本文提出在登向荷侢作用下具有平行弦杆的空腹桁架的一种计算方法。这个方法是取桁架中任一节间的闭合框架为单元体用力法来推导公式。这个方法与弯矩分配法等其他方法比较,它不用进行弯矩分配与传递,可由公式及很简单的平衡条件直接算...本文提出在登向荷侢作用下具有平行弦杆的空腹桁架的一种计算方法。这个方法是取桁架中任一节间的闭合框架为单元体用力法来推导公式。这个方法与弯矩分配法等其他方法比较,它不用进行弯矩分配与传递,可由公式及很简单的平衡条件直接算出各杆件的端弯矩,计算较简捷,且计算步骤容易掌握。所得的计算方程与三 X 方程相似,但本文将联立方程解出,归纳为一个公式,先算出其中一杆件的端弯矩,然后依次算出其他杆端弯矩,从而,无须再解联立方程式。展开更多
Plain round bars were commonly used as main bars in the design of RC （reinforced concrete） buildings prior to the 1970s. According to previous research investigating the seismic performance of reinforced concrete me...Plain round bars were commonly used as main bars in the design of RC （reinforced concrete） buildings prior to the 1970s. According to previous research investigating the seismic performance of reinforced concrete members constructed with plain round bars, the strength of those members did not reach the calculated flexural strength due to bond slippage of main bars before yielding. It is important, therefore, to investigate the hysteretic bond mechanisms of plain round bars in concrete. In this research, analytical models were proposed to predict hysteretic bond-slip mechanisms between plain round bar and concrete depending on the results of experiments performed by the authors. In addition, the energy absorption capacity and the equivalent viscous damping factors obtained from the experimental results and analytical models are discussed. As a result of comparisons between the experimental data and the analysis models, good agreements were obtained.展开更多
文摘本文提出在登向荷侢作用下具有平行弦杆的空腹桁架的一种计算方法。这个方法是取桁架中任一节间的闭合框架为单元体用力法来推导公式。这个方法与弯矩分配法等其他方法比较,它不用进行弯矩分配与传递,可由公式及很简单的平衡条件直接算出各杆件的端弯矩,计算较简捷,且计算步骤容易掌握。所得的计算方程与三 X 方程相似,但本文将联立方程解出,归纳为一个公式,先算出其中一杆件的端弯矩,然后依次算出其他杆端弯矩,从而,无须再解联立方程式。
文摘Plain round bars were commonly used as main bars in the design of RC （reinforced concrete） buildings prior to the 1970s. According to previous research investigating the seismic performance of reinforced concrete members constructed with plain round bars, the strength of those members did not reach the calculated flexural strength due to bond slippage of main bars before yielding. It is important, therefore, to investigate the hysteretic bond mechanisms of plain round bars in concrete. In this research, analytical models were proposed to predict hysteretic bond-slip mechanisms between plain round bar and concrete depending on the results of experiments performed by the authors. In addition, the energy absorption capacity and the equivalent viscous damping factors obtained from the experimental results and analytical models are discussed. As a result of comparisons between the experimental data and the analysis models, good agreements were obtained.
