The maintenance aspect, the sliding surface, rolling surface is not flat, dirty, dust and other foreign matter not timely cleaning, fasteners loose reinforcement is not timely, because waterproof device defect makes the holder or link area water corrosion, accelerated aging processes. Again is due to the piers, abutments uneven subsidence, tilt and horizontal shift of the upper structure, vibration displacement and other superstructure steel truss bearing directly affect the normal use. Bearing steel grid can make safe and effective use of normal, it should strengthen the holder of regular inspection and repair and reinforcement work, and dedicated to the steel truss seat for the daily management and maintenance purposes, put into practice style is very difficult, it is usually combined with other conservation work with bridge steel truss seat and pay attention to the site and check its own integrity, observing the presence or absence of dislocation, void, bearing activities are flexible, fixed bearing is moved Sliding Bearings seismic grid position, the amount of displacement is normal, fixed connection is intact, supporting cushion crushed stone concrete for cracks, dust deposition and rubber bearings is aging cracking, deformation is uniform unidirectional sliding support grid seat, steel truss bearing steel pots grid Sliding Bearings, ball bearings with or without the appearance of rust dust cover is intact and so change phenomenon. China's highway bridge seismic design methods, standards, etc. With the fundamental basis for fortification, and published in the January 1, 1990 through to the 1977 revision of your highway bridge seismic design specifications, this revision of the scope extended to all road engineering, steel truss seat adjustment may seismic standards, amended soil liquefaction discrimination method, not the soft soil base to fight the road base design requirements; increased use of bearing steel truss bridge rubber bearings, Bay bridge, directional grid slip hydrodynamic pressure bearing, ground-breaking pressure, steel truss arch bridge abutment connected hole seismic design load calculation formula, show Dean had a response spectrum curve, add a portion of the tunnel seismic. Revised and increased the relevant provisions of the seismic measures, while, in the structure theory switch to partial coefficient expression limit state issued, compared with the 1977 specification, steel truss support may say in the design theory and design methods as well as in the content have made a larger patches and additions. However, some of our roads and bridges engineering and seismic design study more advanced countries other domestic industries and the world, steel truss bearing on the application of seismic design, failure criteria and damping measures there is a big gap. Seismic Design application below. Directional grid slip bearing, sliding bearings, Taizhou grid, finished by a professional manufacturer Hengshui HaoTong Engineering Rubber Company. Hengshui HaoTong Engineering Rubber Co., Ltd. (www.htgcxj.com) strong, credible, Hebei Hengshui site construction materials industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement through innovative ideas will lead Hao engineered rubber and you work into the brilliant, for a better future!