应用增量法对菜园坝大桥Y构进行应力分析

在正常应力作用下,混凝土构件应力应变的非线性性质主要是由徐变引起的,工程上很难把弹性应变和徐变变形区分开.在大型混凝土结构中,由于徐变变形非常大,有时甚至相当于弹性变形,而大部分徐变变形是有害的,所以,更好地利用实测数据来分析其影响显得很重要.为了进一步分析收缩徐变对桥梁Y构产生的影响,在结构监控监测中采用阶段增量法来处理数据,通过对比分析得出比较理想的应力应变曲线,从而更客观地反映结构应力状况.实测数据分析表明:应用增量法后,结构的阶段累加应力值与实测值相比,有较大的变化,能够比较真实地反映出结构的实际应力状态,同时说明了此法的实用性.

Analysis of Stress for Y Frame of Caiyuanba Bridge Based on Incremental Method

Under the action of the common stress,the nonlinear characteristics of stressstrain results from the creep.However it is difficult to distinguish the elastic deformation and creep deformation.In large-scale concrete structures,the creep deformation is very large,which sometimes is even equal to that of elasticity,and the most majority of the creep deformation is harmful,so making most use of actual measurement to analyze the effect of the creep deformation exhibits great importance.In order to further study the effect of compression creep on the Y structure,stage incremental method is employed to treat the data in construction control,and the relatively ideal stress-strain curve can be obtained by comparison analysis,thus the structure stress condition is objectively reflected.The actual measurement analysis shows,when the incremental method is used, the value stage accumulation stress is rather variable to that of actual measurement,and can truly reflect the actual stress condition,meanwhile the practicability of this method can be illustrated.