摘要
归纳总结了钢-混组合梁桥负弯矩区混凝土板的抗裂设计方法,并且通过有限元分析研究了各抗裂措施的应用效果和适用性。在计算负弯矩区混凝土裂缝宽度的公式上,各国规范考虑的因素不同,精确度也不等;基于工业化发展理念,通过有限元建模分析,认为各裂缝控制方法中的预应力钢束法不适用于工业化建设;支座位移法和预加静载法虽然具有一定抗裂效果,但施工便利性差,且有所掣肘;增强配筋法的抗裂效果明显,但适用的跨径范围有限;UHPC湿接缝法作为一种基于材料优化的新型抗裂手段,兼具力学、施工、经济优势,但仍在探索阶段。有关于钢-混组合梁桥的负弯矩区混凝土板开裂仍是一项需不断研究、解决的问题。
This paper summarizes the crack resistance design method for the concrete plate in the negative moment zone of the steel-concrete composite girder bridge,and studies the application effect and applicability of each anti-cracking measure by the finite element analysis.In the formula for calculating concrete crack width in the negative moment zone,different countries consider different factors,and the accuracy is not the same.Based on the industrialization development concept,through the finite element modeling analysis,it is considered that the prestressed steel tendon method is not suitable for industrialization;the bearing displacement method and static pre-loading method have poor construction convenience and constraints although there is a certain anti-cracking effect;the reinforcement method has an obvious anti-cracking effect,but the applicable span range is limited.The UHPC wet joint method,as a novel anti-craking method based on material optimization,has advantages in mechanics,construction,and economy,but it is still in the exploratory stage.The concrete slab cracking in the negative moment zone of the steel-concrete composite girder bridge is still a problem that needs to be studied and solved properly.
作者
张军
ZHANG Jun(Linfen Branch of Shanxi Provincial Highway Bureau,Linfen,Shanxi 041000,China)
出处
《山西交通科技》
2022年第4期81-84,104,共5页
Shanxi Science & Technology of Transportation
