静载作用下钢筋混凝土梁板结构的面力效应(Ⅰ)——理论模型

摘要

When a concrete structure is laterally restrained, the load carrying capacity is enhanced due to the so called compressive membrane action.To investigate the compressive membrane action on the reinforced concrete beam-slab structures, a new theoretical analytical model is proposed by modifying the Maximum Membrane Force Design Method (MMFM) in five aspects, in which the total strain plastic theory and strain rate plastic theory are combined and a series of explicit calculation formulae are derived to predict the total static load carrying capacity vs.mid-span deformation curves of reinforced concrete beam-slab structures under membrane force.The modified method is more rational than MMFM.%当钢筋混凝土结构的边界受到-定程度的约束时,其承载力由于面力的作用而显著提高,这种现象即为面力效应现象.为了系统研究钢筋混凝土梁板结构的面力效应,本文针对现有的最大面力设计方法(简称MMFM)的几点不足,提出了五项改进措施,并通过-系列分析推导,建立了-种新的理论计算模型.该理论模型采用全量应变塑性理论与增量应变塑性理论相结合的方法,能够推导出静载作用下考虑面力效应的钢筋混凝土梁板结构承载力-跨中变形全过程曲线的显式计算公式,相比于MMFM方法,本文所提出的理论计算模型更加准确合理.