静定平面钢架受力分析.doc

静定平面钢架受力分析 XXX 摘要：刚架的特点:杆件少，内部空间大，便于利用。刚结点处各杆不能发生相对转动，因而各杆件的夹角始终保持不变。刚结点处可以承受和传递弯矩，因而在刚架中弯矩是主要内力。刚架中的各杆通常情况下为直杆，制作加工较方便。?根据结构组成特点，静定平面刚架可分为：悬臂刚架：常用于火车站站台雨棚等。简支刚架：常用于起重机的刚支架及渡槽横向计算所取的简图等三铰刚架：常用于小型厂房、仓库、食堂等结构。刚架结构在土木工程中应用较广。但静定的刚架在工程中应用不多，多为超静定刚架，如房屋建筑结构中的框架结构。解算超静定刚架的内力是建立在静定刚架内力计算基础之上的。所以，必须熟练掌握静定刚架的内力计算方法。 关键词：平面刚架； 超静定刚架；内力 Statically determinate planar steel stress analysis Shaoxiangyang Abstract：The characteristics of the frame: bar, less internal space is big, easy to use. Just the rod cannot occur relatively rotation at junctions, and Angle of the bar is always remains the same. Just at junctions can absorb and transmit bending moment and bending moment are the main internal force in rigid frame. Frame of the rod as the straight rod, normally make processing more convenient. According to the structure characteristics of statically determinate planar frame can be divided into: cantilever frame: often used in the railway platform canopy, etc. Simply supported frame: commonly used in cranes just stents and diagram of aqueduct transverse calculations take three hinged frame: often used in small workshop, warehouse, canteen and structure. Frame structure is widely used in civil engineering. But statically determinate frame in engineering application is not much, more than for statically indeterminate frame, such as building the structure of the frame structure. Solving statically indeterminate frame internal force is based on the determinate frame internal force calculation. So, must be skilled in statically determinate frame internal force calculation method Key words: plane rigid frame; Statically indeterminate frame; The internal force 引 言 刚架是由若干根直杆（梁和柱）用刚结点（部分可为铰结点）所组成的结构。刚结点能承担力与力矩，所以不管杆件中部是否作用有横向荷载，都将产生弯曲变形，各横截面各有弯矩、剪力和轴力三种内力。当组成刚架的各杆的轴线和外力都在同一平面时，称作平面刚架。刚架结构在土木工程中应用较广。但静定的刚架在工程中应用不多，多为超静定刚架，如房屋建筑结构中的框架结构。解算超静定刚架的内力是建立在静定刚架内力计算基础之上的，所以，必须熟练掌握静定刚架的内力计算方法。 1 常见静定平面钢架的类型 为了进一步了解研究静定平面钢架的组成和受力及其特点，先与铰结点对比。从变形角度看，在刚结点处各杆不能发生相对转动，因而各杆间的夹角在变形前后始终保持不变。从受力角度看，刚结点可以