENTATION OF INTERFERING BUILDINGS ON WIND LOADS ON TALL BUILDINGS

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Bharat Chauhan ◽  
Ashok Ahuja
Keyword(s):  
Wind Tunnel ◽  
Research Work ◽  
Tall Buildings ◽  
Relative Orientation ◽  
Force Balance ◽  
Wind Loads ◽  
Wind Tunnel Experiments ◽  
Cross Sectional ◽  
Sectional Shape ◽  
Component Force

The research work presented in this paper investigates the effect of interference on wind loads on a tall building (instrumented building) having rectangular cross-sectional shape due to the presence of two interfering buildings close to the instrumented building. The effect of interference on the instrumented building is studied with the variation of height and relative orientation of the interfering buildings with respect to the instrumented building. Wind tunnel experiments are undertaken using five component force balance load cell and the results are reported in the form of X-Y plots. The effect of interference in both shielding as well as enhancing the wind load on the instrumented building, is seen to increase with the increase in the height of the interfering building. Negative drag force is also observed in few cases where shielded part of the instrumented building is large. Value of torsion on the instrumented building is observed to be as high as ten times of that in the isolated case.

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