ASTM D6555-2017 red 6875 Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies《木制反复使用组件的系统效果评定的标准指南》.pdf
《ASTM D6555-2017 red 6875 Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies《木制反复使用组件的系统效果评定的标准指南》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6555-2017 red 6875 Standard Guide for Evaluating System Effects in Repetitive-Member Wood Assemblies《木制反复使用组件的系统效果评定的标准指南》.pdf(13页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D6555 03 (Reapproved 2014)D6555 17Standard Guide forEvaluating System Effects in Repetitive-Member WoodAssemblies1This standard is issued under the fixed designation D6555; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revisio
2、n, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.INTRODUCTIONThe apparent stiffness and strength of repetitive-member wood assemblies is generally greater thanthe s
3、tiffness and strength of the members in the assembly acting alone. The enhanced performance isa result of load sharing, partial composite action, and residual capacity obtained through the joiningof members with sheathing or cladding, or by connections directly. The contributions of these effectsare
4、 quantified by comparing the response of a particular assembly under an applied load to theresponse of the members of the assembly under the same load.This guide defines the individual effectsresponsible for enhanced repetitive-member performance and provides general information on thevariables that
5、 should be considered in the evaluation of the magnitude of such performance.The influence of load sharing, composite action, and residual capacity on assembly performancevaries with assembly configuration and individual member properties, as well as other variables. Therelationship between such var
6、iables and the effects of load sharing and composite action is discussedin engineering literature. Consensus committees have recognized design stress increases forassemblies based on the contribution of these effects individually or on their combined effect.The development of a standardized approach
7、 to recognize “system effects” in the design ofrepetitive-member assemblies requires standardized analyses of the effects of assembly constructionand performance. Users are cautioned to understand that the performance improvements that might beobserved in system testing are often related to load pat
8、hs or boundary conditions in the assembly thatdiffer from those of individual members. This is especially true for relatively complex assemblies. Forsuch assemblies, users are encouraged to design the test protocols such that internal load paths, as wellas summations of “loads in” versus “loads out”
9、 are measured (see X3.11.7.1). Data from testing,preferably coupled with analytical predictions, provide the most effective means by which systemfactors can be developed. When system factors are intended to apply to strength (rather than beinglimited to stiffness), loads must be applied to produce f
10、ailures so that the effects of nonlinearities orchanges in failure modes can be quantified.1. Scope1.1 This guide identifies variables to consider when evaluating repetitive-member assembly performance for parallel framingsystems.1.2 This guide defines terms commonly used to describe interaction mec
11、hanisms.1.3 This guide discusses general approaches to quantifying an assembly adjustment including limitations of methods andmaterials when evaluating repetitive-member assembly performance.1.4 This guide does not detail the techniques for modeling or testing repetitive-member assembly performance.
12、1.5 The analysis and discussion presented in this guideline are based on the assumption that a means exists for distributingapplied loads among adjacent, parallel supporting members of the system.1.6 Evaluation of creep effects is beyond the scope of this guide.1 This guide is under the jurisdiction
13、 of ASTM Committee D07 on Wood and is the direct responsibility of Subcommittee D07.05 on Wood Assemblies.Current edition approved Aug. 1, 2014Nov. 1, 2017. Published August 2014November 2017. Originally approved in 2000. Last previous edition approved in 20082014as D6555 03 (2008).(2014). DOI: 10.1
14、520/D6555-03R14.10.1520/D6555-17.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recomm
15、ends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States11.7 This guide
16、does not purport to suggest or establish appropriate safety levels for assemblies, but cautions users that designersoften interpret that safety levels for assemblies and full structures should be higher than safety levels for individual structuralmembers.NOTE 1Methods other than traditional safety f
17、actor approaches, such as reliability methods, are increasingly used to estimate the probability of failureof structural elements. However, the extension of these methods to assemblies or to complete structures is still evolving. For example, complete structureswill likely exhibit less variability t
18、han individual structural elements. Additionally, there is a potential for beneficial changes in failure modes (i.e., moreductile failure modes in systems). These considerations are beyond the scope of this guide.1.8 The values stated in inch-pound units are to be regarded as the standard. The SI eq
19、uivalents are approximate in many cases.1.9 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatoryli
20、mitations prior to use.1.10 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development of International Standards, Guides and Recommendations issuedby the World Trade Organization
21、Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2D245 Practice for Establishing Structural Grades and Related Allowable Properties for Visually Graded LumberD1990 Practice for EstablishingAllowable Properties for Visually-Graded Dimension Lumber from In-Grade Te
22、sts of Full-SizeSpecimensD2915 Practice for Sampling and Data-Analysis for Structural Wood and Wood-Based ProductsD5055 Specification for Establishing and Monitoring Structural Capacities of Prefabricated Wood I-Joists2.2 Other Documents:ANSI/ASAE EP559.1-2010 Design Requirements and Bending Propert
23、ies for Mechanically-Laminated Wood Assemblies3ASCE/SEI 7-10 Minimum Design Loads for Buildings and Other Structures4ANSI/AWC SPDWS-2015 Special Design Provisions for Winds and Seismic5ANSI/AWC NDS-2015 National Design Specification (NDS) for Wood Construction5ANSI/TPI 1-2014 National Design Standar
24、d for Metal Plate Connected Wood Truss Construction63. Terminology3.1 Definitions:3.1.1 composite action, ninteraction of two or more connected wood members that increases the effective section propertiesover that determined for the individual members.3.1.2 element, na discrete physical piece of a m
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
本资源只提供5页预览,全部文档请下载后查看!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD65552017RED6875STANDARDGUIDEFOREVALUATINGSYSTEMEFFECTSINREPETITIVEMEMBERWOODASSEMBLIES 木制 反复 使用

链接地址:http://www.mydoc123.com/p-522845.html