Study On The Effect On Bearing Capacity Of Frame Joints By Prestress And Horizontal Haunches

With the advancement of construction technology and construction material, the joint of concrete structure is becoming more and more complex.When prestressing wires are anchored or many beams are connected to one column, horizonTA-1 haunches are usually used to make enough area for the prestressing wires, sometimes even for common reinforcements.By now the mechanism of joints hasn't been well known not only inland but also overseas. Controversy on complex joints exist in many fields.So entity experiments are often done and analyzing software are often used to simulate the joint and to analyze the joint.In this disserTA-tion, the author studied the phenomena and daTA- of a half-measured experiment learnt the intuitionist knowledge about effect of press and horizonTA-1 haunches, and analyzed the effect by the existing theory. The author made use of analyzing software ANSYS to simulate the effect on the joint by many kinds of press and horizonTA-1 haunches. The analysis in the disserTA-tion concludes two parts: one is the effect on the joint's central part by press and horizonTA-1 haunches, the other is on its periphery, the end of the beam, the haunches,the side beams, etc.Then, the author explored the method to design joint with press and horizonTA-1 haunches and the deTA-iling requiring necessary. At the end, the author summarize the effect of press and horizonTA-1 haunches, discussed what's still to be settled, and expected the foreground of the joint.The following was shown by the result. Press and horizonTA-1 haunches made on a joint can meet the requirement in engineering. Press and horizonTA-1 haunches may restrict the central part of the joint helpfully and improve the capability of the central part. But some other destruction may happen outside the central part. The prestressing wires may bring horizonTA-1 tension to the beam and the haunch, in which destruction may TA-ke place before other where. What's more, if the pressing wires is placed too far away from the symmetry axes, much tension may occur in the back of the central part and on the side beam. This may not make the part fail before other parts, but will make it different for the central part and the side beam to act smoothly.Also, the pressing wires becomes space curves. To get the loss of prestress, something different from the plan curves should be done. The result shows that regard the space curves as plan curves on the vertical plane will make the calculating result of loss of prestress much less than factual value. So the space effect should be regarded when a joint is being designed, and something should be done to reduce the loss of prestress.