洛洛智久
土木工程施工 Civil Engineering Construction基础工程 Foundation Engineering混凝土结构课程设计 Design of Concrete Structures基础课程设计 Course Project钢结构课程设计 Steel structure curriculum design电工技术 Electrotechnical结构力学 Structural Mechanics房屋建筑学课程设计 The course of housing design建筑设备 Construction Equipment房屋建筑学 Building Architecture弹性力学 Elasticity土力学 Soil Mechanics建筑工程经济 Economic construction钢结构设计原理 Steel structure design principles混凝土结构设计原理 Concrete structure design principle马克思主义基本原理 The basic principles of Marxism工程数学 Engineering Mathematics水力学 Hydraulics建筑法规 Building Code工程地质概论 Introduction to Engineering Geology体育 sports大学英语 College English认识实习 Cognition Practice土木工程材料 Civil Engineering Materials结构力学 Structural Mechanics大学物理实验B类 Class B physics experiment毛泽东思想、邓小平理论和“三个代表”重要思想概论 Mao Zedong Thought, Deng Xiaoping Theory and "Three Represents" Thought
卫浴小哥
1. 一个材料的应力和应变之间的关系是通过拉伸测试法决定的。材料样品，通常是一根圆棒被放在一个测试设备里然后拉伸。随着负荷的增加，针对棒材的受力与延伸度进行测量。测量应力是以受力除于截面积，而应变是以延伸度除于受延伸的长度。通过这种方式，就能获取该材料的完整应力-应变关系图。2. 图1 显示的是结构钢材的应力-应变关系图的典型形状；轴向应变是沿着水平轴线绘制，而相应的应力是以坐标至曲线0ABCDE体现。从0到A，应力和应变成正比，图形显示是直线。超出A点后， 应力和应变相互之间的直线关系已不复存在， 所以，在A点的应力被称作比例极限。
灰羽联盟
6．(1)Equate to zero the moment about one point and the force sums in two directions. This is the approach of Eqs.(2a,b).对某点的力矩的和，和在俩个方向上力的和等于零(2) )Equate to zero the moment sums about two points and the force sum in a direction that is not perpendicular to the line connecting the two chosen points.对两点的力矩的和，和在一个方向上力的和等于零，这个方向与所选的两点的连接不垂直(3)Equate to zero the moment sums about three points that are not collinear.对不共线的三点的力矩的和等于零7．(1)A particle will remain at rest or move with constant speed along a straight line, unless it is acted upon by a resultant force.一个质点，在没有受到合外力作用时，总保持静止或匀速直线运动状态(2)When a resultant force is exerted on a particle, the acceleration of that particle is parallel to the direction of the force and the magnitude of the acceleration is proportional to the magnitude of the force.当一个质点受到合外力作用时，质点加速度的方向与合外力的方向相平行，而且加速度的大小与力的大小成正比 (3)The force exerted on one particle by another is equal and opposite to the force exerted by the first particle on the second.一个质点对另一个质点的作用力与第二个质点对第一个质点的作用力大小相等，方向相反8.The motion of a rigid body consists of a superposition of two movements.The first part consists of a movement of all points following the motion of an arbitrarily selected point in the body. The second movement is a rotation about the selected point in which all lines rotate by the same amount.一个刚体的运动有两个重叠的运动组成。第一部分包括一个所有点都跟随刚体上任意基点的平动的运动。第二部分的运动是关于几点的转动，在转动中过基点所有的线以相同的角速度转动15.As mentioned previously, the dynamic effect,I.e.,the influence of inertia forces on the process of stress development in a body, depends on the dynamic loading conditions. These are quasi-static states of stress, vibrations, and stress waves. The limits between these groups are not clearly defined, however, and frequently the phenomena associated with more than one group can occur in the same dynamic event .如前所述，动态力的影响，即惯性力是一个物体的应力变化过程的影响，取决于动态负载的情况，可分为三种典型现象。他们分别是（1）准静态应力状态（2）振动和（3）应力波动。这三组的界限，不是清楚地被定义的。然而，经常地联系不止一个组的现象，能发生在同一个动力学的问题中
