Simulation Research On Thermal Stress Of Mass Concrete During Construction Period

Concrete is indispensable in construction materials, for a class of large body structure,complex structures by force, strong integrity, etc., generally using mass concrete to build.Mass concrete structure with a large amount, structural thick, complex structures by force,concrete cracking limited value, etc.Cracks in practical engineering concrete structures common, through the concrete composition of microscopic research and engineering practice experience show that the concrete structure will be difficult to avoid cracks, in order to achieve scientific requirements that structural cracks in concrete provisions should be manageable. Research massive concrete temperature field distribution and variation of the actual project has the following two practical significance:The first analysis in existing concrete structures of crack formation, by cause cracks to crack reinforcement processing;The second simulation analysis planned or similar under construction in the construction phase and running of the concrete temperature field distribution and variation, which made possible a reasonable control temperature program, the maximum possible reduction of the dangers of crack yielded. In this paper, the cooling water pipes buried Yongning Yellow River Bridge of massive concrete pier caps for the establishment of a three-dimensional finite element model to analyze changes of the construction of massive concrete temperature field and comparative analysis of the measured data by finite element analysis results reason for the difference of the measured data and the resulting. The main contents of this paper are as follows:(1)access to relevant literature, summarize at home and abroad on the concrete temperature field of research application status;(2)describes consider concrete pipe cold of the calculation principle to the temperature field;(3) through field the measured data application Midas / civil finite element simulation software to analyze the distribution of the Yellow River Highway Bridge Yongning main pier construction of massive concrete temperature field caps timely process variation.(4) Measured Yongning Yellow River Highway Bridge Construction Concrete main pier caps temperature field variation in time away, and with the finite element analysis results were analyzed, draw a difference between reason and the cooling effect of the cold water pipe.(5) summarizes the results of the study results for similar projects under construction or proposed recommendations have practical meaning, while further study the time course of changes in the distribution of temperature field of concrete construction law making prospects.