寒潮突袭对混凝土薄板温度应力的影响

摘要

When concrete thin plate suffers cold wave, it will produce great temperature stress as a result of the structure's uneven temperature variations, and even sometimes there would be some temperature cracks on the surface of concrete thin plate;and then these cracks would influence security of the structure. This phenomenon is very obvious in concrete thin plate at early ages. On the base of considering the effect of ages on concrete elastic modulus and intensity,this paper had a research about the early age cast-in-place floor,and got the corresponding conclusions and proposals to reduce the influence of cold wave by simulating the temperature stress of cast-in-place floors in different sizes at the disparate ages by ANSYS.%混凝土薄板在遭受寒潮作用时会因为结构温度变化不均匀而产生较大的温度应力,甚至出现温度裂缝,从而影响结构的安全,这种现象在早龄期的混凝土薄板结构上尤为明显.文章以早龄期现浇楼盖为例,在考虑龄期对混凝土弹性模量及强度的影响的基础上,利用ANSYS有限元软件对不同尺寸的现浇楼盖分别在不同龄期遭遇寒潮突袭时的温度应力情况进行了数值模拟,得出了相应的结论,并给出了降低寒潮突袭影响的建议.