Experimental study on effect of slot on bridge pier structures

Since, complete protection against local scour around bridge pier are not economical, the designer must seek ways to steer and control scour and reduce scour potential of structural damage. Usually two basic methods to protect against scour are presented. In the first way, that called direct method resistance of river bed is added against stresses. In the indirect way, second method, the flow regime has changed and horse shoe and vortexes which created around bridge pier are wreaked and reduce its intensity. One of the cases of the 2nd way is using the slot in the pier .The research has shown that this slot which construct in the pier can reduce depth of scour hole about 20%. But the slot, causes reduce the strength of pier structure under applied load up to 55% strength of control model. In this research seek a way for solving the problem. After carryout many tests found that when used the rectangular tie in section of slot, pier gain the strength about 86.4% of control model. Therefore, approximately comport 310.98kg/cm2.