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A new protocol for testing RC beams in combined shear and tension loading conditions
Materials and Structures ( IF 3.8 ) Pub Date : 2020-01-21 , DOI: 10.1617/s11527-020-1441-y
Duc Toan Pham , Nicolas Pinoteau , Bernard Fouré , Salim Abouri , Ménad Chenaf , Philippe Rivillon , Romain Mège

The problem of the shear strength of reinforced concrete members which are simultaneously subjected to an axial tension occurs in a number of practical cases such as continuous beams rigidly connected to columns (where tension results from the restraint of the axial variation of length due to concrete shrinkage and temperature variation), columns or shear walls and foundation piles in beam-column or shear wall-slab frames subjected to high horizontal forces. An original protocol is proposed for testing in these loading conditions, where reaching shear failure represents the main difficulty for designing specimens. This protocol makes use of an original and reliable test setup, in which two horizontal forces are symmetrically applied apart the beam axis, making it possible to generate a constant axial force and a constant negative bending moment along span. The loading protocol is oriented towards a defined value of axial force, while shear at failure may be combined with a negative or positive moment. The loading path for bending moment and axial force is chosen as to remain inside the normal force-bending moment failure curve. The failure in shear occurs at constant axial force and increasing bending moment. The whole procedure was first implemented to perform three rather simple preliminary tests. Their results show the technical feasibility of this protocol. Some limitation of initial parameters was evidenced. So better parameters were chosen for carrying out the main experimental program (presented in another paper).

中文翻译:

在剪切和拉伸载荷条件下测试 RC 梁的新协议

同时受轴向拉力的钢筋混凝土构件的抗剪强度问题出现在许多实际情况中,例如与柱刚性连接的连续梁(其中拉力是由于混凝土收缩引起的轴向长度变化受到限制而产生的)和温度变化),梁柱或剪力墙板框架中的柱或剪力墙和基础桩承受高水平力。提出了在这些加载条件下进行测试的原始协议,其中达到剪切破坏是设计试样的主要困难。该协议利用原始且可靠的测试设置,其中两个水平力对称地施加在梁轴上,使得沿跨度产生恒定的轴向力和恒定的负弯矩成为可能。加载协议面向轴向力的定义值,而破坏时的剪切可能与负或正力矩相结合。弯矩和轴向力的加载路径选择为保持在法向力-弯矩破坏曲线内。剪切破坏发生在恒定的轴向力和增加的弯矩下。首先实施整个程序以执行三个相当简单的初步测试。他们的结果显示了该协议的技术可行性。证明了初始参数的一些限制。因此选择了更好的参数来执行主要实验程序(在另一篇论文中介绍)。加载协议面向轴向力的定义值,而破坏时的剪切可能与负或正力矩相结合。弯矩和轴向力的加载路径选择为保持在法向力-弯矩破坏曲线内。剪切破坏发生在恒定的轴向力和增加的弯矩下。首先实施整个程序以执行三个相当简单的初步测试。他们的结果显示了该协议的技术可行性。证明了初始参数的一些限制。因此选择了更好的参数来执行主要实验程序(在另一篇论文中介绍)。加载协议面向轴向力的定义值,而破坏时的剪切可能与负或正力矩相结合。弯矩和轴向力的加载路径选择为保持在法向力-弯矩破坏曲线内。剪切破坏发生在恒定的轴向力和增加的弯矩下。首先实施整个程序以执行三个相当简单的初步测试。他们的结果显示了该协议的技术可行性。证明了初始参数的一些限制。因此选择了更好的参数来执行主要实验程序(在另一篇论文中介绍)。弯矩和轴向力的加载路径选择为保持在法向力-弯矩破坏曲线内。剪切破坏发生在恒定的轴向力和增加的弯矩下。首先实施整个程序以执行三个相当简单的初步测试。他们的结果显示了该协议的技术可行性。证明了初始参数的一些限制。因此选择了更好的参数来执行主要实验程序(在另一篇论文中介绍)。弯矩和轴向力的加载路径选择为保持在法向力-弯矩破坏曲线内。剪切破坏发生在恒定的轴向力和增加的弯矩下。首先实施整个程序以执行三个相当简单的初步测试。他们的结果显示了该协议的技术可行性。证明了初始参数的一些限制。因此选择了更好的参数来执行主要实验程序(在另一篇论文中介绍)。
更新日期:2020-01-21
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