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钢结构发展方向之一是采取预加应力,使之建立符合设计需要的应力状态,以提高其强度、刚度和节约钢材、降低造价。苏联学者提出的“局部杆件弹性变形法”是对结构构件截面中局部杆件施加作用力,使它产生弹性变形,随即连成整体,以保持所建立的应力状态。现以简单的工字形梁为例,介绍各种预加应力的施工方法,并作简要对比分析。取受均布荷载为5～70kN/m作用的,
One of the development orientations of steel structures is to adopt pre-stressing to establish a stress state that meets the design needs, so as to increase its strength, stiffness, and save steel and reduce the cost. The “local bar elastic deformation method” put forward by Soviet scholars is to exert a force on the local bar in the structural member cross-section so that it will produce elastic deformation, and then it will be integrated to maintain the established stress state. A simple I-beam is taken as an example to introduce various pre-stressed construction methods and a brief comparison analysis. Take a uniform load of 5 ~ 70kN / m role,