部分预应力混凝土受弯构件抗裂度、刚度和最大裂缝宽度的计算

• 作 者: 丁大钧
• 出 处: 冶金建筑
• 发表日期: 1981年11期
• 关键词: 部分预应力 抗裂度 预压应力 混凝土受弯构件 裂缝宽度 受拉区 预应力钢筋 预应力梁 混凝土徐变 全预应力

一、概述早先,英、美一些国家制作预应力混凝土构件时总是将预应力加至这样的程度,即在使用荷载下受拉边缘纤维不容许出现拉应力,甚至保留不低于10公斤/厘米~2的预压应力,这即所谓全预应力。由于构件受拉区承受很大的预压应力,因此对边边缘(预拉区)亦将可能产生很大的预拉应力而引起裂缝。预拉区的裂缝将使在使用荷载下的刚度和抗

I. General description Earlier, in the production of prestressed concrete structures in some countries in the United Kingdom and the United States, prestressed concrete elements were always added to such a degree that the tensioned fibers at the edges did not allow tensile stress and even retained at least 10 kg per load. The pre-compression stress of centimeter~2 is called full prestress. As the tension zone of the component is subjected to a large pre-stress, the edge (pretension zone) will also have a large pre-tension stress and cause cracks. Cracks in the pre-tension zone will make the stiffness and resistance under the use of load