不同縱筋率對剪跨比為2.5的無腹筋約束梁受剪性能影響的研究

1、重慶大學(xué)碩士學(xué)位論文不同縱筋率對剪跨比為2.5的無腹筋約束梁受剪性能影響的研究姓名：楊恩建申請學(xué)位級別：碩士專業(yè)：結(jié)構(gòu)工程指導(dǎo)教師：李立仁20050501英文摘要IIIABSTRACTFor the reinforced concrete bend members, many factors can influence the shear strength ofoblique section, furthermore the destr

2、oy mechanism is complicated, so the shear strength of obliquesection is one of the unfathomed problems of reinforced concrete structure. The design codes ofmany countries exert statistical method, advance different formu

3、la, based on previous experimentresults and research. Many countries base their design codes on the previous experiment results andresearches, and establish different formulas using statistical method. But in general, to

4、 ensure thefinal shear failure, a very large longitudinal reinforcement ratio, usually larger than 2.8%, waschosen as a prerequisite in previous studies on shear behavior of reinforced concrete beams. It isvery different

5、 from that in practice under such circumstances the longitudinal reinforcement ratio isamong 1.0~1.5%. The codified design equations based on such testing data may be produce an error.This paper is a part of series of ex

6、perimental study. Eight restrained beams without webreinforcements and different longitudinal reinforcement ratio were tested under static point loads,with the shear- span ratio being kept around 2.5. On this basis, the

7、overall process of crackingdevelopment under shear and the effect of longitudinal reinforcement ratio on it was investigated.FengHong, the master of Liliren professor, has studied the effect of different longitudinalrein

8、forcement ratio on shear behavior of restrained beams without web reinforcement whenshear- span ratio is 1.5, so in this test, except the shear- span is 2.5, other parameters are the same asFenghong’ s test. In this pape

9、r, on the basis of the two tests results, through comparing and analyzing,find some disciplinarian of effect of different shear- span ratio on shear behavior of restrained beamswithout reinforcement. In this paper, on th

10、e basis of the two tests results and through comparing andanalyzing, we hope to find some disciplinarian of effect of different shear- span ratio on shearbehavior of restrained beams without web reinforcement.In this exp

11、eriment, the monotonic static load experiment was studied, and the extending anddevelopment of cracks、strains of the longitudinal reinforcements and deflection of the beams arecarefully recorded, the correlation between

12、the change of the strain of the reinforcements and thedevelopment of cracks of each experimented member was tried to keep track of, and by this way wehope to find out the general law of the crack development and the rein

13、forcement stress distribution.Another, by comparison of the extending and development of cracks、 final failure mode and ultimatecapacity of members of different longitudinal reinforcement ratios we unveiled the law of ef