连续刚构桥零号块温度应力模拟分析  

TEMPERATURE STRESS SIMULATION ANALYSIS OF CONTINUOUS RIGID FRAME BRIDGE WITH ZERO BLOCK HYDRATION HEAT

作　　者：李可欣[1] 宁晓骏[1] 

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《低温建筑技术》2016年第7期46-49,共4页Low Temperature Architecture Technology

基　　金：国家自然科学基金(51068012);云南省交通厅科技项目(2013(c)07)

摘　　要：为了深入研究水泥水化反应对连续刚构桥零号块的影响,文中以云南马过河大桥为例,通过有限元软件对零号块的水化热作用进行模拟分析,探讨了水化热对大体积混凝土零号块的影响。研究结果表明,零号块在浇筑完成后产生的水化热会使内部温度升高,形成较大的温度梯度,从而会产生一定的拉应力。尤其是在混凝土较厚的地方,产生的拉应力可能将混凝土拉坏。现阶段采用的分层多次浇筑的方法也会由于下层混凝土的约束而在约束边界处产生一定的拉应力,需要特别注意。In order to further study the effect of cement hydration reaction on the zero block of continuous rigid frame bridge,this paper takes the Yunnan Ma Guo River Bridge as an example,and analyzes the effect of the hydration heat on the zero block of large volume concrete by using the finite element software. The results show that the hydration heat generated by the zero block in the pouring water will increase the internal temperature,and form a large temperature gradient,which will produce a certain tensile stress. Particulaly in places where the concrete is thick,the tensile stress may damage the concrete. At this stage,the method of layered multiple casting is used to produce a certain tension stress at the constraint boundary due to the constraints of the concrete,special consideration is required.

关 键 词：连续刚构 零号块 水化热 分层浇筑 

分 类 号：TU375[建筑科学—结构工程]