1998 Fiscal Year Final Research Report Summary
Mechanism of aerodynamic control in the strong wind and its applicability to an extremely high rise building
| Project/Area Number |
09555173
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Building structures/materials
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
TAMURA Tetsuro Tokyo Institute of Technology Interdisciplinary Graduate School of Science & Engineering Professor, 大学院・総合理工学研究科, 教授 (90251660)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Masayasu Kajima Corporation Kajima Technical Research Institute, Senior Research Engineer, 技術研究所, 主任研究員(研究職)
ITOH Yoshiaki Tokyo Institute of Technology Interdisciplinary Graduate School of Science & Eng, 大学院・総合理工学研究科, 助手 (40272702)
WADA Akira Tokyo Institute of Technology Materials and Structures Laboratory, Professor, 応用セラミックス研究所, 教授 (90158684)
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| Project Period (FY) |
1997 – 1998
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| Keywords | atmospheric boundary layer / storng wind / a tall building / aerodynamic control / wind tunnel experiment / thermal stratification / numerical simulation / turbulence effect |
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| Research Abstract |
The purpose of this study is to develop the method of the reduction in wind loading on a tall building which is higher than the depth of the atmospheric boundary layer by means of modification of the corner shape of the building. First we discuss the performance for the reduction of aerodynamic forces on a type of square section cylinder due to corner-cutting and corner-rounding. Wind tunnel tests were carried out in uniform and turbulent flow. After that three-dimensional incompressible flow around a square cylinder with various corner shapes are numerically simulated by direct finite difference scheme without any turbulence model. The relation between aerodynamic force and flow structures is examined in case that the approaching flow is uniform, focusing on reattachment of the separated shear layers and vortex formation in the wake. In order to clarify the mechanism of aerodynamic force reduction in various approaching flows on the basis of the above numerical results, the surface pr
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essure characteristics acting on a two- and three- dimensional cylinders in uniform and turbulent flows are investigated by means of wind tunnel tests.
Concerning the strong wind we suppose that the characteristics in the atmospheric boundary layers are quite different from those in the further upper layer. On the basis of observation data, we succeed in modeling an atmospheric boundary layer in the wind tunnel. We pay attention to the relation between the thermal stratification generated by the heaters and the turbulence generated by the blocks mounted on the floor of the wind tunnel. We confirm the validity of generated airflow and clarify the vertical structures of the atmospheric turbulence. The aerodynamic forces of a tall building model are measured in the approaching turbulent flow with thermal stratification and their characteristics are clarified. The conclusion are obtained as the available guide for wind resistant design of an extremely high rise building over the atmospheric boundary layer. Less
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Research Products
(16 results)
