1、 Building materials Building materials must have certain structural use.it physical properties. First, they must be able to bear load or weight without permanent deformation. When the load on the structural components, components will deformation, it means rope will be stretching or beam will bend.
2、However, when the load is removed, ropes and beams will return to its original position. This kind of material properties is called elasticity. If material is not elastic, then on removing load deformation exist, repeat the loading and unloading eventually increase deformation to structural lose act
3、ion. All used in building structure in the materials such as stone, brick, wood, aluminum, reinforced concrete and plastic within a certain range of load performance of flexibility. If loading beyond the scope, two things will happen: brittle and plastic. If it is the former, the material will sudde
4、nly destruction； If the latter, in certain load (yield strength) material has begun to yield flow, resulting in destruction. For example, steel, stone material is brittle present plastic. Materials by the damage occurred when the ultimate strength of stress decision. Construction materials and an im
5、portant characteristic is its stiffness. This feature by elastic modulus decision. Stress (per unit of area, the force) and the strain (per unit length ratio of the deformation) is elastic modulus. Elastic modulus is characterize material under load shape-shifting abilities. For two have the same ar
6、ea and load of the same material. Elastic modulus big materials little deformation. Structure with steel of elastic modulus is pounds per square inch or kg per square centimeter, aluminum, concrete 3 times of ten times, wood 15 times. Masonry. Masonry from natural materials such as stone and artific
7、ial materials such as brick, concrete blocks composed. Masonry in ancient times is used. Bricks used in city of Babylon not religious buildings, stone material used in large temples of the Nile valley. The pyramids of Egypt, high 481 feet (147m), is the most spectacular masonry structure. Masonry un
8、it initial without using any binding materials piled up, and modern masonry structure as binder materials. Water mud Modern structure material including stone, red-roast clay brick or tiles, the concrete blocks. Masonry is essentially a pressurized material, it cant sustain tension, ultimate strengt
9、h concrete-block masonry depends on and mud. Last strength in 1000 to 4,000 pounds per inch (70 to 280 kg per square centimeter) range change, depends on the block and mud bonding situation. Wood. Wood is a kind of the earliest building materials and is a kind of rare tensile performance good natura
10、l material. The world find hundreds of wood, and each have different physical properties. Only some use in architectural structures as framework components. In the United States, for example, in over 600 kinds of lumber, only 20 used in structure. These are generally conifers or cork, both because r
11、ich and wood easy molding. In the United States, more common in the structure of lumber sort is the loose, spruce and annatto. These timber tensile strength in 50 to 80 pounds per square inch (350 to 5.6 kg per square meter) range. Hardwood initially used as fine wood furniture and interior decorati
12、on such as floor. Due to the wood texture characteristics, it along the intensity of transverse texture texture is greater than the intensity. Wood tensile strength, trans-monounsaturated grain compressive strength is particularly big, and it has a lot of flexural strength. These characteristics mak
13、e it very suitable for structure of the column and beam. Wood, as truss tensile component is invalid, because the truss structures tensile strength depends on component between node, although has produced many USES lumber tensile strength of metal fittings, but it is difficult to design the arrange
14、grain direction of shear strength or tensile strength little relation of components. Steel. Steel is an important structural materials. When compared to the other materials by such as weight, it has high intensity, even if it volumetric weight is lumber ten times. Its elastic modulus is very big, th
15、e results under load deformation is small. It can be rolled into many structural forms such as work fonts beam, plate. It can also cast complex style, it also can produce into ropes type used in cable suspension bridge and condole top, production into elevator rope and prestressed concrete in the rods. Steel components are many ways of link together like bolt connection, riveting and welding. Carbon steels are vulnerable to oxidation corrosion
