In this study, flexural behaviour of the Ferrocement panels of size 500 mm x 500 mm x 50 mm with partial replacement of ceramic powder under monotonic loading is observed. All the Ferrocement panels were casted with cement mortar of mix proportion 1:4 with w/c ratio of 0.45 and all the specimens were casted with single layer of galvanized welded wire mesh of 2mm diameter with mesh opening of 12.5 mm x 12.5 mm. The ceramic powder is administered at various percentage replacement of cement by weight and the adopted variations are 0%, 5%, 10% and 15%. Compressive strength of the mortar mix for all the different ratios of ceramic powder was carried out and the results were discussed. It can be concluded that the Panel with 10% replacement of ceramic powder offers appreciable results than the other panels.
Objectives: To investigate and compare the ductility performance of precast column foundation connection using the method proposed by Park and ASCE 31-03. Methods: Strength and ductility are the most important parameters to resist earthquake forces for the overall safety of a structure. Evaluating ductility from experiments is a cumbersome process. From the experimentally obtained load-displacement envelope, the ductility was evaluated for four specimens of precast column foundation connection by the method proposed by Park and Paulay (1989) and ASCE 31-03. The results were also compared with monolithic specimen. Each of the specimen was subjected to displacement-controlled lateral cyclic loading. The maximum displacement was maintained at 40 mm due to laboratory constraints. Findings: From the evaluated results, ASCE 31-03 gives better values of ductility than the method proposed by Park. The calculated ductility by ASCE 31-03 were 31.5 %, 41.07 %, 72.7%, 68.3% and 48.9 % higher for monolithic specimen, PCBJ, PC I, PC II and GS specimen respectively. Novelty: The present study reveals the best-suited method that can be applied to evaluate ductility for specimen subjected to lateral cyclic loading that has not been reported in earlier studies.
This paper deals with numerical investigation using finite element software, ABAQUS CAE, for the analysis of precast reinforced concrete (RC) column connected to the foundation containing protruding bar in grouted sleeve subjected to axial, and lateral loads, including the cyclic loading response. The monolithic connection of column and foundation is designed and the same has been used for the design of precast concrete column and foundation. The model focusses on the length of the protruding bar provided in the foundation that is connected to the column through the grouted sleeve. As there is lack of Indian standard codes in the design of precast concrete connections, an attempt has been made by varying the length of protruding bars. The model was subjected to quasi-static loading condition and parameters such as ultimate load carrying capacity, load-displacement hysteresis, ductility and plastic strain were studied and were compared with that of monolithic connection. The results proved that when the length of protruding bars provided was equal to development length of the bar provided, the results were comparable with that of monolithic connection.
Background: Generally, Chennai is a hub of traffic congestion, where the major roads of the city are filled with vehicle. It gives the challenging situation to the road and traffic management officials to control and regulate the existing traffic with the existing facilities. Objectives: This paper deals with the microscopic simulation of existing road network model which helps in evaluating the performance of the Thirumangalam road intersection such as delay, queue length and also to evaluate and understand the pedestrian vehicle interaction at the intersection and to propose the improvements of signalized intersection in Thirumangalam at Chennai which is without basic facilities like pedestrian crossing time and it causes heavy congestion during peak hour which makes the management to operate the signals manually. Methods/Findings: PTV VISSIM software is used for evaluation and validation of the road network in order to choose the best alternative and optimization measures before implementation. This study helps to improve the existing junction by suggesting the improvement proposals by referring Indian road congress codes (IRC 106, 86, 103) and it also gives the new optimized signal design which is automated to regulate the traffic.
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