scholarly journals STUDY ON NATURAL PERIOD OF PRESTRESSED CONCRETE FRAME STRUCTURE FOR ULTIMATE STRENGTH DESIGN

1996 ◽  
Vol 61 (488) ◽  
pp. 137-143
Author(s):  
Kei FUKANO ◽  
Tadashi NAKATSUKA ◽  
Ichizou KISHIMOTO ◽  
Kazuo SUZUKI
Keyword(s):  
Ultimate Strength ◽  
Prestressed Concrete ◽  
Frame Structure ◽  
Natural Period ◽  
Concrete Frame ◽  
Strength Design

scholarly journals Experimental Study of a New Precast Prestressed Concrete Joint

2018 ◽  
Vol 8 (10) ◽  
pp. 1871 ◽  
Author(s):  
Xueyuan Yan ◽  
Suguo Wang ◽  
Canling Huang ◽  
Ai Qi ◽  
Chao Hong
Keyword(s):  
Energy Dissipation ◽  
Seismic Performance ◽  
Prestressed Concrete ◽  
Precast Concrete ◽  
Concrete Strength ◽  
Frame Structure ◽  
Loading Test ◽  
Concrete Frame ◽  
Concrete Joints ◽  
Precast Prestressed Concrete

Precast monolithic structures are increasingly applied in construction. Such a structure has a performance somewhere between that of a pure precast structure and that of a cast-in-place structure. A precast concrete frame structure is one of the most common prefabricated structural systems. The post-pouring joint is important for controlling the seismic performance of the entire precast monolithic frame structure. This paper investigated the joints of a precast prestressed concrete frame structure. A reversed cyclic loading test was carried out on two precast prestressed concrete beam–column joints that were fabricated with two different concrete strengths in the keyway area. This testing was also performed on a cast-in-place reinforced concrete joint for comparison. The phenomena such as joint crack development, yielding, and ultimate damage were observed, and the seismic performance of the proposed precast prestressed concrete joint was determined. The results showed that the precast prestressed concrete joint and the cast-in-place joint had a similar failure mode. The stiffness, bearing capacity, ductility, and energy dissipation were comparable. The hysteresis curves were full and showed that the joints had good energy dissipation. The presence of prestressing tendons limited the development of cracks in the precast beams. The concrete strength of the keyway area had little effect on the seismic performance of the precast prestressed concrete joints. The precast prestressed concrete joints had a seismic performance that was comparable to the equivalent monolithic system.

Dynamic Analysis of Concrete Frame Structure with Story-Adding Steel Structure at the Top

2015 ◽  
Vol 744-746 ◽  
pp. 65-70
Author(s):  
Xiang Hong Sun ◽  
Lie Ping Xie ◽  
Feng Ji
Keyword(s):  
Seismic Performance ◽  
Damping Ratio ◽  
Steel Structure ◽  
Steel Structures ◽  
Frame Structure ◽  
Natural Period ◽  
Concrete Frame ◽  
Finite Element Software ◽  
Original Frame ◽  
Whiplash Effect

After steel structure was added on top of a concrete frame structure, the mass, stiffness, natural period and damping ratio of the original frame structure has changed significantly. Using finite element software ANSYS and software PKPM respectively, model of the original frame structure and the new structure with story-adding steel structure were built. Furthermore, seismic performance of the three structures was studied. Weak location of the structure was found out. Finally, the main factors were analyzed. Results show that whiplash effect is not obvious when one-story steel structure was added on the top of the original frame structure. Also, seismic performance of the frame structure with two-story steel structures on the top is perfect. Some suggestions are put forward for designing the similar structure.

Natural Vibration Period Analysis of Multi-Storey Reinforced Concrete Frame Structure

2012 ◽  
Vol 226-228 ◽  
pp. 351-354
Author(s):  
Li Na Hao ◽  
Yong Sheng Zhang
Keyword(s):  
Reinforced Concrete ◽  
Frame Structure ◽  
Ambient Vibration ◽  
Reinforced Concrete Frame ◽  
Natural Period ◽  
Test Technique ◽  
Infill Walls ◽  
Vibration Period ◽  
Concrete Frame ◽  
Reinforced Concrete Frame Structure

Field measurements of dynamic characteristics of the multi-storey reinforced concrete frame structure buildings were carried out, by using the ambient vibration test technique, and structural modal parameters were extracted. The measured results and calculated results in accordance with current design specifications were compared. Results show that for multi-storey reinforced concrete frame structure, the measured vibration period of structure is close to the natural period calculated in accordance with the empirical formula of the “Load Code for the Design of Building Structures”. In the actual project, when the designer calculate the natural period if considering only the quality of the infill walls, without considering the stiffness of the infill walls, the period should be shortened. In this paper, the recommended period shortening factor for the multi-storey reinforced concrete frame structure is gave 0.4~0.5.

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