Changsha Huanghua Airport Runway Overlay of Asphalt Concrete Mixture Optimization
SMA asphalt mixture is the old airport pavement overlay of asphalt concrete most commonly used technical solutions, combined with the previous runway coagulation Concrete Asphalt design, from the perspective of Asphalt Mixture Design. Laboratory produced using different asphalt modifier, additives (fiber, anti-rutting agent) to form several SMA asphalt mixture. Laboratory tests are to be determined each program's conventional indicators, such as pavement rutting performance. Analysis of test results, the final mixture is to be determined the optimal program. The results showed that SBS star relative linear modifier better road performance, the selection of PAN fiber than the lignin additive mixture of additives on the adhesion, crack resistance, resistance to water damaging have a larger increase, which for the SMA in the application of the runway asphalt concrete pavement to provide a basis for improvement.
Evaluation of Recycled Projects for Performance
iii IMPLEMENTATION STATEMENT iv LIST OF TABLES vi LIST OF FIGURES vi
Evaluation of buckling load and dynamic performance of steel shear wall retrofitted with strips made of shape memory alloy
One of the most imperfections of the steel shear wall is out of plane displacements that cause severe damage in both structural and non-structural elements. In this paper, the effects of shape-memory alloys on steel shear walls are investigated. First, a numerical analysis using the finite element method in ABAQUS software has been carried out according to an experimental test. The results of the numerical analysis have been verified with experimental results. Next, shape-memory alloy fibers have been added vertically and horizontally to various parts of the steel shear wall. The results show that retrofitting with the shape-memory alloy reduces the out-of-plane displacement of the steel shear wall under both cyclic and seismic loadings. Besides, the buckling load in the steel shear wall increases when it is retrofitted with the shape-memory alloy. Also, the total out-of-plane movement (accumulated absolute displacements) of the steel shear wall and non-structural damage are controlled by the characteristic of a shape-memory alloy material called “super-elastic”.