异形柱节点抗剪承载力提高的措施
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摘要
框架节点一直被认为是框架结构最薄弱的环节,历次的震害也说明框架节点处经常发生剪切破坏。异形柱框架结构作为一种新型的结构形式,目前对其节点的研究和试验相对较少,所以有必要进行深入研究。异形柱框架结构由于梁的宽度与柱腹板及翼缘的厚度相同,柱子截面高厚比大且交接处钢筋密集,混凝土不容易振捣密实等原因,使得其梁柱节点比矩形梁柱节点更为薄弱。
本文基于Concrete smeared cracking model正交同性混凝土本构模型,应用ABAQUS非线性有限元分析程序,采用应力释放方法模拟混凝土开裂、压碎。计算表明,ABAQUS的结果与试验结果基本一致,验证了ABAQUS计算的可行性。
本文通过对三个异形柱(L形、T形、十形)节点及加腋的节点在弯矩、剪力、轴力共同作用下的有限元分析,获得了三种节点的基本性能,包括开裂前后的荷载传递路径、构件的应力分布,裂缝的产生、发展,及构件最后的破坏形态等。通过对计算结果的分析,得出异形柱节点的有限元分析和试验结果吻合;对加腋节点与常规节点在开裂荷载、极限承载力、裂缝的分布等方面进行了对比,表明了节点加腋后改善了其受力性能。本文得到的结果为异形柱框架结构在提高抗剪承载力方面提供了设计依据。
Reinforced concrete frame joint is always considered as the weakest region of frame structure, and usually occurred by shear failure in earthquakes.
The special-shaped column frame structure is a new type of structure and there are not enough experiments and research on the joints at present, so it is necessary to take further research.Because the thickness of column web and flange is equal to beam width, and the depth-thickness ratio of special-shaped column section is large, what more there are heavily-distributed steel bars in the joint of beam and column, concrete vibrating is not easy, the special-shaped column joints are weaker than the rectangle joints.
Based on the concrete smeared cracking isotropic constitutive model for concrete, a nonlinear finite element analysis programme ABAQUS is used. The cracking and crushing of concrete is simulated with stress-release method. It shows that the results of simulation is basic anastomotic with the experiment. Through calculation, the method is proved to be feasible.
This paper analyzed three special-shaped column joints (L、T、+) and three joints with welded haunch under bending moment, shearing force, and axis force, obtained basic properties of these jonits, which include load transfer path before and after cracking, stress distribution, occurrence and development of cracks and final failure mode of the joint. The results testifies very well with the test through analyzing the computational results.
Comparing the appended armpit joints with the normal joints in craze load, limit supporting capacity, crack distribution, the results showes that it improved its stress performance. The results can be provided design basis to the enhance shear strength for the specially shaped column frame structure.
本文基于Concrete smeared cracking model正交同性混凝土本构模型,应用ABAQUS非线性有限元分析程序,采用应力释放方法模拟混凝土开裂、压碎。计算表明,ABAQUS的结果与试验结果基本一致,验证了ABAQUS计算的可行性。
本文通过对三个异形柱(L形、T形、十形)节点及加腋的节点在弯矩、剪力、轴力共同作用下的有限元分析,获得了三种节点的基本性能,包括开裂前后的荷载传递路径、构件的应力分布,裂缝的产生、发展,及构件最后的破坏形态等。通过对计算结果的分析,得出异形柱节点的有限元分析和试验结果吻合;对加腋节点与常规节点在开裂荷载、极限承载力、裂缝的分布等方面进行了对比,表明了节点加腋后改善了其受力性能。本文得到的结果为异形柱框架结构在提高抗剪承载力方面提供了设计依据。
Reinforced concrete frame joint is always considered as the weakest region of frame structure, and usually occurred by shear failure in earthquakes.
The special-shaped column frame structure is a new type of structure and there are not enough experiments and research on the joints at present, so it is necessary to take further research.Because the thickness of column web and flange is equal to beam width, and the depth-thickness ratio of special-shaped column section is large, what more there are heavily-distributed steel bars in the joint of beam and column, concrete vibrating is not easy, the special-shaped column joints are weaker than the rectangle joints.
Based on the concrete smeared cracking isotropic constitutive model for concrete, a nonlinear finite element analysis programme ABAQUS is used. The cracking and crushing of concrete is simulated with stress-release method. It shows that the results of simulation is basic anastomotic with the experiment. Through calculation, the method is proved to be feasible.
This paper analyzed three special-shaped column joints (L、T、+) and three joints with welded haunch under bending moment, shearing force, and axis force, obtained basic properties of these jonits, which include load transfer path before and after cracking, stress distribution, occurrence and development of cracks and final failure mode of the joint. The results testifies very well with the test through analyzing the computational results.
Comparing the appended armpit joints with the normal joints in craze load, limit supporting capacity, crack distribution, the results showes that it improved its stress performance. The results can be provided design basis to the enhance shear strength for the specially shaped column frame structure.
引文
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