[Grid] seat in the actual project often increases the elastic support rubber pad in the top beam or capitals, especially in large-span truss, the seat by rubber advances to meet the requirements of the temperature stress of the deformation, which requires beam or column consider the elastic stiffness and rigidity of the superposition of the elastic rubber pad, when the K1 and K2 overlay, superimposed by the displacement superimposed lent stiffness K is: 1 / K = 1 / K1 + 1 / K2; there is K = 1 / (1 / K1 + 1 / K2). [Grid holder] (JOINTS) elastic support to produce the corresponding displacement ratio, reaction force and displacement at the same time provide a reaction force remain unchanged, called stiffness elastic support. Elastic support can provide mobile constraints, but also provides a rotational constraint. When bearing stiffness and rigidity similar structure, it should be simplified as an elastic support. When a part of the structure to withstand loads (eg Structural stability), which can be regarded as an adjacent portion of the elastic support portion, bearing stiffness depends on the stiffness of the adjacent part (such as the cable-stayed bridge cable-stayed simplified as spring brackets). When bearing stiffness is much greater than or much smaller than the rigidity of the portion of the elastic support is ideal seat forward four transformation. [Grid] bearing grid (net shell) structure is generally supported on the ring beam and other capitals or lower support structure, referring JOINTS grid nodes located on the support structure. It is connected to the grid to the support of the Concurrent rod members, but also to support the entire truss steel truss mount finished welcome to consult, and the role of grid (net shell) on the load transfer to the lower support structure. Therefore, bearing node is the link truss structure with the lower supporting structure linked, but also the entire structure of an important part. [Grid] a reasonable bearing JOINTS force must be clear, transfer simple, safe, reliable, simple and reasonable structure should also be done, making simple and convenient, has a good economy. [Grid bearing grid bearing] [] define the definition and bearing structure and support as possible in line with the general to mount a cross-sectional calculated minimum fixed with an elastic support, followed by bigger and more close to the fixed spring stiffness, [net rack mount] conservative approach than the actual spring rate calculated by taking a little smaller, the smaller the security (generally independent pillars are elastic support, that is, to the top of the column is applied to a horizontal force, most top level post direction is elastic, it is impossible that does not move, the spring stiffness coefficient generally take 0.3-3, even if calculated bigger than 3 GB finished truss bearing trust preferred, also take a smaller take three, so that not every design Spring stiffness has taken 0.3 software, the default grid Sichuan domestic bearing manufacturers selling, you want to count, the Internet also has a small spring rate calculation software, SFCAD2004 version also has a function to calculate spring rate, MST toolbox also have this function, fixed What do you mean, plainly, is to exert a level of force, not moving a little bit, when set on the ground bearing concrete, we can X, Y, Z direction are set fixed,) calculated with freedom section max, this is generally not. 4 \ selection of materials and design strength, slenderness ratio of truss supports, [grid] option is bolt-bearing solder balls or standard design strength of steel is 215N / mm2, we generally controlled within the standard value 0.9, 215 * 0.9 = 193.5N / mm2, this SFCAD default 200 N / mm2, MST default 193.5 N / mm2, we designed this value can also be changed to 190,185,180, generally not too large projects and complex projects modeling simple discontinuity 200 will default on the line, large span and complex modeling complex stress, you have to change 190,185,180, mainly to improve its safety grid support seat, steel truss bearing finished welcome to consult, Guangrun Rubber Company by-Engineering Rubber Co., Ltd. Hengshui. Hengshui-Engineering Rubber Co., Ltd. (www.grgcxj.cn) (www.grgcxj.cn) is specialized in "earthquake spherical steel bearing, one-way two-way sliding spherical steel bearings, ball joints fixed elastic damping bearings," the enterprises, companies adhering to the "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Mr. Wang.