摘要
本文针对预应力混凝土与普通混凝土不同的受力特点，提出了适合于分析预应力混凝土结构抗震性能的非线性有限元模型。该模型首先将混凝土结构离散为杆单元，然后对各杆单元按分层组合原理分成许多混凝土层、预应力钢筋层和普通钢筋层，计算混凝土分层单元、预应力钢筋和普通钢筋的应力和应变，最后，根据钢筋与混凝土之间的粘结-滑移关系调整钢筋变形，根据混凝土弹性模量调整结构及杆单元变形。通过对普通混凝土构件和三个预应力混凝土构件滞回曲线的分析，验证且调整模型参数．本文还对一幢四层预应力混凝土框架结构在不同地震动激励下的反应进行对比分析，说明按现行规范设计的预应力混凝土结构抗震性能较好．
In view of the different mechanical performance between prestressed concrete and reinforced concrete, a nonlinear flnite element model, which is suitable to analysis of seismic performance of prestressed concrete, is proposed. In this model, a concrete structure would first be divided into bar units. Then each bar unit would be separated into rnany concrete tiers, tendon tiers and steel bar tiers. According to the separating and combining method,stresses and strains of concrete tiers, tendons and steel bars could be calculated. Finally deformation of steel would be adjusted according to bond-slip relationship between steel and concrete, and deformation of the structure or bar units would be adjusted when the elastic moduli of concrete changes. Hysteresis loops of a reinforced concrete member and three prestressed concrete members are compared, which proves that this model is feasible. By theway, some parameters of this model are adjusted. The seismic responses of a four-storey prestressed concrete frame under-different earthquake excitations are calculated and compared, which shows that the seismic performance of prestressed concrete structures designed on the basis of current seisndc code is acceptable and satisfactory.
出处
《地震工程与工程振动》
CSCD
北大核心
2000年第2期44-50,共7页
Earthquake Engineering and Engineering Dynamics
关键词
地震反应
有限元
非线性分析
预应力混凝土结构
prestressed concrete, seismic response, finite element, nonlinear analysis
