组合楼板的全过程挠度分析

对组合楼板的挠度进行研究,其值直接取决于异型钢板与混凝土间连接的剪切刚度。基于架构理论,直接考虑连接的剪切刚度,提出计算组合楼板挠度的方法,考虑混凝土层正常裂缝和受压下塑性变形对结构刚度的影响。采用本方法,可获得这些影响因素从初始阶段至极限状态全范围的变化情况。对异型钢板与混凝土的连接试件进行试验,结果表明:其连接性能分3个阶段。每个阶段都有不同的剪切特性,用于计算楼板挠度。从加载初期至极限状态,分析Holorib异型板组合楼板变形试验值的变化。采用本方法计算的楼板变形值,与试验值吻合较好。     

组合楼板的全过程挠度分析

对组合楼板的挠度进行研究,其值直接取决于异性钢板与混凝土间连接的剪切刚度。基于架构理论,直接考虑连接的剪切刚度,提出计算组合楼板挠度的方法,考虑混凝土层在普通裂缝和受压下塑性变形对结构刚度的影响。采用本方法,可获得这些影响因素从初始阶段至极限状态全范围的变化情况。对异形钢板与混凝土的连接试件进行试验,结果表明:其连接性能分3个阶段。每个阶段都有不同的剪切特性,用于计算楼板挠度。从加载初期至极限状态,分析Holorib异形板组合楼板变形试验值的变化。采用本方法计算的楼板变形值与试验值吻合较好。     

Analysis of longitudinal shear behaviour for composite steel and concrete slabs

The strength of composite slabs depends mainly on the strength of contact between the steel sheeting and concrete. In the article a method of analyses for strength of the horizontal section of the composite slabs based on the theory of built-up bars, which gives one an opportunity to assess strength and the rigidity of contact is presented. The proposed method evaluates the influence of both plastic deformations of the concrete layer and cracks in the concrete on the rigidity of this layer and of the whole slab as well. Performed investigations in deformations and strength of the contact between steel sheeting and concrete allowed one to explore the behaviour of the contact from the start of loading up to the failure. During contact testing, influence of pre-compression forces on deformations and strength of the contact were investigated. The strength of horizontal section in 6 fragments of composite slab with ‘Holorib’ type profiled steel sheeting was investigated experimentally. In tests the thickness of concrete layer of the slab and concrete strength varied. Theoretical calculations for the strength of a horizontal section of experimental slabs were made in this investigation. Calculations were performed according to the method proposed by us with the application of the method of built-up bars. In calculations, rigidity of the contact between steel profiled sheeting and concrete as well as equivalent rigidity of a concrete layer with cracks were evaluated. Experimental and theoretical results of the strength of the horizontal section in composite slabs were compared. Comparison of results revealed that their agreement was sufficiently good.     

预制带肋薄板混凝土叠合板件受力性能试验研究

为便于工业化生产及现场拼装,对预制薄板(预制预应力混凝土矩形肋薄板)进行规格设计.进行2种不同跨度的4块预制薄板的静载试验,重点研究预制薄板的极限承载力、刚度及抗裂性能,结果表明:预制薄板满足施工阶段承载力要求,可作为无支撑体系模板.进行2块单跨叠合板件和1块两跨连续叠合板件的静载试验,重点研究叠合板件的整体受力性能、...     

探讨如何加强工程量清单计价合同的管理

工程量清单计价的合同贯穿在建设工程的实施过程中,文章探讨了计价方式、风险约定、合同备案、合同履行等方面的管理工作,以促进《建设工程工程量清单计价规范》的推广和执行。