Advanced Materials Research Vol. 1096

Abstract: This study investigates the effect of loading rate on Asphalt Concrete (AC) in the laboratory using Three-Point Bending test. As a first step, beam samples were prepared using kneading compactor and final shape of the sample was obtained by laboratory saw. The samples were then subjected to bending loading at different deformation rates at room temperature of 20 °C. The initial stiffness, failure stress (tensile strength) and failure strain were monitored. Results show that the stiffness and the failure stress-strain increase with the increase in loading rate. The findings of the study are expected to be useful to understand the performance of AC due to slow loading such as slow cooling.

Abstract: With the development of civil engineering, the box shaped beam has been widely applied in practical engineering. In general, it is composed of concrete and steel and compared with mechanical analysis, little research has been carried on the back analysis of elastic modulus of box shaped beam. With degraded solid element theory, the shell element is deduced and the displacement function is obtained. The necessary observation revision equation and Kalman regenerative matrix are derived. The stochastic filtering back analysis steps of elastic modulus of the box shaped beam are presented and the analytical procedure is compiled. Through analysis of a classic example, some important conclusions about stochastic filtering back analysis of elastic modulus of box shaped beam are obtained.

Abstract: Due to the superior structure style, orthotropic steel bridge deck has been getting more and more widely practical application. The static and fatigue tests of the orthotropic steel bridge deck models were carried out in this research paper, which presented the fatigue damage developing laws, compared the test results with homogeneous test results in existing documents, and according to the relative fatigue accumulative damage theory, the fatigue accumulative damage equations of the sectional specimen and the whole specimen are respectively studied.

Abstract: Based on LS-DYNA and Lagrange-Euler coupling algorithm, the nonlinear dynamic response of T-steel under external explosive loading of condensed explosives was studied with numerical analysis, and the influence of contact state was mainly discussed. The numerical results showed that the damage effect of steel members under contact explosion was stronger than the non-contact explosion; the axial deformation was the biggest at the center and decreased gradually from the center to surrounding area; under contact explosive, there was a displacement platform at the initial stage of the deformation of the nodes at the farther distance from the center; due to the web, under non-contact explosion, the central tangential deformation was the smallest, and the deformation sharply increased firstly and decreased gradually next from the center to nearby nodes.

Abstract: Abstract This paper presents the effect of random inclusion of palm fibers on strength characteristics of Shanghai cohesive soil. Locally available cohesive soil (CL) is used as medium and palm fibers with three lengths (l = 6, 12 and 18 mm) are used as reinforcement. Soil is compacted with standard Proctor’s maximum density with low percentage of reinforcement (0–1% by weight of oven-dried soil). Direct shear tests, unconfined compression tests and CBR tests were conducted on un-reinforced as well as reinforced soil to investigate the strength characteristics of fiber-reinforced soil. The test results reveal that the inclusion of randomly distributed palm fibers in soil increases peak and residual shear strength, unconfined compressive strength and CBR value of soil. It is noticed that the optimum fiber content for achieving maximum strength is 0.6–0.8% of the weight of oven-dried soil for fiber length 12 mm.