A discussion is made of the wind force coefficients for designing the main wind force resisting systems of H.P. （Hyperbolic-Paraboid）-shaped porous canopy roofs on the basis of a wind tunnel experiment. Roof models ...A discussion is made of the wind force coefficients for designing the main wind force resisting systems of H.P. （Hyperbolic-Paraboid）-shaped porous canopy roofs on the basis of a wind tunnel experiment. Roof models with a number of small circular holes were made of nylon resin using laser lithography. The porosity was changed from 0 （solid） to 0.4. Besides the porosity, the geometric parameters of the models were the rise to span ratio and slope of the roof. The overall aerodynamic forces and moments acting on a model were measured by a six-component force balance in a turbulent boundary layer. The results indicate that the porosity significantly reduces the wind loads. The design wind force coefficients for porous canopy roofs can be provided by those for solid roofs with the same configuration multiplied by a reduction factor. The proposed wind force coefficients are verified by a comparison of the load effect predicted by the proposed wind force coefficients with the maximum load effect obtained from dynamic analyses using the time history of wind force and moment coefficients. The axial forces induced in the columns supporting the roof are regarded as the load effect for discussing the design wind loads.展开更多
Wind loading on an H.P. （hyperbolic paraboloid） free roof has been investigated on the basis of a wind tunnel experiment. The roof models of 1 mm thickness were made of nylon resin using laser lithography. The param...Wind loading on an H.P. （hyperbolic paraboloid） free roof has been investigated on the basis of a wind tunnel experiment. The roof models of 1 mm thickness were made of nylon resin using laser lithography. The parameters under consideration are the rise to span ratio and slope of the roof. The overall aerodynamic forces and moments were measured by a six-component force balance in a turbulent boundary layer. Based on a combination of the lift and moment coefficients, the design wind force coefficients, CNW^＊ and CNL^＊, on the windward and leeward halves of the roof are proposed. Focus is on the column axial forces induced by wind loading as the load effect for discussing the design wind loads, assuming that the roof is rigid and supported by four comer columns. Indeed, two pairs of CNW^＊ and CNL^＊, generating the maximum tension and compression in the columns, are provided for each of the two or three wind directions parallel to the roof＇s diagonal lines. The proposed values of the wind force coefficients are compared with the specified values in the Australia/New-Zealand Standard for a limited range of rise to span ratio.展开更多
This research addresses energy consumption challenges in the design and construction of concrete freeform surface architecture.It proposes an integrated design approach centered on smooth poly-hypar surfaces,serving a...This research addresses energy consumption challenges in the design and construction of concrete freeform surface architecture.It proposes an integrated design approach centered on smooth poly-hypar surfaces,serving as a mediator to amalgamate architectural smoothness,structural stiffness,construction convenience,and building energy efficiency from the initial design phase.To testify the versatile functionality of smooth poly-hypar surfaces beyond structural loadbearing,they are employed in the design and construction of a Solar house-a prototype aimed at establishing an energy-efficient modular design and construction system for concrete-freeform surface buildings.This approach capitalizes on the unique structural and geometrical properties offered by smooth poly-hypar surfaces.By leveraging this special geometry,the methodology transcends individual stages,encompassing the entire integrated process and overcoming limitations associated with traditional sequential design strategies.It underscores the interconnected nature of design,construction,and sustainability considerations.展开更多
文摘A discussion is made of the wind force coefficients for designing the main wind force resisting systems of H.P. （Hyperbolic-Paraboid）-shaped porous canopy roofs on the basis of a wind tunnel experiment. Roof models with a number of small circular holes were made of nylon resin using laser lithography. The porosity was changed from 0 （solid） to 0.4. Besides the porosity, the geometric parameters of the models were the rise to span ratio and slope of the roof. The overall aerodynamic forces and moments acting on a model were measured by a six-component force balance in a turbulent boundary layer. The results indicate that the porosity significantly reduces the wind loads. The design wind force coefficients for porous canopy roofs can be provided by those for solid roofs with the same configuration multiplied by a reduction factor. The proposed wind force coefficients are verified by a comparison of the load effect predicted by the proposed wind force coefficients with the maximum load effect obtained from dynamic analyses using the time history of wind force and moment coefficients. The axial forces induced in the columns supporting the roof are regarded as the load effect for discussing the design wind loads.
文摘Wind loading on an H.P. （hyperbolic paraboloid） free roof has been investigated on the basis of a wind tunnel experiment. The roof models of 1 mm thickness were made of nylon resin using laser lithography. The parameters under consideration are the rise to span ratio and slope of the roof. The overall aerodynamic forces and moments were measured by a six-component force balance in a turbulent boundary layer. Based on a combination of the lift and moment coefficients, the design wind force coefficients, CNW^＊ and CNL^＊, on the windward and leeward halves of the roof are proposed. Focus is on the column axial forces induced by wind loading as the load effect for discussing the design wind loads, assuming that the roof is rigid and supported by four comer columns. Indeed, two pairs of CNW^＊ and CNL^＊, generating the maximum tension and compression in the columns, are provided for each of the two or three wind directions parallel to the roof＇s diagonal lines. The proposed values of the wind force coefficients are compared with the specified values in the Australia/New-Zealand Standard for a limited range of rise to span ratio.
基金Department of Science and Technology of Guangdong Province(Grant No.2023A1515110164)Technologies Research and Development(GrantNo.2022YFC3803800).
文摘This research addresses energy consumption challenges in the design and construction of concrete freeform surface architecture.It proposes an integrated design approach centered on smooth poly-hypar surfaces,serving as a mediator to amalgamate architectural smoothness,structural stiffness,construction convenience,and building energy efficiency from the initial design phase.To testify the versatile functionality of smooth poly-hypar surfaces beyond structural loadbearing,they are employed in the design and construction of a Solar house-a prototype aimed at establishing an energy-efficient modular design and construction system for concrete-freeform surface buildings.This approach capitalizes on the unique structural and geometrical properties offered by smooth poly-hypar surfaces.By leveraging this special geometry,the methodology transcends individual stages,encompassing the entire integrated process and overcoming limitations associated with traditional sequential design strategies.It underscores the interconnected nature of design,construction,and sustainability considerations.
