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International Journal of  Civil Engineering and Building Materials (ISSN 2223487X) Vol. 1 No.1 2011 ©2011International ScienceandEngineeringResearchCenter 9 Effects of Mechanical Connectors On The Interface Shear Capacity of Segmental - Concrete Blocks In-filled With Gravel Faisal Hj Ali 1a , Md. Zahidul Islam Bhuiyan 2b and Firas Salman 3c 1 Department of Civil Engineering, National Defence University of Malaysia, 57000 Kuala Lumpur, Malaysia. 2 Department of Civil Engineering, University of Malaya, 50603 Kuala Lumpur. 3 Department of Civil Engineering, University of Malaya, 50603 Kuala Lumpur. a [email protected], b [email protected], c [email protected] Keywords: segmental block, interface shear, mechanical connector, retaining wall. Abstract : Among the facing systems of the mechanically stabilized earth (MSE) retaining walls, segmental retaining walls (SRWs) also called modular concrete block walls are in a  period of enormous growth at the present time . From the past research works it is found that facing instability basically occurs due to poor connection strength and inadequate connection systems. In the pr esent study, mechanical shear connectors are used to f ind out their effects on the connection shear capacity of newly designed and fabricated precast "I" blocks. A series of tests are carried out using a specially designed & fabricated direct shear apparatus to assess the  behavior of the connection systems under different normal loading conditions. Test results reveal that the presence of connectors influence the interface shear capacity depending on the nature of the connectors i.e. rigid or flexible. Introduction . Geosynthetic reinforced segmental retaining walls (GR-SRWs) consisting of polymeric reinforcements and precast modular block units have achieved popularity worldwide in the last three decades because of their many fold advantages. They are frequently used in many geotechnical applications. Today, facing stability is an important issue in the current design guidelines. Past research works [1][2][3][4][5][6][7][8] reported that facing instability  basically occurs due to poor connection strength and inadequate connection systems. Fig.1 Interface shear failure of a segmental Fig. 2:An example of pin/dowel shear connector Retaining wall (SRW) One of the mechanisms of facing instability that needs a special attention by the engineer is the interface shear failure as shown in Fig. 1. Mechanical connectors are mainly used to help out unit alignment and control the wall facing batter. Bathurst and Simac [2] reported that shear connectors (mechanical) or shear keys provide additional interface shear capacity of segmental concrete units.

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Page 1: Effects of Mechanical Connectors on the Interface Shear Capacity of Segmental - Concrete Blocks in-Filled With Gravel

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