Bases for ASD and LRFD
ASD is based on elastic theory. Design limits the maximum unit stress a member is permitted to bear under service loads […]
Sociological changes, new technology in industry and commerce, new building codes, other new laws and regulations, inflationary economies of nations, and advances in building technology place an ever-increasing burden on building designers
and constructors. They need more and more knowledge and skill to cope with the demands placed on them.
The public continually demands more complex buildings than in the past. They must serve more purposes, last longer, and require less maintenance and repair. As in the past, they must look attractive. Yet, both building construction and operating
costs must be kept within acceptable limits or new construction will cease.
To meet this challenge successfully, continual improvements in building design and construction must be made. Building designers and constructors should be alert to these advances and learn how to apply them skillfully.
One advance of note to building design is the adaptation of operations research, or systems design, developed around the middle of the twentieth century and originally
applied with noteworthy results to design of machines and electronic equipment.
In the past, design of a new building was mainly an imitation of the design of an existing building. Innovations were often developed fortuitously and by intuition and were rare occurrences. In contrast, systems design encourages innovation.
It is a precise procedure that guides creativity toward the best decisions. As a result, it can play a significant role in meeting the challenges posed by increasing building complexity and costs. The basic principles of systems design are presented
in this section.
ASD is based on elastic theory. Design limits the maximum unit stress a member is permitted to bear under service loads […]
In the past fifteen years the variety of sprinklers available has grown tremendously. Years ago an engineer would simply specify
Dampproofing is generally only a mopped-on coating, whereas waterproofing usually is a built-up coating of one or more plies. Bituminous systems
Well-equipped concrete producers have continuous measuring devices to record changes in moisture carried in the aggregates or changes in total free
With good quality control, no water is permitted on the mixing truck. If the slump is too low (or too high)
These tiles are intended for use on rigid subfloors, such as smooth-finished or screeded concrete, structurally sound plywood, or hardboard floors
There are three standard types: Type I, uniform or nonuniform thickness; Type II, thick butt; and Type III, uniform or nonuniform
Asphalt mastics used for waterproofing floors and similar structures, but not intended for pavement, consist of mixtures of asphalt cement, mineral
The NRCA Roofing and Waterproofing Manual, National Roofing Contractors Association, Rosemont, IL 60018-5607. JOINT SEALS Calking compounds, sealants, and gaskets are