高强钢筋超高性能混凝土梁的使用性能研究

发布时间：2018-04-05 03:13

本文选题：超高性能混凝土　切入点：高强钢筋　出处：《哈尔滨工程大学学报》2015年10期

【摘要】：为研究高强钢筋超高性能混凝土(ultra-high performance concrete,UHPC)梁的正常使用性能,对6根UHPC梁进行了正截面弯曲性能试验,总结高强钢筋UHPC梁的荷载-挠度变化规律,研究其开裂弯矩、短期刚度、裂缝宽度及相应的计算方法。以《混凝土结构设计规范(GB 50010-2010)》为基础,根据试验结果回归出高强钢筋UHPC梁开裂弯矩的截面抵抗塑性影响系数表达式,确定了高强钢筋UHPC梁的钢筋应变不均匀系数、开裂截面内力臂系数和平均综合应变系数,从而得出高强钢筋UHPC梁短期刚度的计算公式,并按钢纤维混凝土计算方法对梁的短期刚度进行了修正计算和对比分析,为实际工程应用提供依据。
[Abstract]:In order to study the normal service performance of ultra-high performance concrete (UHPC) beams with high strength steel bar, six UHPC beams were tested on normal section bending behavior, and the load-deflection variation law of high strength reinforced UHPC beams was summarized, and the cracking moment and short term stiffness of the beams were studied.Crack width and corresponding calculation method.Based on the Code for Design of concrete structures (GB50010-2010), according to the test results, the expression of the coefficient of influence of section resistance to plasticity of high strength reinforced UHPC beams is regressed, and the non-uniform coefficient of steel bar strain of high strength reinforced UHPC beams is determined.The internal force arm coefficient of cracking section and the average comprehensive strain coefficient are obtained, and the calculation formula of short-term stiffness of high strength reinforced UHPC beam is obtained, and the short-term stiffness of the beam is revised and analyzed according to the calculation method of steel fiber concrete.It provides the basis for practical engineering application.
【作者单位】：北京工业大学城市与工程安全减灾省部共建教育部重点实验室;中交第一公路工程局国际事业部东非公司;唐山钢铁集团有限责任公司;
【基金】：国家自然科学基金资助项目(51378032) 教育部博士点基金资助项目(20131103110017) 北京市自然科学基金资助项目(8142005)
【分类号】：TU375.1

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