大空间砖-混凝土组合结构弹塑性地震反应与计算倒塌研究

建立了大空间砖-混凝土组合结构弹塑性分析模型,分别采用纤维单元、多弹簧单元和斜撑单元模型模拟大空间结构的墙体完成结构弹塑性地震反应计算,研究了大空间结构计算模型和计算方法的适用性,提出了结构计算倒塌概念,认为纤维单元与多弹簧单元模型不适合用于模拟强震下大空间结构的连续墙体。进行了大空间砖-混凝土组合结构的弹塑性地震反应计算,研究了结构在小震、中震和大震作用下的受力特性和破坏形态,结果表明,这一大空间结构可以满足小震不坏和大震不倒的基本设计要求,分析发现了结构的薄弱部位,为结构抗震设计提供了依据。

Study on elasto-plastic seismic response and computational collapse of large-space brick-concrete composite structures

An elasto-plastic model of the large-space brickconcrete composite structure is built for the seismic analysis.The seismic response is investigated by using the fiber,multi-spring and diagonal embrace element to simulate the walls.The applicability of the models and the methods are discussed.The concept of computational collapse is proposed.The results show that the fiber and multi-spring elements are not suited for simulating the continuous wall of large-space structures under strong motions.The seismic behavior and damage shape of the structure under the small,moderate and strong earthquake motions are investigated respectively.The results show that the structure can meet the needs of foundational design,which is 'no damage under small earthquakes and no collapse under strong earthquakes'.The weak parts of the structure are investigated to provide the basis for aseismic design.