GKGZ type truss seismic steel ball bearing, steel ball bearing seismic grid, designed prices provided by the Engineering Rubber Co., Ltd. Hengshui HaoTong. Hengshui HaoTong Engineering Rubber Co., Ltd. (www.htgcxj.com) Hebei Hengshui, a leader in site construction materials, over the years, the company is implementing scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Hao-engineered rubber leadership with the staff warmly welcome all inquiries negotiations to create Hao-engineered rubber a better future. When the bridge completed and delivered, due to various reasons are not really a bridge maintenance promptly fixed GD seismic grid steel ball bearings, is not complete, the conservation technique emperor, especially for steel truss bridge abutment portion is paid insufficient attention to conservation After years of using checks bearing steel grid can be found awareness seat itself is damaged, the majority of bridges using early Felt like the outside has been replaced, and laminated rubber bearing steel grid appear rubber aging, deterioration, so beam loss of freedom scalability, a direct result of the beam end or pier caps, concrete rupture, causing off angle, gnawing edge phenomenon, steel truss bearing plate displacement will cause serious damage to the deck telescopic device, steel loose bearing fixed grid system, dislocation, cylinder pots exposed parts rust, dust cover rupture. Second, steel truss bearing plate damage tilt fracture, crushed stone concrete support cushions stripped off angle and other diseases. The main cause of damage to the bridge is roughly, one bearing steel grid itself substandard quality, low-intensity, lack of capacity, but in terms of design, bridge bearing selection form, layout unreasonable, bearing edge set aside enough width, steel truss support cushion stone concrete strength is low or insufficient support cushion stone to strengthen steel, fixing bolts. Nuts strong enough, etc. Third, the construction aspect, in terms of installation and construction support cushion stone, beams or pad the bottom surface is not flat stone roof surface is not level, the mortar filling is not dense, inner pad stone embedded steel is not strong, with steel grid Supports connection is not strong, steel bearing corrosion, rust treatment quality is not high. Seismic Design of Highway Bridges Seismic methods GKGZ type truss steel ball bearings, etc. With the fundamental basis fortification standards, and released by your side for 1977 revised highway bridge seismic design specifications WJKGZ type network in the January 1, 1990 Seismic ball bearing steel frame, this time using a range of amendments to be extended to all road works, steel truss seat adjustment may seismic standards, amended soil liquefaction discrimination method, not the soft soil base design of the road base protest regulations; steel truss bearing rubber bearings to increase the use of bridges, the Bay Bridge, the hydrodynamic pressure, soil pressure, steel truss arch bridge abutment connected hole seismic design load calculation formula, the show had a reaction Dean spectral curve, add the part 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.