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中节点型钢混凝土梁低周反复荷载下抗剪试验及理论研究
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摘要
影响型钢混凝土梁的抗剪承载力有诸多因素,包括梁的剪跨比、加载方式、混凝土的强度等级、型钢的配钢率及型钢强度、含箍率及箍筋强度、型钢翼缘宽度与梁宽之比、型钢翼缘的混凝土保护层厚度以及节点配筋情况等。由于抗剪的机理比较复杂,影响因素较多,国内外对抗剪的计算理论和方法尚未取得一致的认识,对低周反复荷载下的抗剪性能研究得较少。本文通过试验,对低周反复荷载作用的型钢混凝土梁在不同剪跨比、配箍率下的抗剪承载力、延性、耗能性能、刚度及滞回性能等进行了研究。
     首先,对试件进行了低周反复荷载下的抗剪试验,对试验过程进行了详细的描述并对试验结果进行了初步的分析。给出了各试件最终破坏图片,并对破坏形态进行了分析与归类。给出了各试件的承载力和位移值,并对试件的应变分布和应力状态进行了分析,为进一步分析型钢混凝土梁的抗剪承载力和抗震性能提供了大量的实验数据。
     其次,基于混凝土剪压强度准则、极限平衡方程、本文试验数据及收集的试验资料所补充条件的基础上,推导出了反复荷载作用下型钢混凝土梁斜截面抗剪承载力的计算公式,该计算公式与实验情况符合较好。对剪切粘结滑移情况进行了分析,提出了以临界比(b_f/b)_(cr)为参数来控制不利的剪切粘结滑移破坏的出现。
     最后,根据试验数据,给出了型钢混凝土梁斜截面在低周反复荷载作用下的抗剪滞回曲线、滞回环及骨架曲线,对构件的延性、耗能以及刚度衰减退化规律进行了分析,提出低周反复荷载作用下的恢复力模型,为编制程序作非线性全过程分析参考。
Shear capacity for steel-reinforced concrete beam was effected by many factors, such as shear span ratio, ways of loading, concrete strength, sectional steel area ratio and steel strength, hoop reinforcement ratio and hoop reinforcement strength, steel flange ratio, thickness of concrete protecting steel flange and situation of reinforcement in nodal point. Because the mechanism of shear influenced by many factors is complex, the computation theory and methods of shear are not consistent with each other in world, and the research on shearing under cyclic load is less than others. Through test, this study investigates the shear strength, ductility, energy dissipation, rigidity and the hysteretic character of steel-reinforced concrete beams subjected to cyclic load in which the shear-span ratio or hoop reinforcement ratio is different from others.
    First, The test of steel-reinforced concrete beams subjected to cyclic load is done. The process of test is described in detail, and the results of test are analyzed in simple. The types of shear failure are analyzed and categorized. Bearing capacity and displacement of specimens are given. Strain distributions and stress conditions of specimens are analyzed. It provided a lot of test data for the further research on shear strength and seismic character of steel-reinforced concrete beam.
    Secondly, based on concrete compression-shear strength criterion and analysis of the experimental results, a formula of shear capacity of steel-reinforced concrete beam subjected to cyclic load is derived by equilibrium equations and by deformation conditions. The test results are in good agreement with the formula. The shear bond failure is analyzed and a new term, the critical steel flange ratio(bf/b)cr, is introduced to prevent the possible shear bond failure.
    Finally, according to the test results, hysteretic and skeleton curves of the SRC beams subjected to cyclic load are obtained. Based on these curves, ductility, energy dissipation and rigidity degradation rules are analyzed. And a skeleton model is proposed for non-linear analysis.
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