【作者】 董梁；

【导师】 田稳苓；

【作者基本信息】 河北工业大学 ， 结构工程， 2006， 硕士

【摘要】 随着经济的发展,建筑工程的重点将从大规模新建阶段逐步向旧建筑维修加固阶段转移,统计资料显示,改建比新建工程可节约投资约40%,工期缩短约50%,收回投资速度比新建快3～4倍,同时大量的自然灾害使许多建筑物受到不同程度的损伤,影响了建筑物的正常使用,而由于时代发展带来的建筑物使用功能的改变以及建筑物自身不可抗拒的老化问题使得加固改造的问题日渐严峻。如何采取有效的加固措施对受损建筑物进行处理以恢复其使用功能是工程技术人员面临的重要课题,也是本文研究的初衷。 钢绞线防腐砂浆加固混凝土构件是一种新型的加固方法。相对于其他的加固方法,防腐砂浆为无机材料,耐久性和耐火性好,并且试验中采用了镀锌钢绞线,它强度高,耐锈蚀性能也较好,加固施工简便,加固后对建筑外观影响很小,所以此加固技术具有比较广阔的应用前景。 本文从工程实际应用的角度,对采用钢绞线防腐砂浆加固后的钢筋混凝土梁进行了试验研究。共试验了8根梁,其中2根为未加固的对比试验梁,6根为用钢绞线防腐砂浆加固的试验梁。试验结果表明,加固梁的承载力和刚度提高明显。 最后在试验的基础上,研究了加固梁的抗弯受力性能和破坏形态及破坏机理,给出了加固梁的刚度计算公式和可用于实际工程设计的承载力计算公式,同时提出了可靠的钢绞线锚固方法以及加固施工方法。更多还原

【Abstract】 With the development of economy, the focus of buildings will gradually shift from largely constructing new buildings to repairing and reforming of existing buildings. According to statistics, reforming can saves investment by 40% and cuts construction time by 50% and recoups capital outlay two or three times faster than building new ones. Moreover, many new buildings are damaged to different extents by numerous natural disasters, and cannot be put into normal use. Besides, social development has left many buildings outdated and unfit in function and use. Lastly, the aging of buildings is an irresistible problem. All these have made strengthening and reforming of buildings increasingly important and urgent. How to take effective strengthening measures to recover the functions of damaged buildings is an urgent project for all structural engineers, which is also original intention for the present research.The method that steel reinforced concrete member is strengthened with steel strand and anticorrosive mortar is a new strengthening method. Compared with other strengthening methods, since the anticorrosive mortar is a kind of inorganic material with durability and fire-resisting property, and the galvanized steel strand with high strength used in this experiment is hard to be rusted, the method is easy to construct, and after strengthening a building its figure is hardly altered, so these characteristic endow them with a prosperous prospect.Based on the actual application in a project, this thesis aims at the experimental investigation on the performance of steel reinforced concrete beam strengthened with steel strand and anticorrosive mortar, In the experiment eight beams are investigated, two of which were reference beams that is not strengthened, six of which are beams strengthened with steel strand and anticorrosive mortar.The experimental results indicate that the flexural capacity and stiffness of the strengthened beam are evidently improved.Based on the experiment, the flexural performance, failure mode and mechanism are evaluated. The formulas for calculating the flexural capacity and stiffness are suggested, and the former can be used to design member that are needed to be strengthened in the actual application. Moreover, reliable anchoring method on steel strand and construction method for strengthening are presented.更多还原