为探究足尺单板层积材(LVL)在木结构建筑中的强度,测试3种尺寸试样的抗压强度和2种尺寸试样的抗拉强度.结果表明:试件长度对其顺纹抗拉强度有显著尺寸效应,随着试样长度的增加,LVL的抗拉强度减小;试样长度和截面尺寸对其顺纹抗压强度亦有显著尺寸效应,随着长度及截面尺寸增加,抗压强度减小.

介绍了《结构胶合板》国家标准的编制原则和依据,并对标准中的技术要求、力学性能指标及试验方法等技术内容的编制依据进行了说明;以国产落叶松结构胶合板为试验材料,验证标准规定的方法和技术指标的可行性和科学性.

首次通过足尺检测的方式对不同规格杨木单板层积材性能进行检测.分析试验方法和试件规格尺寸等因素对杨木单板层积材静曲强度、弹性模量、抗压强度和抗拉强度等力学性能影响.测试结果显示:杨木单板层积材试件的幅面宽度对于材料的性能影响较大,幅面越宽试件中出现的缺陷越多,性能越低.

为促进国产落叶松结构胶合板在建筑领域的应用,参考了日本农林标准《日本农林胶合板标准-结构用胶合板》,对7种厚度落叶松结构胶合板的面外剪切强度和大试件弯曲强度进行检测,旨在提供准确的设计和施工技术参数.结果显示,7种厚度胶合板的面外剪切强度和大试件弯曲强度,超过日本标准要求的指标值.

通过对不同厚度落叶松结构胶合板力学性能的测试试验,首次给出了7种厚度落叶松结构胶合板面外剪切强度和大板弯曲强度性能,以及达到的力学性能的等级标准.

介绍了结构单板层积材国家标准的编制原则和依据,并对标准中的技术要求、力学性能指标及试验方法等技术内容进行了说明.

采用对比的方法,确定原料的质量和技术参数,研究网格芯轻体细木工板最佳构成及工艺技术,获取芯板与表板最佳复合工艺;进一步对网格芯轻体细木工板产品的物理力学性能进行研究及应用性能开发,确定产品最佳应用领域范围.

In this paper diversity factors of full scale poplar laminated veneer lumber mechanical properties eigenvalue had been tested , and diversity factors of the results had been analyzed on different production , load directions and sizes .

通过分析2个结构单板层积材国家标准,简述了结构单板层积材标准框架及技术内容对比,介绍了结构单板层积材足尺检测和评价方法及尺寸效应,为新标准的实施奠定了应用基础.

我国2002年和2003年颁布实施的GB 50206-2002《木结构工程施工质量验收规范》和GB/T50329-2002《木结构试验方法标准》及GB 50005-2003《木结构设计规范》3个木结构建筑标准规范,标志着木结构建筑将在我国重新得到认可、重视和推广应用.同时也进一步促进和拉动了我国结构用木质材料生产和加工技术及性能评价方法的引进、消化和再创新及应用.

Based on the technical information grasped by means of drafting and compiling the structural plywood standard,the present writer gives a sketch of standard framework of the structural plywood,and showed two design methods including structure( construction) design system and strength calculation system used for performance requirements and test methods of the structural plywood.

This paper explored the process of one piece formation for the bamboo bundle veneer,the vertical density profile distribution was investigated by X-ray.The mechanical and physical properties of BLVL were studied and compared with bamboo scrimber.The stability along with its discreteness of BLVL and bamboo scrimber was also characterized in the thickness and width direction.The results show that the distribution of vertical density profile(VDP) is uniform for BLVL,and the COV of the mean value of density for BLVL-Ⅰ,Ⅱis lower compared with bamboo scrimber.The mean value of MOR,MOE and shearing strength as well as its uniform properties are all superior to bamboo scrimber.The analysis of variance shows that the water absorption ratio, swelling ratio in width and thickness direction are all significantly lower than bamboo zephyr board,as well as its standard deviation,with T_H T_W.

According to the evaluation methods and standards of ASTM D5456 Standard Specification for Evaluation of Structural Composite Lumber Products and APA PRL-501 LVL Performance Standard,inspection and evaluation analysis of the mechanical properties of domestic poplar LVL is conducted.Through good-of-fitness tests,it is found that the mechanical properties of poplar LVL fit lognormal distribution very well.The study of the characteristic values of the mechanical properties of poplar LVL provides a reference for the methods for determining the characteristic values of China's structural LVL.

The construction technology of nailed joint in timberwork used larch in the northeast of China have been studied. The result showed that when nailed joint used Larix gmelini, pre - drilled diameter was around 85 percent of the nail diameter and pre - drilled depth should exceed the into deep of nails. The nail was not too thick at the end of the nailed joint, test determined or adopt corresponding technical measures had to ensure that the connection performance.

This article describes the principles and technical requirements for wood I-joists used in structural applications.This newly developed Chinese standard explains and illustrates all major technical parameters including material selection,load-carrying properties,test methods,and quality control.

单板层积材（Laminated Veneer Lumber，LVL）作为结构复合木材产品之一，与单板条层积材（Parallel Strand Lumber，PSL）、木条定向层积材（Laminated Strand Lumber，LSL）和定向刨花方材（Oriented Strand Lumber，OSL）等产品已经成为北美重要的木质工程材料，广泛应用于民用和商业木结构建筑。

The manufacturing technology and characteristics of I-joist used for light wood structures are introduced in brief.The requirements for quality and performance of I-joist in North America as well as relevant test items,principles,characteristic value calculation and evaluation methods are introduced.

The formula derivation, test, calculation,verification and analysis of the deflection of wood I-beam are conducted. The results show that considering shearing deformation,the measured deflection value is very close to the predicted deflection value while there is a big difference between measured value and predicted value when ignoring shear deformation. Theory and real measurement show that shear deformation can＇t be ignored when calculating the deflection of wood Z-beam. Such values as EI and K of wood I-beam can be obtained through the test, and those values can be used for the accurate prediction of the deflection of wood I-beam, which provides a comparatively simple method for calculating and predicting the deflection of wood Z-beam.

Larch resources and its characteristics are introduced,the research status of larch used for light wood structure is reviewed and suggestions for researching and developing larch wood-based materials used for light wood-frame construction are made.

Nailed joint is a common manner in timber structure.Wire nail is the major material of the nailed joint in timber structure.The mechanical properties and dimension of the wire nail from different factories in American or in our country were tested.It was found that the dimension and mechanical properties of the wire nail from American or our country is very close.The import wire nail can be replaced by the one that made in our country,and used in modern timber structure buildings.