任意形状钢筋混凝土薄壁截面双轴压弯恢复力分析  

RESTORING FORCE ANALYSIS OF ARBITRARY REINFORCED CONCRETE THIN-WALLED SECTIONS SUBJECTED TO CYCLIC BIAXIAL BENDING WITH AXIAL LOAD

作　　者：张晋勋[1] 沈聚敏[2] 

机构地区：[1]北京城建集团 [2]清华大学

出　　处：《土木工程学报》1999年第2期34-40,共7页China Civil Engineering Journal

摘　　要：将任意形状钢筋混凝土薄壁截面划分成适当数目的薄壁直边，通过建立薄壁边截面的面内弯矩及轴力与相应变形之间的切线刚度关系合成了整个截面的双轴压弯恢复力模型。该模型可作为钢筋混凝土高层及高耸结构空间弹塑性地震反应分析的本构关系。A new multi-dimensional restoring force model is proposed for calculating arbitrary thin-walled R. C. section sub- jected to cyclic biaxial bending with axial load. The tangent stiffness matrix of the cross-section, which relates the vector increment of the three normal stress resultants { N, M_y, M_z }~ T to the vector increment of the section deformation measures { ε_0,φ_y, φ_z}~T, is established on the basis of the tangent stiffness matrix of every edge section of the thin- walled section, which relates the vector increment of the two nounal stress resultants { N_w, M_w } ~T to the vector increment of the edge section deformation measures {ε_(0w),φ_w}~ T. The latter is constructed on the basis of the bonding sur- face of the edge section, Which is defined as the locus of points in the space of the normalized { N_w, M_w}~ T, which correspond to ultimate strength. The bounding surface concept enables the model to produce realistic predictions of the nonlinear response of the edge section to arbitrary loading path in the space { N_w, M_w}~T.

关 键 词：钢筋混凝土 薄壁截面 恢复力模型 双轴压弯 

分 类 号：TU375.01[建筑科学—结构工程]