预应力混凝土叠合空心楼板静力性能试验研究

发布时间：2018-05-18 11:39

本文选题：叠合空心楼板 + 叠合面　；参考：《建筑结构学报》2014年12期

【摘要】：结合现浇空心楼板与叠合楼板的优点,提出在一种预应力叠合楼板中布置筒芯内模形成的叠合空心楼板。进行了预制带肋底板叠合空心楼板、矩形底板叠合空心楼板及现浇空心楼板3种截面形式,2种截面尺寸分别为230 mm×500 mm、300 mm×600 mm的10块板带在单调荷载作用下的足尺模型试验。通过改变预制底板类别、筒芯内模的直径及其布置方式,对叠合空心板带的破坏形态、截面整体工作性能、正截面受弯承载力、短期刚度、叠合面水平受剪性能等进行了研究。结果表明:从开始加载到破坏,叠合空心楼板与现浇空心楼板表现出相似的受力特点和变形特征,按筒芯最薄弱翼缘处的工形截面计算叠合板的开裂荷载、正截面受弯承载力、平均裂缝间距等与实测值吻合较好;在所研究的板厚范围内,筒芯直径大小及布置方式的变化并未造成叠合面出现滑移开裂的现象,但不同程度地削弱了试件的受拉刚化作用,建议叠合空心楼板开裂后的短期刚度取控制截面的开裂刚度。通过叠合面受力分析,将横孔板顺筒肋宽度和上、下翼缘厚度的计算限值与楼板实际构造尺寸进行对比,实际工程中叠合面的抗剪强度可满足安全使用要求。两种预制底板预应力混凝土叠合空心楼板与预应力现浇空心楼板的总体受力性能较为接近,均可满足工程设计要求。
[Abstract]:Combined with the advantages of cast-in-place hollow slabs and composite slabs, the superimposed hollow slabs formed by the arrangement of tube core internal mold in a prestressed composite slabs are put forward. The full-scale model tests of 10 slabs with prefabricated ribbed floor, rectangular floor and cast-in-place hollow slabs of 230 mm 脳 500 mm / 300 mm 脳 600 mm respectively under monotonic load were carried out. By changing the type of prefabricated bottom plate, the diameter of the inner mold of the cylinder core and its arrangement, the failure pattern, the overall working performance of the section, the flexural bearing capacity of the normal section, the short-term stiffness and the horizontal shear behavior of the laminated hollow slab are studied. The results show that from the beginning of loading to failure, the superimposed hollow floor and cast-in-place hollow floor show similar mechanical and deformation characteristics. The cracking load and flexural bearing capacity of the composite slab are calculated according to the shape section of the weakest flange of the tube core. The average crack spacing is in good agreement with the measured values, and in the range of plate thickness studied, the variation of the diameter and arrangement of the tube core does not result in the phenomenon of slip cracking on the superimposed plane, but it weakens the tensile stiffening of the specimen to varying degrees. It is suggested that the short-term stiffness of the composite hollow slab after cracking should be controlled by the crack stiffness of the section. Through the stress analysis of the composite plane, the calculation limit value of the thickness of the upper and lower flange is compared with the actual structural size of the floor slab. The shear strength of the superimposed plane can meet the requirements of safety in practical engineering. Two kinds of prefabricated floor prestressed concrete composite hollow floor and prestressed cast-in-situ hollow floor have similar overall mechanical properties and can meet the engineering design requirements.
【作者单位】：湖南大学土木工程学院;湖南高岭建设集团股份有限公司;重庆大学;
【基金】：国家自然科学基金项目(51278179) 长沙市科技计划重点项目(K1205229-11)
【分类号】：TU378

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