高强钢筋钢纤维RPC简支梁受剪承载力试验性能研究

发布时间：2019-04-29 19:05

【摘要】：为了探究RPC简支梁受剪承载力的影响性能,通过对6根2组剪跨比为2.25和3.0的矩形梁进行受剪性能试验,分析2组不同剪跨比的试验梁,其配箍率对受剪承载力的影响;将试验结果与普通钢筋混凝土修正压力场公式,以及我国规范公式的计算结果进行对比分析;考虑配箍率与钢纤维的影响,修正RPC主拉应力-应变本构关系,并编制程序进行迭代计算,得出钢纤维对承载力的贡献率。研究发现:配箍率和剪跨比对试验梁承载力的影响均比较明显。配箍率≤0.252%时,配箍率越大,试验梁的受剪承载力越大,但随着配箍率的继续增大,试验梁呈弯剪破坏趋势,配箍率-荷载曲线趋于平缓;钢纤维对RPC梁抗剪承载力的影响不容忽视,而且对无腹筋梁的影响大于有腹筋梁;基于修正压力场理论模型的改进计算程序用于计算高强钢筋RPC梁的抗剪承载力,其理论值与试验值吻合良好,具有一定的可信度和实用性。
[Abstract]:In order to investigate the shear bearing capacity of RPC simply supported beams, two groups of rectangular beams with 2. 25 and 3. 0 shear-span ratios were tested, and two groups of test beams with different shear-span ratios were analyzed. The effect of stirrups ratio on shear capacity; The test results are compared with the modified pressure field formula of ordinary reinforced concrete and the calculation results of the code formula in our country. Considering the influence of stirrups ratio and steel fiber, the principal tensile stress-strain constitutive relation of RPC is modified, and the iterative calculation program is compiled to obtain the contribution rate of steel fiber to the bearing capacity. It is found that the influence of stirrups ratio and shear-span ratio on the bearing capacity of the test beam is obvious. When the ratio of stirrups is 鈮，

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