偏载下板柱结构中柱节点受力性能试验研究
发布时间：2019-01-18 15:59
【摘要】：钢筋混凝土板柱结构起源于20世纪初美国和欧洲等地区,并凭借其结构形式简洁、能降低建筑物层高、方便施工和良好的经济效益等特点广泛于住宅、办公楼及车库等建筑当中。在实际工程当中,板柱结构通常配合剪力墙使用以增加结构的侧向刚度和强度。但由于水平荷载作用及板柱结构本身可能出现不等跨等因素的影响,板柱节点通常需要同时传递竖向荷载和不平衡弯矩而发生脆性的冲切破坏。正因如此,板柱节点的冲切破坏问题一直吸引着研究人员。本文采用重剪比以及配筋率两个试验变量对7个偏载下板柱中节点的破坏过程进行了对比试验,获取了板的荷载-挠度曲线及挠曲形状、混凝土及钢筋应变、板底裂缝分布,以及开裂荷载、极限荷载等试验数据,并在试验过程中采用特制应变测杆对试件内部斜裂缝的形成和发展予以监测。试验结果表明:试件最终破坏形态受重剪比和配筋率两因素共同影响;重剪比相同的试件,配筋率的提高可有效提高中柱节点对不平衡弯矩的承载力;板内斜裂缝在节点发生冲切破坏之前已产生,由板体中部或中上部向近柱板域剪压区和板底受拉区发展。基于本文试验结果和历史试验数据,对比了舒兆发、Ying Tian、Kyoung-Kyu Choi及各国规范GB50010-2010、ACI318-11、Eurocode2-04所采用的方柱中节点冲切承载力计算公式的精准程度。指出基于偏心剪应力模型的中、美规范对临界剪应力计算的保守,以及对于节点失效的判定准则不甚合理两方面的原因造成了高重剪比数据群的离散。提出我国规范在计算不平衡弯矩分配系数0?时宜考虑重剪比的影响的建议,并据此对原公式进行修正,修正后的规范公式计算精度有所提高。
[Abstract]:The reinforced concrete slab-column structure originated in America and Europe at the beginning of 20th century. With its simple structure form, it can reduce the height of buildings, facilitate construction and have good economic benefits and so on. Buildings such as office buildings and garages. In practical engineering, slabs and columns are usually used in conjunction with shear walls to increase the lateral stiffness and strength of the structure. However, due to the influence of horizontal load and the unequal span of slab-column structure, the flat-column joints usually need to transfer vertical load and unbalance moment at the same time, resulting in brittle punching failure. For this reason, the punching failure problem of slab-column joints has attracted researchers all the time. In this paper, the failure process of joints in slabs and columns under seven eccentric loads is tested by using the test variables of reshear ratio and reinforcement ratio. The load-deflection curves and deflection shapes, the strain of concrete and reinforcement, the distribution of cracks at the bottom of slabs are obtained. The crack load, limit load and other test data are also used to monitor the formation and development of the internal oblique crack in the specimen by using the specially made strain bar during the test. The test results show that the ultimate failure pattern of the specimens is affected by both the reshear ratio and the reinforcement ratio, and the increase of the reinforcement ratio of the specimens with the same reshear ratio can effectively improve the bearing capacity of the mid-column joints to the unbalanced bending moment. The oblique cracks in the plate are developed from the middle or upper part of the plate to the shear zone of the near column and the tensile zone of the bottom of the plate before the joint is damaged by punching. Based on the experimental results of this paper and the historical test data, the accuracy of the formulas for calculating the punching capacity of the joints in a square column used by Shu Zhaofa, Ying Tian,Kyoung-Kyu Choi and the national standard GB50010-2010,ACI318-11,Eurocode2-04 is compared. It is pointed out that in eccentricity shear stress model, the conservative method of American code for critical shear stress calculation and the unreasonable criterion for determining joint failure result in the discretization of data groups with high reshear ratio. It is proposed that the code of our country calculate the unbalance moment distribution coefficient 0? The suggestion of considering the influence of reshear ratio should be taken into account, and the original formula is modified accordingly, and the calculation precision of the modified standard formula is improved.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375
本文编号：2410873
[Abstract]:The reinforced concrete slab-column structure originated in America and Europe at the beginning of 20th century. With its simple structure form, it can reduce the height of buildings, facilitate construction and have good economic benefits and so on. Buildings such as office buildings and garages. In practical engineering, slabs and columns are usually used in conjunction with shear walls to increase the lateral stiffness and strength of the structure. However, due to the influence of horizontal load and the unequal span of slab-column structure, the flat-column joints usually need to transfer vertical load and unbalance moment at the same time, resulting in brittle punching failure. For this reason, the punching failure problem of slab-column joints has attracted researchers all the time. In this paper, the failure process of joints in slabs and columns under seven eccentric loads is tested by using the test variables of reshear ratio and reinforcement ratio. The load-deflection curves and deflection shapes, the strain of concrete and reinforcement, the distribution of cracks at the bottom of slabs are obtained. The crack load, limit load and other test data are also used to monitor the formation and development of the internal oblique crack in the specimen by using the specially made strain bar during the test. The test results show that the ultimate failure pattern of the specimens is affected by both the reshear ratio and the reinforcement ratio, and the increase of the reinforcement ratio of the specimens with the same reshear ratio can effectively improve the bearing capacity of the mid-column joints to the unbalanced bending moment. The oblique cracks in the plate are developed from the middle or upper part of the plate to the shear zone of the near column and the tensile zone of the bottom of the plate before the joint is damaged by punching. Based on the experimental results of this paper and the historical test data, the accuracy of the formulas for calculating the punching capacity of the joints in a square column used by Shu Zhaofa, Ying Tian,Kyoung-Kyu Choi and the national standard GB50010-2010,ACI318-11,Eurocode2-04 is compared. It is pointed out that in eccentricity shear stress model, the conservative method of American code for critical shear stress calculation and the unreasonable criterion for determining joint failure result in the discretization of data groups with high reshear ratio. It is proposed that the code of our country calculate the unbalance moment distribution coefficient 0? The suggestion of considering the influence of reshear ratio should be taken into account, and the original formula is modified accordingly, and the calculation precision of the modified standard formula is improved.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375
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