Fire ranks high among the potential risks faced by most buildings and structures. A full understanding of temperature effects on fiber reinforced concrete is still lacking. This investigation focuses on the study of the residual compressive strength, stress strain behavior and surface cracking of structural polypropylene fiber-reinforced concrete subjected to temperatures up to 300°C. A total of 48 cubes was cast with different fiber dosages and tested under compression after exposing to different temperatures. Concrete cubes with varying macro (structural) fiber dosages were exposed to different temperatures and tested to observe the stress-strain behavior. Digital image correlation, an advanced non-contacting method was used for measuring the strain. Trends in the relative residual strengths with respect to different fiber dosages indicate an improvement up to 15 % in the ultimate compressive strengths at all exposure temperatures. The stress-strain curves show an improvement in post peak behavior with increasing fiber dosage at all exposure temperatures considered in this study.

No abstract

In this analysis, we investigate the role of the location of isolators on the seismic behaviour of an RCC bridge with three different isolator systems. The isolation system in the structure will reduce the external ground motion approaching the structure, so that the structural elements do not behave in a nonlinear fashion, and no damage is caused or cracks develop to structural elements as all the deformations are absorbed by the isolator system. To study the role of isolation location on seismic response, an upcoming five-span RCC village road bridge across a canal crossing in Belgaum district is considered. To analyse the influence of the isolation location on different isolators systems, each isolator was modelled with three different cases: The first model was with isolators at the top of the piers, the second at the middle and the third at the bottom. Three types of isolators, i.e., Lead Rubber Bearing (LRB), High Damping Rubber Bearing (HDRB) and Friction Pendulum System (FPS) were modelled as bilinear link elements. The analysis role of isolation location on modal time period, base shear and displacement of structural elements. The analysis shows that the best location for the isolator to provide full functional benefit is at the bottom of the pier.