Steel Fiber Reinforced Concrete Flexural Members Design Parameters

The Steel fiber reinforced concrete is a kind of new structural material and a kind of new composite material that is formed by adding the proper amount of steel fibers into ordinary concrete recently. It can be poured and ejected to form any shapes. It has better physical-mechanical properties than ordinary concrete except compressive strength. It can make ordinary concrete that is a kind of brittle material change into a kind of composite material which has better plasticity. Its main working mechanism is to improve the brittleness of ordinary concrete by using short fibers that are scattered evenly. Because steel fiber has higher tensile strength and ordinary concrete has higher compressive strength during the process of stressing, every technical property of fiber-reinforced concrete is improved greatly. Accordingly, fiber-reinforced concrete has better mechanical properties such as cracking resistance, bending resistance, fatigue resistance, wearing resistance, toughness, etc. So it has brilliant future in architectural construction.Based on steel fiber reinforced concrete basic theory, and the regulation of design code for reinforced concrete structure, technical specification for fiber reinforced concrete structure, this thesis takes in account of stressing characteristics and design method on ordinary reinforced concrete bending element and gives some new opinions on steel fiber reinforced concrete. The thesis includes three contents. The first one is focused on some design control parameters by comparing steel fiber reinforced concrete with ordinary reinforced concrete. The second one is focused on the effects of steel fiber on permissible effective span-to-depth ratio steel fibers reinforced concrete bending element. At last, design control parameters and relative theory on cracking control without calculation are discussed. By contrast, the thesis not only draws a calculated formula on the balance steel ratio and permissible effective span-to-depth ratio of steel fiber reinforced concrete member, but also gives permissible effective span-to-depth ratio under different gradation conditions. And the thesis draws the control parameters on cracking control without calculation, relative calculation formulae and curve charts on steel fiber reinforced concrete.