Expansion Joints Issues and Concepts PowerPoint Presentation

Expansion Joints Issues and Concepts - PowerPoint Presentation ExampleSome structures would not support ground movements such as earthquakes leading to destruction of buildings and bridge circuits. This led to the idea of enlargement formulates that would later solve the problem (Rosignoli, 2002). Functions of expansion marijuana cig arettes The primary(prenominal) function of expansion joints is to safely absorb the high temperatures of various construction materials as a resolvent of the constant expansion and contraction. As explained earlier the contraction and expansion is collectible to the changing weather conditions (Brown, 2001). The expansion joints therefore make structures to remain intact thereby they become safe for public use. There be many types of expansion joints and each is designed to solve a specific problem though the plan or function still comes back to absorbing stress to avoid damage. Types of Expansion joints employ in bridges in Australia connect expansion joints argon joints that are designed to allow traffic to put over the bridge structure while at the same time permitting the movement of the bridge deck due to thermal effects, wind, traffic loading, seismic effects among others. The joints should provide a watertight connection for the lifetime of the bridge as the lack of it could reduce the durability of the main bridge structure that may result in the need for major remedial works. These kinds of joints are rather unique because of their relatively delicate construction and concentrated loading conditions and therefore need to be re dictated several times during the life time of the bridge (Gottermoeller, 2004). Bridge expansion joints bay window be broadly classified into two types absolved joints and closed joints. The open joints are not water proof. Water and debris are allowed to fall through the joints. The water erodes the soil down the stairs the structure, strains the bent cap and columns, is detriment al to adjacent steel girders, diaphragms, bearings and is a nuisance to any traffic low the structure. The closed joints on the other hand are water proof and have become an selection to open joints due to the many advantages that they provide (Blockley, 2010). There are three most common types of open joints used in Australia. The butt joints provide an open space between adjacent edges of the deck. They are used where the movements are of a rotational nature or where the thermal movements are small. The edges are usually protected with metallic armor which is subject to corrosion (Lima, 2006). The open space frequently fills with debris making the joint less effective. Period maintenance is mandatory to clear up the joint and the debris. The second type is the place joint which accommodate greater movements than the butt joints, usually between one and three inches. A sealer is placed in the joint that prevents some water from passing through. It also prevents the accumulatio n of debris that can make the joint ineffective. The third type of joint is the tooth joint or the finger joint (Gottermoeller, 2004). They are usually used on long bridges to accommodate large movements. They are usually placed in the span near the point of contra flexure. Drains are placed to prevent drainage across the joint if feasible. In some areas they are provided with a drainage system to collect the water passing through. These joints are used where water and debris passing through cannot damage anything below the bridge. The performance of these joints