Civil Engineering Study 88-6
INTRODUCTION 1.1 General Remarks The "Allowable Stress Design" method has long been used for the design of steel structures in the United States. 1,2,3 Recently, the probability-based load and resistance factor design (LRFD) criteria have been successfully applied to the structural design of hot-rolled steel shapes and built-up members. 4,5,6 The AISI LRFD Specification is being developed as well for the design of structural members cold-formed from carbon and low alloy steels. 7-17 These design criteria can provide a more uniform degree of structural safety to achieve consistent reliability for different design situations. The probability-based design method is developed on the basis of the "Limit States Design" philosophy, 18-22 which is related to the ultimate strength and serviceability of the structural members and connections. In the United States, research work on probability-based design has focused primarily on the ultimate strength limit states because such limit states are clearly defined. In order to update the 1974 edition of the AISI Specification and to develop the new LRFD Specification for cold-formed stainless steel structural members. a research project entitled "Load and Resistance Factor Design of Cold-Formed Stainless Steel" was initiated in July 1986 at the University of Missouri-Rolla under the sponsorship of the American Society of Civil Engineers (ASCE). This study was conducted by Shin-Hua Lin under the direction of Dr. Wei-Wen Yu. Dr. Theodore V. Galambos of the University of Minnesota is the ASCE consultant for the project. The first phase of this study dealt with the revision of the 1974 edition of the AISI allowable stress design specification 3 for cold-formed stainless steel structural members and its commentary. Based on the reevaluation of previous test results obtained from the research projects conducted at Cornell University 23-27 and the current AISI specifications for the design of cold-formed stainless steel and carbon steel structural members, 2,3 a draft of the Proposed Allowable Stress Design Specification with Commentary has been prepared and published in the Third Progress Report. 30 This proposed ASCE Specification includes four types of austenitic stainless steels (annealed, 1/16-, 1/4-, and 1/2-Hard Types 201, 301, 304, and 316) and three types of ferritic stainless steels (annealed Types 409, 430, and 439). Following a careful review by the ASCE Steering Committee at its meeting held at the University of Missouri-Rolla on April 21, 1988, it was recommended that the proposed ASD Specification included in the Third Progress Report be submitted to the new ASCE Standard Committee for consideration. The second phase of this project is to develop the new LRFD criteria for cold-formed stainless steel structural members. These criteria are to be developed on the basis of the first-order probabilistic theory by using only the mean values and coefficients of variation of load effects, material factors, fabrication factors, and profess ional factors. The development of load and resistance factor design criteria for cold-formed stainless steel structural members is being carried out at the University of Missouri-Rolla. The initial work included statistical analyses of mechanical properties and material thicknesses together with the calibrations of the proposed LRFD provisions by using the available test data.
Civil, Architectural and Environmental Engineering
American Society of Civil Engineers
Wei-Wen Yu Center for Cold-Formed Steel Structures
Missouri University of Science and Technology
01 Oct 1988
© 1988 Missouri University of Science and Technology, All rights reserved.
Lin, Shin-Hua; Yu, Wei-wen; and Galambos, Theodore V., "Load and resistance factor design of cold-formed stainless steel statistical analysis of material properties and development of the LRFD provisions" (1988). CCFSS Library (1939 - present). 72.