钢筋混凝土异形柱的延性分析-结构工程专业论文.docxVIP

Ductility Ductility analysis of special—shaped reinforced concrete columns ABSTRACT At present，lightweight framed structures with special—shaped R．C．columns are applied widely in recent years，but the research of special-shaped columns is p001． The special-shaped columns exists in its advantages and disadvantages because of uniqueness of section shape．The paper，based on the ductile analysis method of rectangle columns，put forwards the factors that determinates the characteristic of the sections of special·shaped columns，including axial compression rmio，the worst load orientation，shear-span ratio，spacing oflateral reinforced and change of section． In the paper，the method of nonlinear analysis of special—shaped R．C．columns is put forward．A computer program for a full range analysis of special—shaped columns is complied．On the basis of related papers，the full path of stress strain relation of concrete and the sliding of longitudinal reinforcement anchoring are all considered，simultaneous，the restriction effect for concrete by thichening of stirrrups is also included． According to generating finite elements model by meshing special-shaped columns，a computer program using the digital iteration method for full range analysis of special—shaped columns is complied．Using the finite procedure ANSYS software by nonlinear analysis，based on the analytical results of 1 9 sets of L-shaped，T-shaped and+一shaped columns，the ductile behavior of the special-shaped columns considering the axial compression ratio and the load orientation is investigated． Key words：special-shaped R．C．columns：ductility：nonlinear analysis；model of reinforeed concrete 插图清单图1．1异形柱截面形式 插图清单 图1．1异形柱截面形式 l 图2．1广义力—变形曲线 14 图3．1不同加载角时L型柱中和轴位置 00 O·．．．．．． 18 图3．2不同加载角时T型柱中和轴位置 18 图3．3不同加载角时十字型柱中和轴位置 18 图3．4构件加载方向 19 图3．5 T、L截面(翼缘位于截面受拉区) 21 图3．6 T、L截面(翼缘位于截面受压区) 21 图3．7十字形截面 21 图3．8钢筋混凝土异形柱肢长与肢厚比的定义 22 图3．9异形柱的配筋方式 24 图3．10异形柱中暗柱设置的位置 28 图4．1钢筋的本构模型 32 图4．2混凝土的本构关系 38 图4．3混凝土单轴受压应力—应变关系 39 图4．4钢筋的应力应变关系 39 图4．5 L形