约束混凝土柱组合梁框架节点及框架施工技术

发布时间：2019-02-26 07:56

【摘要】：作为一种新型框架,约束混凝土柱组合梁框架具有自重轻抗震性能好的特点。现有规范、规程对这种框架的设计、施工均无相关规定。本文对现浇约束混凝土柱组合梁框架节点抗震性能、节点施工技术、高强连续复合螺旋箍施工技术、装配整体式约束混凝土柱组合梁框架预制构件连接节点及装配整体式框架施工技术,进行了系统的研究。主要研究内容和结论如下：(1)通过拟静力试验,研究了在端板十节点钢板箍约束下翼缘削弱节点的抗震性能。结果表明,端板+节点钢板箍的约束将节点脆性剪切破坏变为延性剪切破坏；节点内钢梁翼缘相当于压杆-拉杆模型中的拉杆,削弱节点内钢梁翼缘不利于抗震,增加栓钉和补强被削弱翼缘可提高节点抗震性能,为提高节点抗震性能应完全补强翼缘；(2)采用宽端板+节点钢板箍约束中柱节点核心区混凝土,同时提高了节点内组合梁翼缘高度范围箍筋体积配筋率；采用端板+节点钢板箍约束边柱节点核心区混凝土,节点内组合梁翼缘高度范围箍筋体积配筋率等同于翼缘削弱节点内组合梁翼缘高度范围箍筋体积配筋率,对4个宽翼缘钢筋连接节点进行了拟静力试验。结果表明,宽端板+节点钢板箍的约束效果要好于端板+节点钢板箍的约束效果；提高中柱节点内混凝土翼缘高度范围箍筋体积配筋率有利于节点抗震；对于边柱节点,在避免混凝土局部剪切破坏和局部受压破坏情况下,端板+节点钢板箍才能发挥对混凝土的约束作用；(3)在约束混凝土柱组合梁框架梁柱节点试验研究的基础上,对节点的受力机理进行了探讨,提出了梁柱节点受剪承载力计算公式,公式的计算值和试验值吻合较好且简单实用；(4)通过2个外包钢管+栓杆连接梁、1个现浇对比梁的重复加载试验和4个外包钢管+栓杆连接柱低周反复加载试验,研究了接缝两侧纵筋墩头锚固且灌浆料灌缝的外包钢管+栓杆连接方式的性能,并分析了其受力机理。外包钢管+栓杆连接梁未出现钢筋滑移现象,说明镦头锚固性能良好；装配整体式梁承载力和延性均好于现浇梁,说明外包钢管+栓杆连接方式可靠；外包钢管+栓杆连接柱均未在连接处破坏,延性较好,说明接缝两侧纵筋镦头锚固且灌浆料灌缝的外包钢管+栓杆连接方式可靠,抗震性能较好。当柱中纵筋较密时,提出了钢套筒锚固钢筋的构造措施；(5)研究了不同构造板-板连接节点的抗剪性能,并分析了其受力机理。结果表明,板侧做成齿槽形式,同时将板侧的下胡子筋焊接成三角架形式,既能有效抗剪且具有较好的延性。根据试验结果给出了板与板(梁)的连接构造；(6)研究了现浇框架梁柱节点、高强连续复合螺旋箍及不需要临时支撑的装配整体式约束混凝土柱组合梁框架施工技术。工程实践表明,给出的节点施工技术省时、省力,同时2种节点便于混凝土浇筑,施工现场反映良好；本文给出的高强连续复合螺旋箍施工技术能够满足施工要求且简单、快捷,效率比绑扎普通箍筋提高2倍以上；相对于普通箍筋,使用高强箍筋能节约钢筋50%；本文给出的装配整体式约束混凝土柱组合梁框架的施工工艺合理,其施工速度比其它装配整体式结构要快50%以上。
[Abstract]:As a new frame, the constrained concrete column composite beam frame has the characteristics of good self-weight and light anti-seismic performance. The existing specifications and procedures have no relevant provisions for the design and construction of such a frame. In this paper, the seismic performance, the node construction technology, the high-strength and continuous composite spiral hoop construction technology of the cast-in-place confined concrete column composite beam frame, the connection node of the prefabricated part of the combined beam frame of the integral restrained concrete column and the construction technology of the integral frame are assembled, and the system research is carried out. The main research contents and conclusions are as follows: (1) By the quasi-static test, the anti-seismic performance of the lower wing edge weakening node at the end plate 10-node steel plate band is studied. The results show that the restraint of the end plate and the steel plate band of the node changes the brittle shear failure of the node to the ductile shear failure; the flange of the steel beam in the node is equivalent to the pull rod in the pressure rod-pull rod model, and the edge of the steel beam in the node is weakened against the earthquake resistance, in that invention, the anti-seismic performance of the node can be improve by the increase of the bolt and the reinforcement of the weakened wing, so that the anti-seismic performance of the node should be fully reinforced; (2) the concrete in the core region of the column node in a wide-end plate and a node steel plate hoop constraint is adopted, in that invention, the ratio of the volume of the stirrups in the height range of the edge of the combined beam in the node is improve; the concrete in the core area of the side column node is restrained by the end plate and the node steel plate hoop, The volume distribution of the high-range stirrup of the combined beam in the node is equivalent to that of the high-range stirrups at the edge of the combined beam in the edge-weakening node, and the quasi-static test is carried out on the four wide-edge reinforcement connecting nodes. The results show that the restraint effect of the wide end plate + node steel plate hoop is better than that of the end plate and the node steel plate hoop, in that case of avoid the local shear failure and the local pressure failure of the concrete, the end plate and the node steel plate hoop can exert the constraint effect on the concrete; and (3) the stress mechanism of the node is discussed on the basis of the test research on the beam-column node of the combined beam of the confined concrete column, The calculation formula of the shear bearing capacity of the beam-column joint is proposed, the calculated value of the formula and the test value are in good agreement with the test value, and the formula is simple and practical; (4) the repeated loading test of one cast-in-place comparison beam and the low-cycle repeated loading test of the four outer-clad steel pipe and the bolt rod connecting column are carried out through two outer-clad steel pipe + bolt-rod connecting beams, In this paper, the performance of the connecting mode of the steel tube and the bolt rod for the anchoring of the longitudinal bars on both sides of the joint and the filling of the grouting material is studied, and the mechanism of its force is also analyzed. The steel pipe of the outer bag and the connecting beam of the bolt rod do not have a steel bar sliding phenomenon, so that the anchoring performance of the steel pipe joint is good; the bearing capacity and the ductility of the assembled integral beam are good in the cast-in-place beam, and the connection mode of the outer bag steel pipe and the bolt rod is reliable; the connecting column of the outer bag steel pipe and the bolt rod is not damaged at the joint, and the ductility is good; It is indicated that the connecting mode of the steel pipe and the bolt rod of the steel pipe with the longitudinal bars on both sides of the joint and the grouting material is reliable and the anti-seismic performance is good. When the longitudinal bar in the column is dense, the construction measures of the steel sleeve anchor reinforcement are put forward; and (5) the anti-shear performance of the plate-plate connecting node of different construction plates is studied, and the stress mechanism of the steel sleeve is analyzed. The results show that the side of the plate is in the form of a groove, and the lower beards on the side of the plate are welded into the form of a tripod, which can effectively resist shear and have good ductility. The connection structure of the plate and the plate (beam) is given according to the test results; (6) the construction technology of the cast-in-place frame beam-column node, the high-strength continuous composite spiral hoop and the assembled integral-restrained concrete column combined beam without temporary support is studied. The engineering practice shows that when the node construction technology is given, the labor-saving is labor-saving, and the two nodes are convenient for concrete pouring and the construction site reflects well; the high-strength continuous composite spiral hoop construction technology provided herein can meet the construction requirements and is simple and fast, The efficiency is more than 2 times higher than that of the conventional stirrups; with respect to the regular stirrups, the use of the high-strength stirrups can save the steel bar by 50%; the construction process of the assembled integral-restrained concrete column composite beam frame is reasonable, and the construction speed is more than 50% more than that of other assembled integral structures.
【学位授予单位】：大连理工大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU375.4;TU755

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