基于全寿命周期的钢管混凝土结构分析理论及其应用  

Life-cycle based analytical theory of concrete-filled steel tubular structures and its applications

作　　者：韩林海[1] 杨有福[2] 杨华[3] 李威[1] Lin-Hai Han;Youfu Yang;Hua Yang;Wei Li(Department of Civil Engineering,Tsinghua Vniversity,Beijing 100084,China;State Key Laboratory,of Costal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]清华大学土木工程系,北京100084 [2]大连理工大学海岸和近海工程国家重点实验室,大连116024 [3]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《科学通报》2020年第28期3173-3184,共13页Chinese Science Bulletin

基　　金：国家自然科学基金重点项目(51838008)资助。

摘　　要：钢管混凝土是指在钢管中填充混凝土而成,且钢管及其核心混凝土能共同承受外荷载作用的结构形式.组成该类结构的材料间协同互补作用,可有效避免或延缓钢管发生局部屈曲及混凝土发生脆性破坏.钢管混凝土具有强度高、塑性和韧性好、抗震和抗火性能优越、施工方便等一系列技术优势,已在工业厂房、地铁站、输电杆塔、高层建筑以及桥梁等现代工程结构中得到广泛应用,取得了良好的建筑效果和经济效益.本文简要回顾了钢管混凝土结构的发展概况;针对全寿命周期服役过程中长期荷载和复杂受力两种常遇作用、地震和火灾两种极端作用工况,阐述了基于全寿命周期的钢管混凝土结构分析理论及其应用;最后,对钢管混凝土结构研究的发展趋势进行了简要展望.Concrete-filled steel tube(CFST) is a composite structure consisting of a steel tube filled with concrete. The steel tube and its concrete core work together to carry external loads applied to the structure. Due to the interaction between the two kinds of materials, i.e., the confinement effect of steel tube on the core concrete, CFST structures can effectively delay/avoid the local buckling of the steel tube and the brittle failure of the concrete core. The superior structural properties of CFST include high strength and stiffness, good ductility, excellent seismic and fire performances, and easy construction.Therefore, CFST structures have been extensively used in large-scale constructions including industrial plants, subway stations, transmission towers, high-rise buildings, and bridges, etc. CFST structures have also offered substantial benefits on architectural appearance and engineering economy.The confinement effect in CFST throughout its service-life essentially contributes to the structural advantages, whilst it has, at the same time, brought about enormous complexities in the corresponding load-resisting mechanisms. Firstly, an indepth understanding and accurate characterization of the confinement effect, and the development of some feasible constitutive models for the core concrete that facilitate the analysis and design of major infrastructures, becomes the key issue to be addressed. The salient loading factors in the service-life of CFST structures need to be considered in the constitutive models, such as long-term sustained load, low-cycle cyclic load and full-range fire. Secondly, the establishment of damage mechanism analysis and strength prediction models for CFST structures considering long-term sustained load, complex loading conditions, earthquake and fire becomes another key issue that needs to be resolved for the safety design of major CFST constructions.Life-cycle based damage mechanism and analytical theory of concrete-filled steel tubular structures have been investigated and established

关 键 词：钢管混凝土结构 全寿命周期 约束效应 约束效应系数 本构模型 分析理论 

分 类 号：TU398.9[建筑科学—结构工程]