一、概述混凝土因其取材广泛、价格低廉、抗压强度高、可浇筑成各种形状,并且耐火性好、不易风化、养护费用低,成为当今世界建筑结构中使用最广泛的建筑材料。混凝土最主要的缺点是抗拉能力差,容易开裂。大量的工程实践和理论分析表明,几乎所有的混凝土构件均是带裂缝工作的,只是有些裂缝很细,甚至肉眼看不见(<0.05mm),一般对结构的使用无大的危害,可允许其存在;有些裂 I. Overview Concrete because of its wide range of materials, low prices, high compressive strength, can be poured into a variety of shapes, and good fire resistance, easy weathering, low maintenance costs, become the world’s building structures used in the most widely used building materials. The main disadvantage of concrete is poor tensile strength, easy to crack. A large number of engineering practice and theoretical analysis show that almost all concrete members work with cracks, except that some of the cracks are very thin and even invisible to the naked eye (<0.05mm), and are generally not harmful to the use of the structure and allow Exist; some crack