Restriction Effect of Structural Steel to Ultra High Strength Concrete in the Joint Core Area

In this paper, ANSYS finite element analysis software is used to research the restriction effect of steel skeleton to the joint core regions of ultra high strength concrete. The position of concrete crack is given and the crack development trend is explained. The study found the maximum stress position appears at the beam-column joints, and reaches the maximum in the web of “I” shape structural steel.

A Study on Practical Design in Joint Core Area of Concrete Beam

This paper makes a comparison between computer and hand computation of joint core area according to an example of typical engineering. Firstly, author summarized the common problems and erroneous judgments which are likely to happen in the software calculation of joint core in engineering design, and then analyzed the causes to these problems, and provided hand calculation solutions to related problems according to standard formulas. Author analyzed and proved that the reinforcement calculation of joint core area for frame structure calculation is not only necessary, but also can conveniently solve the coordination problems in the related terms of “Concrete Structure Design Norm”, “Earthquake Resistant Design Code” and “Concrete Structure Engineering Operation Standard”, and is also the supplement for the uncovered parts of computer calculation.

Analysis of the Impact of Concrete Compressive Strength Reduction in Joint Core Area on Super High-Rise Structures

t is focused on a super high-rise building structure, of which the concrete compressive strength is reduced in joint core. The whole structure is calculated with program SATWE. Based on this calculation, integral stress analysis by MIDAS when concrete strength is reduced in joint core area and nonlinear finite element analysis by ANSYS on the joints of the worst cross-sections in the whole structure are developed. Thus the adverse effect of reduced concrete strength in joint core area on super high-rise structures is found out.

The Seismic Behavior of High-Strength Concrete Frame Joints

By studying the two high-strength concrete frame joints by means of experimental investigate and finite element analysis with the low cycle reversed loading method, it discussed the influence of the steel fiber on the seismic behavior of the high-strength frame joints. The result shows that, mixed with steel fiber can enhance the constraint of the concrete at the joint core area, improve the seismic behavior. Amount of steel fiber can replace part of the stirrup.

Study on Effect of FRP Reinforced Manners on Seismic Performance of Concrete Frame Structure

Many studies showed that FRP bonded to the concrete beams and column surface can effectively enhance the mechanical properties of members, and FRP reasonably bonded to the beam-column joint area can significantly improve the seismic performance, but not enough studies have been carried out on the overall mechanical properties in structure after the framework members are partially covered with FRP. In this Paper, based on the seismic demand analysis of the concrete frame structure, as well as FRP seismic enforcement strategy, a fiber attachment method has been proposed for FRP seismic reinforcement framework. Taking a two-layer dual-span plane framework as an example, nonlinear static analysis has been carried out on FRP-reinforced framework, the capacity spectrum method has been adopted to assess the seismic performance of reinforced framework and the impact of different FRP-reinforced methods on structural seismic performance has been discussed. The results showed that the method of moderate shear-resistance reinforcement in the joint core area, as well as the beam-column plastic hinge area, can effectively improve the seismic performance of the framework, the application of GFRP reinforcement features higher cost-performance ratio, and the FRP bonding at ± 45º in the joint core area can better the reinforcement effect.