寿县合兴浅谈预应力钢结构有哪些优点？发布时间：2015-9-8 9:40:45 浏览次数:503
There are four main advantages of prestressed steel structure. One can be fully and repeatedly using the range value of the elastic strength of steel so as to improve the structure bearing capacity. The bearing capacity of the steel structure from traditional materials of zero stress state, loading and gradually achieve material design strength and termination of force, the sum of its bearing capacity is the structure under various load. And the bearing capacity of prestressed steel structure begins with prestressed produce negative stress state. Prestressed steel structure under load, material after the negative stress - zero stress and normal stress - stress design strength, reach the final value of the structure of the bearing capacity. So, the structure bearing capacity increase partly by material from the negative stress to zero stress the contribution of this stage. Many prestressed steel structure with a lot from the negative stress to zero stress loading process, therefore, it can contribute to many times, so has a greater carrying capacity.
Second, can improve the structure stress, reduce stress peak value. For example, the peak bending moment of flexural member, can increase the brace prestress, converts part of the bending moment to axial force. To reduce peak as a result, the bending moment, and reduce the size of cross section, and even using prestressed technology to create the zero moment of lateral structure system, such as cable domes.
Third, can improve the structure stiffness and stability, improve various properties of the structure. Prestressed structure deformation and reverse deformation under load, stiffness is improved consequently. Change due to bousso structure boundary condition, can increase the structure stability. Prestressed can adjust the structure of cyclic stress characteristics and improve the fatigue strength. Reduce weight and reduce the seismic load, thus improve the seismic performance, etc.
Fourth, can reduce the amount of steel, save the cost. Characteristic of steel strength, improve the structure boundary conditions, optimizing the structure of bar and section size, the sum of innovation advantage such as bearing structure system, must reflect on the lower amount of steel. In guarantee under the premise of structure bearing and use function, saving the material consumption, to reduce the cost, is to design personnel in a job reflect "low-carbon economy", "green building" concept of the event.