装配式弦支轻质混凝土集成楼盖的基本力学特性与参数分析  

Parametric Study on Mechanical Behavior of Assembled Cable Supported Lightweight Concrete Composite Floor

作　　者：乔文涛 张海影[1,2] Qiao Wentao;Zhang Haiying(School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Cooperative Innovation Center of Disaster Prevention and Mitigation for Large Infrastructure in Hebei Province(Shijiazhuang Tiedao University),Shijiazhuang 050043,China)

机构地区：[1]石家庄铁道大学土木工程学院,石家庄050043 [2]河北省大型基础设施防灾减灾协同创新中心(石家庄铁道大学),石家庄050043

出　　处：《天津大学学报（自然科学与工程技术版）》2018年第A01期127-134,共8页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(51208317);河北省自然科学基金资助项目(E2016210052);河北省高等学校科学技术研究项目重点资助项目(ZD2018250)

摘　　要：鉴于弦支混凝土集成楼盖结构自重大、刚度小、构造复杂、施工装配化程度低等问题,本文提出了一种新的型式,即装配式弦支轻质混凝土集成楼盖结构.对其进行构造精细化研究,预制楼板采用槽型肋板轻质混凝土钢筋桁架楼承板,保证了楼盖具有较大刚度,同时有效减小自重,施工装配化程度也得到提高;板件连接采用H型钢短梁,可增强结构在张拉过程中的整体性;撑杆采用单根竖杆,使构造大为简化.对此楼盖结构进行力学分析表明,适当增加结构的垂跨比可使其受力更加合理;增大板厚、肋梁高度或宽度可在一定程度上增大楼盖结构的整体刚度,但其自重也随之增大;此外,楼盖结构采用轻质混凝土时的内力与变形均比采用普通混凝土时减小,变形减小幅度在5,mm以内,内力减小幅度最大可达36.84%,,采用轻质混凝土时楼盖结构的力学性能得到明显改善.Considering the problems of cable supported concrete composite floor,such as heavy slab,small stiffness,complex fabrication,low construction and assembling efficiency,a new-style assembled cable supported lightweight concrete composite floor is put forward.The construction of this floor is researched in detail,and prefabricated trough-shaped lightweight concrete and steel truss composite slabs are employed,which ensures the large rigidity and light self-weight of the floor and significantly enhances the construction and assembling efficiency.The H-type short steel beams are adopted as connectors among the slabs,which can enhance the integrity of the structure during tensioning.The strut with one single vertical steel tube is adopted to simplify the construction.The results of mechanical analysis of this floor indicate that the structural efficiency can be improved with sag-span ratio appropriately increased.With the increase of slab thickness and ribbed beam depth or height,the global stiffness of the floor can be increased to a certain extent,but the self-weight of the structure will be increased as well.In addition,the internal force and deformation of the composite floor adopting light concrete are smaller than those adopting ordinary concrete,with the deformation reduced by within 5,mm and the internal force by 36.84%,,which shows that the mechanical properties of the composite floor structure are significantly improved with the use of lightweight concrete.

关 键 词：弦支结构 预应力组合结构 轻质混凝土 力学特性 

分 类 号：TU398.9[建筑科学—结构工程]