混凝土箱梁浇筑养护方案数值评估研究  

Numerical assessment for laying-curing project of concrete box girder

作　　者：陈衡治[1] 谢旭[1] 张治成[1] 苟昌焕[2] 

机构地区：[1]浙江大学土木工程学系,浙江杭州310027 [2]中华大学土木工程学系

出　　处：《浙江大学学报（工学版）》2006年第2期276-280,共5页Journal of Zhejiang University：Engineering Science

摘　　要：大体积混凝土结构在浇筑过程中水化放热会形成对结构不利的瞬态温度场,为此提出了一种混凝土箱梁浇筑温度场的数值分析方法.采用有限元方法模拟了箱梁混凝土的水化放热及其各种实际热边界条件,并通过与实测数据对比,验证了该方法的精度.以杭州湾跨海大桥非通航孔桥的70 m跨整体浇筑预制的大截面混凝土箱梁为例,利用该方法定量评估了各种浇筑养护方案控制水化热的效果,为工程选用了有效的水化热控制方案,能够有效防止混凝土产生早期温度裂缝.The hydration heat of mass concrete in laying produces the adverse transient temperature field in the structure. A method was presented to simulate the concrete box girder temperature field. The heat generation of hydration and the actual boundary condition were simulated with the finite element method （FEM）. The reliability was proved by comparson with measured data. Taking the laying-curing of the integrated-prefabrication 70 m-span concrete box girder of the non-navigable channel bridge in the Hangzhou Bay Bridge for example, the effectiveness of several schemes for controlling hydration heat was assessed quantitatively, and the most reasonable controlling scheme was selected to avoid early temperature cracks.

关 键 词：有限元评估 混凝土箱梁 水化热控制 温度场仿真 实际边界条件 

分 类 号：U442[建筑科学—桥梁与隧道工程]