CAJ | 학술논문

　　在节段预制拼装桥梁的墩顶节段，常常采用后浇横隔梁的方式来减轻吊装重量。后浇横隔梁在体量上属于大体积混凝土，混凝土水化热问题会引起一些部位拉应力过大，如控制措施不合理，往往会导致预制梁段在施工阶段的开裂。本文结合南京长江第四大桥的引桥工程，基于三维瞬态温度场理论，利用通用有限元程序ANSYS对墩顶梁段现浇块的水化热效应进行了数值仿真，研究箱梁水化热温度场和应力场的分布规律。分析结果表明，水化热引起的箱梁腹板外侧拉应力水平足以导致混凝土开裂，在水化热测试试验中也观测到了箱梁腹板外侧的纵向微裂缝，与分析相符。在研究水化热温度场和应力场分布规律的基础上，进行了控制水化热温度应力的措施研究，在实桥施工中证实是切实有效的。
　　재절단예제병장교량적돈정절단，상상채용후요횡격량적방식래감경조장중량。후요횡격량재체량상속우대체적혼응토，혼응토수화열문제회인기일사부위랍응력과대，여공제조시불합리，왕왕회도치예제량단재시공계단적개렬。본문결합남경장강제사대교적인교공정，기우삼유순태온도장이론，이용통용유한원정서ANSYS대돈정량단현요괴적수화열효응진행료수치방진，연구상량수화열온도장화응력장적분포규률。분석결과표명，수화열인기적상량복판외측랍응력수평족이도치혼응토개렬，재수화열측시시험중야관측도료상량복판외측적종향미렬봉，여분석상부。재연구수화열온도장화응력장분포규률적기출상，진행료공제수화열온도응력적조시연구，재실교시공중증실시절실유효적。
For the pier segment of the segmental precast bridge,the diaphragm is often casted in place to reduce the lifting weight. Considering the volume of the diaphragm,it belongs to massive concrete,in which concrete hydration heat may cause excessive tensile stress in some parts. Without right control measures often lead to cracking of the precast segments during the construction phase. Based on three-dimensional transient tem-perature field theory,numerical simulation with ANSYS was performed,to investigate the distribution law of hydration heat temperature and stress. The analysis shows that,the tensile stress at the outside of the webs is suf-ficient to lead to concrete cracking,longitudinal micro-cracks along the webs is also observed during the hydra-tion heat test. With the distribution of temperature and stress obtained from numerical simulation,a series of con-trol measures were proposed and adopted to the Fourth Nanjing Yangtze River Bridge approach project,which were proved to be feasible and effective.