一、前言随着公路运输的发展,车辆的载重吨位越来越大。我省过去修建的钢筋混凝土梁式桥,有些由于某种原因在通车后出现比较严重的裂缝和变形。目前公路管理部门对这类桥梁,不得不采取限载、减载的措施。因此,如何改造这类桥梁,提高其承载能力,以适应近期公路运输事业发展的需要,是当前公路养护工作中急待解决的问题。因此研究如何利用原有结构,采用简易补强措施, I. Preface With the development of road transport, the carrying capacity of vehicles is getting bigger and bigger. In the past, the reinforced concrete beam bridge constructed in our province has some serious cracks and deformations after being opened to traffic for some reason. At present, highway administrations have to take such measures as load limiting and load shedding on such bridges. Therefore, how to reform such bridges and increase their carrying capacity to meet the needs of the recent development of road transport is an urgent problem to be solved in the current road maintenance work. Therefore, the study of how to use the original structure, the use of simple reinforcement measures,