磷石膏模壳空心叠合楼盖有限元分析  

Finite Element Analysis of Hollow Composite Floor with Phosphogypsum Mold Shell

作　　者：李佳 邹祖银 LI Jia;ZOU Zuyin(School of Civil Engineering,Sichuan University of Science&Engineering,Zigong 643000,China;School of Civil Engineering,Sichuan Agricultural University,Chengdu 611830,China)

机构地区：[1]四川轻化工大学土木工程学院,四川自贡643000 [2]四川农业大学土木工程学院,成都611830

出　　处：《四川轻化工大学学报(自然科学版)》2024年第6期83-90,共8页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家自然科学基金项目(28002781)。

摘　　要：针对磷石膏模壳现浇密肋空心叠合楼盖和无梁楼盖在施工过程中会出现模壳移位的现象,以及施工过程复杂且不适用于装配式建筑的问题,提出一种新型预应力肋梁磷石膏模壳空心叠合楼盖体系。利用ABAQUS有限元软件建立27个新型叠合楼盖有限元模型,研究空腔模壳材料、预应力肋梁预制厚度、桁架高度以及受力钢筋直径等参数对新型空心叠合楼盖承载力的影响,并进行开裂荷载和承载力理论分析。结果表明,该新型预应力肋梁磷石膏空腔模壳叠合楼盖与传统混凝土叠合楼盖屈服荷载和最大荷载分别降低2.35%和3.71%,新型楼盖能满足正常使用要求;通过增大下弦钢筋直径可以提高该新型空心叠合楼盖的极限承载力;预制肋梁厚度与桁架高度在一定范围内能显著提高新型楼盖承载力,继续增大预制肋梁厚度和桁架高度,楼盖承载力明显下降。基于有限元分析结果,提出不同跨度条件下新型叠合楼盖参数最优尺寸,为该楼盖的实际运用提供理论参考。A new type of prestressed ribbed phosphogypsum hollow composite floor system is proposed to address the problem of formwork displacement,complex construction process,and unsuitability for prefabricated buildings in the construction of cast-in-place dense ribbed hollow composite floor and beamless floor.Using ABAQUS finite element software,27 new composite floor finite element models are established to study the effects of parameters such as cavity shell material,precast thickness of prestressed rib beams,truss height,and diameter of stressed steel bars on the bearing capacity of the new hollow composite floor.Theoretical analysis of cracking load and bearing capacity is also conducted.The results show that the yield load and maximum load of the new prestressed ribbed beam phosphogypsum cavity shell composite floor differ from those of the traditional concrete composite floor by 2.35%and 3.71%,respectively.The new floor can meet the requirements for normal use;by increasing the diameter of the lower chord steel bars,the ultimate bearing capacity of this new type of hollow composite floor can be improved;the thickness of prefabricated rib beams and the height of trusses can significantly improve the bearing capacity of the new floor system within a certain range.Continuing to increase the thickness of prefabricated rib beams and the height of trusses will significantly reduce the bearing capacity of the floor system.Based on the results of finite element analysis,the optimal parameter dimensions of the new composite floor under different span conditions are proposed,providing a theoretical reference for the practical application of the floor.

关 键 词：预应力肋梁 磷石膏模壳 钢筋桁架 叠合楼盖 ABAQUS 

分 类 号：TU375[建筑科学—结构工程]