现浇夹心保温剪力墙压弯受力性能及连接件承载能力研究

发布时间：2018-06-08 07:52

本文选题：剪力墙体系 + 夹心保温墙　；参考：《湖南大学》2015年硕士论文

【摘要】：针对目前建筑工程中常见各类保温墙体做法的一些局限性,本文提出一种新型现浇夹心保温剪力墙。现浇夹心保温剪力墙(以下简称夹心墙)由外侧混凝土层、夹心保温层、内侧钢筋混凝土结构层和连接件构成。保温板上开有孔洞,两侧混凝土在孔洞处形成混凝土短柱,短柱和内部加强筋共同构成夹心墙连接件。两侧混凝土层在连接件的作用下协同受力,共同承担竖向和水平荷载;为了确保其保温效果,在保温板孔洞处设置隔热片,隔断孔洞处的冷桥。该夹心墙兼具了保温、承重功能,满足了当今建筑在节能设计方面的要求。本文对3片夹心墙体试件进行了恒定竖向荷载和水平荷载共同作用下的压弯受力性能试验,运用ABAQUS有限元分析程序对夹心墙的压弯试验进行了模拟和相关影响参数分析。最后对夹心墙的施工工艺提出了优化设计,改进了连接件的做法,并针对改进后的连接件进行了连接件剪切承载力试验。夹心墙的压弯性能试验表明:3个试件在固定竖向力(轴压比为0.1)和水平力的共同作用下均发生压弯破坏,受力过程和极限承载力基本相同,试件设计的变化参数(连接件布置、隔热片设置)对其压弯受力性能没有影响;两侧混凝土层在加载过程中变形协调一致,共同受力;可以按照我国现行《高规》中的剪力墙计算公式对试件的压弯承载力进行计算。ABAQ US有限元计算和参数分析表明:模拟计算得到的试件荷载-位移曲线、破坏形态和极限承载力与试验结果基本吻合;夹心墙的受弯承载力随着试件轴压比、墙体混凝土强度、竖向分布钢筋强度的增大而增大,随着墙体剪跨比的增大而减小,连接件的间距尺寸、横向分布钢筋的强度则对夹心墙承载力没有影响。为了简化施工工艺,改用喷涂砂浆的施工方法进行夹心墙外侧的施工,同时改进了墙体混凝土的浇筑方式和连接件的做法。新型连接件的剪切性能试验表明:在接触面错动位移作用下,连接件处的砂浆短柱承担了主要的剪切荷载,剪切承载力能够满足工程设计、使用的要求。本文的研究可以为该现浇夹心保温剪力墙的施工方法、压弯承载力的设计提供一定理论依据和建议。
[Abstract]:In view of the limitations of various kinds of insulation wall in building engineering at present, a new type of cast-in-place sandwich insulation shear wall is proposed in this paper. The cast-in-place sandwich thermal insulation shear wall (hereinafter referred to as the sandwich wall) consists of the outer concrete layer, the sandwich insulation layer, the inner reinforced concrete structure layer and the connectors. There are holes in the insulation board, and concrete short columns are formed at the holes on both sides of the concrete. The short columns and the internal reinforcement bars together form the sandwich wall connectors. In order to ensure the thermal insulation effect, the insulation sheet is arranged at the hole of the insulation plate to separate the cold bridge at the hole of the insulation plate. The sandwich wall has the function of heat preservation and load bearing, which meets the requirements of energy-saving design of today's buildings. In this paper, three specimens of sandwich wall are tested under the action of constant vertical load and horizontal load. The finite element analysis program Abaqus is used to simulate the compression and bending test of sandwich wall and the related influence parameters are analyzed. Finally, the optimum design of the construction technology of the sandwich wall is put forward, and the method of connection is improved, and the shear bearing capacity test of the joint is carried out for the improved joint. The compression and bending behavior tests of the sandwich wall show that the three specimens are subjected to compression and bending failure under the combined action of fixed vertical force (axial compression ratio 0.1) and horizontal force, and the stress process is basically the same as the ultimate bearing capacity. There is no effect on the compression and bending behavior of the two sides of concrete layer, the deformation of both sides of the concrete layer is consistent during the loading process, and the common force is shared. According to the calculation formula of shear wall in China's current "High gauge", the load-displacement curve of specimen obtained by simulation calculation can be calculated by means of finite element calculation and parameter analysis of ABAQ US. The failure mode and ultimate bearing capacity of the sandwich wall are basically consistent with the test results, the flexural capacity of the sandwich wall increases with the increase of the axial compression ratio of the specimen, the strength of the wall concrete and the strength of the vertical distributed steel bar, and decreases with the increase of the shear span ratio of the wall. The size of the joint spacing and the strength of the transverse distribution bar have no effect on the bearing capacity of the sandwich wall. In order to simplify the construction technology, the construction method of sprayed mortar is used to construct the outside of the sandwich wall, and the pouring mode of wall concrete and the method of connecting parts are improved at the same time. The shear behavior test of the new type joint shows that under the action of the dislocation displacement of the contact surface, the mortar short column at the connecting part bears the main shear load, and the shear bearing capacity can meet the requirements of engineering design and application. The research in this paper can provide some theoretical basis and suggestions for the construction method of the cast-in-place sandwich heat preservation shear wall and the design of the compression and bending bearing capacity.
【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】：TU398.2

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