【作者】 谭品峰；

【导师】 王铁成；

【作者基本信息】 天津大学 ， 结构工程， 2004， 硕士

【摘要】 《混凝土结构设计规范》(GBJ50010-2002)颁布与实施以后，HRB400 钢筋作为主导钢筋被广泛应用到工程结构中。高强钢筋被用来作为箍筋有可能会造成钢筋混凝土梁中出现过宽的斜裂缝。由于没有一个明确的理论依据，规范中并未给出有关钢筋混凝土梁受剪斜裂缝宽度的计算公式，建立有关计算理论并在此基础上推导计算公式一直以来都是重点研究对象之一。本文通过对 8 根配置高强箍筋的试验研究的基础上，分析并研究了剪跨区裂缝的发生、发展过程，并对混凝土强度等级、钢筋强度以及箍筋间距等影响因素进行了讨论。研究表明，集中荷载作用下钢筋混凝土梁剪跨区裂缝宽度的发展分为两个阶段，第一阶段，裂缝宽度最大值发生在梁底附近，属于垂直裂缝受剪力影响，第二阶段，裂缝宽度出现在梁腹部，属于斜裂缝。通过试验研究及理论分析，本文得出了集中荷载作用下钢筋混凝土梁剪跨区裂缝最大宽度的计算公式。最后通过对试验数据的验算表明该公式满足一定的精度要求。更多还原

【Abstract】 HRB400 steel has been widely used in the engineering structure, after the Code for design of concrete structure (GB50010-2002) had been promulgated and implemented. Used HRB400 steel as stirrup, the oversized diagonal crack maybe appears in the concrete beams. The formula of calculating the width of diagonal crack is not provided directly in the code because the theory is not perfectly. How to establish the calculate theory and deduce the formula is one of the emphases in the research. Based on the experiment studies of 8 concrete beams with high-strength stirrup, the development of the diagonal crack and the influence of the distance between stirrups, the strength of concrete and the strength of steel were discussed in this paper. And then constituted the formula to calculate the maximum width of the diagonal crack in the beams under the concentrate load. The development of the crack in the shear period of the beam under the concentrate load should be divided in two parts. In The first part, the max width of the crack is located near the bottom of the beam produced by the bend and shear, and in the second part the max width of the crack is located in the middle height of the beam. The forums of the max width of the crack in the shear pear period of the beam were deduced based on the analyses of the experiment. at last by validating the experiment data it was concluded that the exactitude of the formula is adequate.更多还原