约束混凝土柱加固技术研究

【作者】 钟聪明；

【导师】 王亚勇； 张自平；

【作者基本信息】 中国建筑科学研究院 ， 结构工程， 2004， 硕士

【摘要】 高强钢绞线—渗透性聚合物砂浆加固混凝土结构技术是目前较新的一项加固技术。它结合了钢绞线网强度高、聚合物砂浆与混凝土材料粘结性能好的特点，并且运输及施工方便、耐久、耐高温。此项技术必将在工程中得到广泛应用。 本文通过试验研究了高强钢绞线网—渗透性聚合物砂浆加固柱方法及其性能，共进行了三组试件(其中一根为高强钢绞线网—聚合物砂浆加固的柱，另一根为未加固柱)的对比试验，每组试件在相同轴压力的作用下，通过水平往复加载记录其柱顶的荷载—位移关系曲线，并通过应变片记录柱身各部位的应变分布情况。 试验结果表明：用高强钢绞线—渗透性聚合物砂浆加固混凝土柱有效地约束了原有混凝土，因而可以不同程度的改善构件的延性，增加了原构件在地震作用下的耗能能力。从另一方面来说，也就是降低了框架柱设计时的轴压比限值。同时，加固后柱的承载能力也有一定程度的提高。因此，这种技术能够广泛应用于加固工程中，取得良好的效果。 通过试验数据的分析，并结合规范的分析方法，初步提出高强钢绞线网—聚合物砂浆加固柱的正截面承载力计算公式。同时，还对加固中节点的设计及施工方法提出了一些简单的建议。更多还原

【Abstract】 At present, an advanced retrofit measure using stainless steel wire mesh and penetrative polymer mortar has emerged as an alternative to traditional strengthening method. Because of steel wire’s high strength, mortar’s excellent adhesion performance and simply procedure of construction, it will be widely used in strengthening field.Methods and performances of column retrofit using stainless steel wire mesh and penetrative polymer mortar are studied in this paper through pseudo-static companion test. Three-group column specimens are designed .In each group, one specimen in the group is retrofitted and the other is not. During each test, make the axial load constant and apply the lateral cyclic load to the top of the column through the horizontal actuator. After the test, the hysteresis curves (lateral force versus column total displacement) and the distribution of strain are recorded.The test results show that this retrofit technique confines the reinforced concrete section effectively. So the strength, the ductility and energy dissipation capacity is increased differently. At the same time, the limit value of the ratio of axial compression stress to strength is reduced. The retrofitted columns have the better aseismic performance than the unretrofitted and satisfy the practice projects. It will have the excellent effect in the strengthening field.In this paper, the formulas calculating the bending capacity of cross section of the retrofitted columns are attained through the test data analysis. Synchronously, some design advices about the beam-column joint and construction are put forward.更多还原