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In this study, the effects of impregnation materials di‐ammonium phosphate, aluminium sulphate, potassium carbonate, calcium chloride, zinc chloride on combustion properties of 3 ply laminated veneer lumbers (LVL) produced from Walnut (Juglans regia L.) using phenol–formaldehyde (PF), poly (vinyl acetate) have been investigated. The pressure‐vacuum method was used for impregnation process. Combustion test was performed according to the procedure of ASTM‐E 69 standards. During the test, mass reduction, temperature and released gas (CO, NOX, SO2, O2) were determined every 30 s. As a result, zinc chloride was found to be the most successful fire‐retardant chemical in LVL at PF adhesive. Since it diminishes combustion, the fire retardant of LVL produced from walnut using PF adhesive can be advised. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
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Connections for composite concrete slab and LVL flooring systems 总被引:1,自引:1,他引:0
Composite concrete slab and timber flooring systems are commonly used in many parts of the world to exploit the high strength-to-weight
ratio of timber and the good acoustic separation provided by concrete floor slabs. This paper describes the results of an
experimental programme that investigated the suitability of a range of connectors to transfer shear between a concrete slab
and a laminated veneer lumber (LVL) beam. Shear tests on reduced scale specimens were performed with the aim of comparing
the strength, stiffness, and post-peak performance of different connectors such as round and rectangular concrete plugs with
and without screw and steel pipe reinforcement, proprietary (SFS) screws, coach screws with different diameters, sheet brace
anchors, and framing brackets. The rectangular concrete plug reinforced with a coach screw was found to provide the greatest
stiffness and strength, as well as favourable post-peak behaviour. Such a system can be used for cost-effective composite
floor systems due to its efficient cost-to-capacity ratio, which reduces the number of connectors needed along the beam axis
to achieve the composite action. 相似文献
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工程木是指经过工程设计而生产出来的木质工程材料,比普通方木具有更高的强度、硬度和刚度,在我国建筑工程中的应用日益广泛.针对目前主要的工程木产品阐述其在我国建筑中的应用前景,为工程设计提供一定的参考. 相似文献
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对速生杨木制作的单板层积材(Laminated Veneer Lumber,简称LVL)的各项材料性能指标进行测试,将测试验值按《木结构设计规范》确定设计值方法换算,结果表明杨木LVL可作结构材使用. 相似文献
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The Advanced Geometry Unit (AGU) at Arup, founded by Cecil Balmond and Charles Walker, has become synonymous with a highly mathematical, topological approach to architecture. It has, however, collaborated on some of the most exciting experimental fabric structures of recent years, including Anish Kapoor's Marsyas at Tate Modern and Rem Koolhaas's Cosmic Egg at the Serpentine Gallery. Here, the unit's Tristan Simmonds, Martin Self and Daniel Bosia describe how the AGU has progressed research into textile techniques that encompass tailored biomorphic forms alongside knot diagrams. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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