jgj145-20xx混凝土结构后锚固技术规程英文版

jgj145-20xx混凝土结构后锚固技术规程英文版内容摘要：

e edge of the concrete member on the shear resistance. ec,N, ec,v = factor take account of a group effect when different tension (shear) load are acting on the individual anchors of a group. h,v =factor take account of the fact that the shear resistance does not decrease proportionally to the member thickness. re,N =the shell spalling factor takes account of the effect of dense reinforcement. s,N ,s,v = the factor takes account of the disturbance of the distribution of stresses in concrete due to edge of the concrete member on tension (shear) resistance. ucr,N, ucr,v = the factor takes account of the position effect of the anchorage in cracked or noncracked concrete on tension (shear) resistance. – 15 – 3 Materials of concrete and anchor elements Concrete base materials The concrete base material shall be solid and sufficiently large to resist and the intended loads. Excessively air voided concrete, grout, grout layer and decorative mortar layers may not be considered as sufficient base material. Concrete strength for base material of postinstalled fasteners shall be at least C20. The concrete strength and modulus of elasticity should be obtained by onsite testing according to Code for Design of Concrete structures— GB50010. Anchor elements The materials of steel anchor elements shall be carbon steel, stainless steel or alloy steel. The selection of the anchor element shall be based on the environment condition and durability requirement of the application. The performance of anchors should ply with Expansion and undercut building anchors for use in concrete The materials performance of anchor made of carbon steel or alloy steel shall be defined by stkf and stkykff (see Table ). Table The material performance of carbon/alloy steel performance grade Characteristic tension strength stkf (MPa) 300 400 500 600 800 Characteristic yield strength ykfor ksof 2, (MPa) 180 240 320 300 400 480 640 Extension ratio 5 (%) 25 22 14 20 10 8 12 Note: the performance grade means 300stkf (MPa), stkyk ff。 The performance grade of anchor made of stainless steel shall be defined by stkf and ykf (see Table ). Table The material performance of stainless steel (austenitic A1, A2, A3) performance grade diameter of thread rod (mm) Characteristic tension strength stkf (MPa) Characteristic yield strength stkf (MPa) Extension ratio 5 50 39 500 210 70 24 700 450 80 24 800 600 Note: the extension ratio  is achieved from criteria The rebar and threaded rod of bonded anchors should be HRB 400 or HRB 335 – 16 – steel ribbed rebar and Q235 or Q345 steel threaded rod. The performance of ribbed rebar shall ply with Code for Design of Concrete structures— GB50010. Elastic modulus of anchors: Es=105Mpa. Adhesive material of adhesive anchoring systems The anchorage performance of the adhesive material of adhesive anchoring systems shall be determined by special tests. Any extra filler and /or additives are forbidden to mix with an authorized bonding material on site except the mitted dose filler and /or additives described in Manufacturer’s instruction. Each type of adhesive material, including capsule package, injection cartridge and bulk with mechanical proportioning on site, should be used according to its performance and conditions on site. The performance of epoxy bonding material should ply with the requirement in Table The performance of adhesive with ponent of epoxy No. Performance Testing method Mechanical performance Viscosity strength (25℃)=4500～ 75000 Normal cure is available under the installation temperature 5℃～ 40℃, and the curing time can viscosity strength test method GB279481 Thread rod Thread rod Thread rod Component 1 Component 2 b) packed injection c) Bulk mixed on site a) capsule adhesive Fig. the types of adhesive – 17 – be changed by changing the ponent proportion. Strength and flexibility of bonding material Characteristic pression strength fbc,k≥60N/mm2 Characteristic tension strength fbt,k≥18 N/mm2 Elastic modulus E≥103 N/mm2 Ultimate deformation εu ≥ Compression Test method for plastic material GB104179 Tension Test method for plastic material GB104079 Steelsteel bonding strength Characteristic shear strength fbv,k≥14 N/mm2 Characteristic tension strength fbt,k≥20 N/mm2 Characteristic slit strength fbp,k≥20 kN/m Test method for shear strength of bonding material under tensile load GB712486 Test method for tension strength of bonding material GB632986 Test method for slit strength of bonding material bonded metal to metal HB5166 Steelconcrete bonding strength The bonding failure should occur in concrete instead of in bonding material Two steel plate(50505) with a steel rod respectively, axes symmetrically bonded on the bigger surface of a C50 concrete cube (707050). Tested under tension load after the curing time. Temperature influence on characteristic resistance fbv,k≥14MPa under transient temperature at the surface of the concrete within the range 45℃～ 80℃ and steady temperature within the range 35℃～ 60℃. GB 712486 Freeze/thaw influence on characteristic resistance fbv,k≥14MPa under 50 cycles within the temperature range 25℃～ 25℃. GB 712486 durability fbv,k≥14MPa, Lab aging test: ≥3000h. GB 712486, color and colorless paint — lab weathered aging and radioactive exposure — tritium arc radiation – 18 – 4 General design principles Identification and application principal Types of anchor can be divided into expansion, undercut, adhesive, rebar and other types of fa。