1 General Provisions
1.0.1 In order to promote the rational application of technic of post-anchorage used in concrete structure engineering with inorganic anchoring material, to achieve advanced technology, safety and applicability, economic rationality, and to ensure quality, this specification is formulated.
1.0.2 This specification is applicable to the design, construction and acceptance for the post-anchoring used in reinforced concrete, pre-stressed concrete and plain concrete structures with inorganic anchoring material, but not applicable to that used in lightweight aggregate concrete and special concrete structures.
1.0.3 The seismic fortification intensity of concrete structures anchored with inorganic materials shall not be greater than 8 degrees (0.2g) and shall not directly bear the repeated effects of dynamic loads.
1.0.4 In addition to the requirements of this specification, the technic of post-anchorage used in concrete structure with inorganic anchoring material shall also comply with national current relevant standards. ?
2 Terms and Symbols
2.1 Terms
2.1.1 Inorganic anchorage adhesive
An anchorage adhesive which is mainly made of inorganic binding material and added with the filler and other additives, which is referred to as “the inorganic adhesive”.
2.1.2 Anchorage bars
The plain or ribbed bars used in post-anchorage engineering.
2.1.3 Technic of post-anchorage used in concrete structure with inorganic anchoring material
A technic that enables to effectively anchor the anchorage bar into an existing concrete structure with an inorganic adhesive.
2.1.4 Base
A concrete structure or member for anchoring anchorage bars and bearing the transfer of anchorage bars.
2.1.5 Anchorage capacity test
An on-site test that an axial pull load is applied along the axis of the anchorage bars for testing the anchoring performance. The anchorage capacity test can be classified into destructive test and non-destructive test.
2.1.6 Drilling hole
The hole that is constructed for arrangement of anchorage bars during anchoring engineering.
2.2 Symbols
B - he size of the base along the anchoring direction;
D - the diameter of the drilling hole;
d - the diameter of the anchorage bar;
d1 - the diameter of the mechanical anchorage pier head;
fbd,1 - the design value of the bonding strength between the anchorage bar and the inorganic adhesive;
fbd,2 - the design value of the bonding strength between the inorganic adhesive and the concrete base;
fs - the design value of strength of the anchorage bar in anchoring section in the ultimate limit state;
h - the length of the mechanical anchorage pier head;
lds - the design value of the anchoring depth;
ls - the calculated value of the anchoring depth;
ls,1 - the calculated value of the anchoring depth between the anchorage bar and the inorganic adhesive;
ls,2 - the calculated value of the anchoring depth between the inorganic adhesive and the base;
Ns - the design value of the tensile load-carrying capacity of the anchorage bar;
N0 - the measured value of the ultimate anchorage capacity of the anchorage bar;
αspt - the calculation factor referred for preventing the concrete from splitting;
γ1 - the importance factor of the post-anchorage connection;
η - the reduction factor of anchor group effect;
ξ - the mechanical anchorage factor of ribbed bar;
σs - the calculation value of stress of the anchorage bar used in the calculation of the post-anchoring depth;
ψae - the correction factor in consideration of the displacement ductility requirements of bonded bars;
ψN - the correction factor in consideration of the impact of the stress state of the structural members on the tensile capacity of the anchorage bar.
