Universal Equivalent Static Wind Loads of Fluctuating Wind Loads on Large-Span Roofs Based on POD Compensation

Due to their sensitivity to wind, the design of large-span roofs is generally governed by wind loads. For some flexible large-span roofs with low damping and concentrated modes, the effect of multi-mode coupling should be taken into account in computing the resonant buffeting response and equivalent static wind loads. Such an effect is considered by the modified SRSS method in this paper via the modal coupling factor. Based on the same SRSS method, the equivalent static wind loads combining the mean, background, and resonant components, are computed. Particularly, the background and resonant components are computed by the LRC method and the equivalent inertia force method considering the modal coupling effects by the modified SRSS method, respectively. The method is then applied to the computation of wind-induced vibration responses and equivalent static wind load distributions of a real large-span roof. The results show that the modal coupling effect on the resonant component can be identified by the present method with high accuracy.

Download Full-text

Equivalent Static Wind Loads on Low Rise Buildings

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.450 ◽

2013 ◽

Vol 671-674 ◽

pp. 450-453

Author(s):

Fang Hui Li ◽

Ming Gu ◽

Shi Zhao Shen

Keyword(s):

Static Load ◽

Wind Loads ◽

Load Response ◽

Equivalent Static Load ◽

Equivalent Static Wind Loads ◽

Correlation Techniques ◽

The Many ◽

Proper Orthogonal ◽

Fluctuating Wind ◽

Weighted Combination

The many low rise roof structures are sensitive to the effects of fluctuating wind load. In engineering design for the structures, spatiotemporally varying wind loads on the low rise roofs are modeled as equivalent static wind loads. In this paper, the equivalent static load of the large span roofs is formulated in terms of either a weighted combination of modal inertial load components, and the resonant and background load components that was obtained by the POD (Proper Orthogonal Decomposition) and LRC (Load –Response -Correlation) techniques.

Download Full-text

Equivalent static wind loads for stability design of large span roof structures

Wind and Structures ◽

10.12989/was.2015.20.1.095 ◽

2015 ◽

Vol 20 (1) ◽

pp. 95-115 ◽

Cited By ~ 2

Author(s):

Ming Gu ◽

Youqin Huang

Keyword(s):

Wind Loads ◽

Large Span ◽

Equivalent Static Wind Loads

Download Full-text

Constrained Least-Squares Method for Computing Equivalent Static Wind Loads of Large-Span Roofs

Advances in Structural Engineering ◽

10.1260/1369-4332.17.10.1497 ◽

2014 ◽

Vol 17 (10) ◽

pp. 1497-1515 ◽

Cited By ~ 4

Author(s):

Xuanyi Zhou ◽

Ming Gu ◽

Gang Li

Keyword(s):

Least Squares ◽

Large Scale ◽

Least Squares Method ◽

Weighting Factor ◽

Wind Loads ◽

Specific Response ◽

Computational Accuracy ◽

Constrained Least Squares ◽

Large Span ◽

Equivalent Static Wind Loads

Equivalent static wind loads (ESWL) are widely used by structural designers to determine a specific response of large-scale structures. However, structural designers usually pay attention to more responses. Thus, this study proposes a constrained least-squares method to compute the ESWL distribution that can simultaneously target multi-responses. The loading distribution is regarded as a linear combination of basic load distributions. Two forms of basic load distribution are presented herein. The magnitude range of ESWLs is limited by controlling the bounds of the participation factor, which can be regarded as a constrained linear least-squares problem. Furthermore, since only a few structural responses are usually emphasized by structural designers, weighting factor is imported to improve the accuracy of these focused responses. To verify its computational accuracy, the method is applied to a real large-span roof structure. The results of calculations show that a reasonable magnitude of ESWL distribution can be achieved. There seems to always be a balance between the number of targeted responses and computational accuracy.

Download Full-text

A Study on the Equivalent Static Wind Loadings on the Arched Roof Frames of Low-Rise Buildings in Atmospheric Boundary Layers

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.121-126.3113 ◽

2011 ◽

Vol 121-126 ◽

pp. 3113-3117

Author(s):

Jwo Hua Chen

Keyword(s):

Boundary Layer ◽

Wind Tunnel ◽

Wind Loads ◽

Design Codes ◽

Atmospheric Boundary Layers ◽

Peak Response ◽

Study Results ◽

Equivalent Static Wind Loads ◽

Wind Pressures ◽

Fluctuating Wind

A series of wind tunnel aerodynamic experiments were conducted to investigate the wind loads on the low-rise buildings with arched roofs. The wind loadings were calculated from the simultaneous measured wind pressures data over all of the models surfaces in a simulated open terrain exposure atmospheric boundary layer. With these data the equivalent static wind loads (ESWL) of fluctuating wind pressures acting on buildings frames were evaluated and the results of equivalent static wind loads were compared with the 2006 version design codes of wind loadings on buildings in Taiwan. The design codes suggested the direction of wind acting on the low-rise buildings roofs were normal to the ridges of roofs. In this study results shown, the equivalent static wind loads caused by the approaching turbulent flow may exceed the suggested values by codes. So the peak response of structural frames should be considered carefully.

Download Full-text