FRP约束SRHC压弯构件正截面承载力计算

综合考虑钢骨混凝土柱的受力特性,提出一种在不增加构件截面尺寸的情况下,既提高其承载能力,又增加其抗剪能力和抗震延性的一种新型柱模式——FRP(纤维增强复合材料)与SRHC(钢骨高强混凝土)组合柱.在混凝土内部埋设型钢,形成SRHC柱,在进行施工的同时或待结构主体施工至一定高度后,再用FRP布横向包裹及纵向粘贴SRHC柱,形成FRP-SRHC组合柱.考虑到FRP钢骨混凝土柱多数是处于偏心受压状态,因此,分析环向FRP布对核心混凝土的约束作用及纵向FRP布对钢骨混凝土柱正截面承载力的贡献,确定FRP约束SRHC组合柱的界限相对受压区高度,分别给出FRP约束SRHC柱大(小)偏心受压柱的承载力计算公...

Calculation of Normal Section Bearing Capacity of FRP-Confined SRHC Compression-Bending Columns

Considering comprehensively the bearing capacity of SRC(steel-reinforced concrete) columns ,a new column model,i.e.,the composite FRP-confined SRHC column,is put forward without change in sectional area,which can increase the bearing capacity,shear strength and anti-earthquake ductility.The section steel is embedded in the RC column to become an SRHC column of which the surface is then wrapped spirally and stuck on vertically by FRP sheet during construction or at the moment the main structure has been built to a certain height,thus forming a composite FRP-confined SRHC column.And most of such composite columns are eccentrically loaded.The confining effect of spirally wrapped FRP sheet on RC and the contribution the vertically stuck FRP sheet made to the normal section bearing capacity of SRHC column are therefore analyzed to determine the boundary hight of the compressive region of the composite column.A formula is given to calculate the normal section bearing capacity of the composite FRP- confined SRHC column under eccentric load.