摘要:

An integrated microcomputer‐based knowledge system is developed for risk management in construction. The system (Expert‐Risk) applies the concepts of fuzzy set theory to evaluate the overall risk of a project. It is also integrated with various rerlational data bases that provide the system with financial and cost data necessary for bankruptcy and risk analysis. Today's construction industry involves more dynamic and construction industry involves more dynamic and uncertain planning than ever before. without professional risk management, decision makers cannot systematically approach complex problemx. The system provides a more definitive perception of the overall risk of a construction project, and a more rational basis for contingency planning and evaluation. The system allows management to focus on those risk factors which have significant impact on plann

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00233.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

Conventional techniques for computer processing of contour maps usually require large storage capacities. Storage requirements can be significantly reduced by storing each contour line as a sequence of cubic Bezier curves. The Bezier curves can be constructed such that a continuous smooth approximation to the original contour line is obtained. This article describes a microcomputer implementation of techniques for the storage, retrieval, and editing of contour maps based on their approximation by Bezier curves.

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00234.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

An interactive graphics microcomputer program for the analysis and design of 2‐D framed structures is described in this paper. The system is designed to utilize the full power of microcomputer graphics technology and recent advances in computer science. The interaction between the user and the machine is provided by the mouse as an input device which allows engineers to create and load a structure visually as well as to select options rapidly from the mouse oriented menu system. The paper shows the capabilities of this new system and describes the methodology used in its developmen

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00235.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

A more accurate approximating method for the analysis of building frames than the original distribution factor method described in Reference [7] is presented. The relative magnitudes of the joint displacements (w, α, β) on a particular floor are rather insensitive to the lateral load and are dependent largely on the local stiffness of the beams and columns of the floor of interest. These relative magnitudes are called distribution factors. The distribution factors corresponding to unit u, v, and θ displacements, respectively, can be determined floor by floor. The absolute magnitudes are then obtained by linear combination of the distribution factors. The coefficients of the linear combination are called the mixing factors. There are nine mixing factors per floor, three for each displacement (w, α, β) corresponding to unit u, v, and θ, respectively. The mixing factors are found after the lateral loads are imposed. This paper makes corrections on the displacements for very tall buildings where uneven elongations of columns along the height are important. A new distribution pattern in terms of cubic polynomials with an additional ten unknowns per floor is added to the original sets of distribution factors. The total number of unknowns per floor for a three‐dimensional building is 22 (9 mixing factors + 10 coefficients of the cubic polynomial + 3 horizontal displacements u, v, θ) irrespective of the complexity. Less than 5% errors in the computed nodal displacements are achieved. The method is particularly suitable for microc

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00236.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

In two previous papers, second‐order elastic analysis of multistory building frames by marching technique [1] and elastic‐plastic analysis of rectangular frames [2]have been dealt with. The algorithms described in those two papers are now combined into an efficient computer program for conducting the elastic‐plastic analysis of multistory building frames by marching technique. With this program, the response of a multistory building frame, subjected to uniform loads on the beams and lateral loads at the floor levels, may be traced from the service load condition to proportionate overloads until collapse through sequence of formation of plastic hinges. Because&am spans are not divided into elements in the analysis, plastic hinges are assumed to remain at the same locations once they are installed on them. Consequently, moments in beams may later exceed slightly the plastic moment capacity. It is believed that the algorithm is useful to form a basis for further investigations, such as considerations for more than the two essential second‐order effects, or for effects of semirigid beam‐to‐column connections and of axial force on the plastic mome

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00237.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

摘要:

This article presents a review of new generation microcomputers using the Intel 32‐bit 80386 processor. They include ISM PSI2 Model 80, Compaq Deskpro 386, Kaypro 386, ALR Access 386, and Tandy 4000. Some of the powerful 16‐bit 80286‐based machines introduced into the market recently are also reviewed. They include the IBM PS/2 Models 50 and 60 and Compaq Portabl

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00238.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00239.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY

ISSN:1093-9687    

DOI:10.1111/j.1467-8667.1987.tb00232.x

出版商:Blackwell Publishing Ltd    

年代:1987

数据来源: WILEY