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Economy Analysis of Roof Beam on the Basis of the Intensity Grade of Concrete

Author: MaWanMing
Tutor: RenHong
School: Chongqing University
Course: Civil Engineering
Keywords: Girder Concrete Economic Analysis
CLC: TU375.1
Type: Master's thesis
Year: 2008
Downloads: 80
Quote: 2
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Abstract


About reinforced concrete beams economic research articles lot, most of the literature assumes that the price per unit volume of concrete is Ck, reinforcement unit volume price Cg, and the resulting formula. Rectangular Beams from capacity calculation formula, the concrete strength fc is also an important factor affecting the cost beams. And the construction cost is dynamic characteristics of reinforced concrete beams and reinforced concrete main material valuation must meet the actual situation, therefore, should the angle of the beam from a dynamic economy analysis. Steel and concrete-denominated fixed pricing can be based on the current information on prices and direct their material pricing in two ways. Concrete can be divided according to fixed pricing site mixed concrete spreads and price adjustment in accordance with sand, stone, cement adjusted spreads two kinds of pricing. In this paper, budget software for steel and concrete, respectively, were calculated price, and valuation analysis of the results reinforced that the steel rebar price by Ф18-25 (Ⅲ level) for the most Province. Reinforced concrete beam cost expression can be simplified to longitudinal reinforcement cost and the cost of in-situ concrete. Beams of rectangular cross-section flexural capacity calculation formula indicates that the beam longitudinal reinforcement cross-sectional area can be expressed concrete compressive strength fc. Can be analyzed using SPSS software appears poured concrete with concrete compressive strength price relationship. Thus, the expression for the beam cost only concrete compressive strength an unknown quantity. Cost expressions fc beam of second order partial derivative is greater than 0, indicating that the cost of the beam pattern is concave. This is the optimal design for the beam provides a theoretical basis for optimization methods and steps are: first, the cost shall be calculated in accordance with existing various strength grade of concrete and steel price. The second step, according to the \PKPM software for structural design using to calculate the longitudinal reinforcement of the cross-sectional area. The third step, the concrete strength increases a level, and then calculate the longitudinal reinforcement of the cross-sectional area. If you increase the level of concrete beams can reduce cost, repeat the third step will continue to optimize. Otherwise, the last step of the concrete strength grade is optimum. With the improvement of concrete strength, axial tensile strength of concrete increases Beams exposure will increase the total shear. If you improve concrete strength without increasing the cost of the beam in the case, can increase the shear capacity of the beam, then take advantage of the material's performance, structural economic goal.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures > Girder
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