How to Determine the Anchorage Depth of Exterior Wall GRC Components? Structural Safety and Qinglong Group's Anchorage Calculation Criteria

The anchorage depth of exterior wall GRC components is the fundamental guarantee for ensuring their reliable connection to the main structure and for resisting wind loads, seismic action, and self-weight. It must be determined through rigorous calculation; estimation based on experience is strictly prohibited. Qinglong Group's anchorage design follows the principle of "calculation first, detailing as supplement, experimental verification". The calculation of anchorage depth mainly depends on the anchor type, the strength of the GRC substrate, and the loads to be resisted (tension and shear).

According to the technical specification for post-installed anchoring, the anchorage depth hef in a concrete substrate must satisfy: hef ≥ max(hef,N, hef,V). Here, hef,N is the anchorage depth required for tension, and hef,V is the anchorage depth required for shear; the detailed calculation involves formulas for multiple failure modes such as concrete cone failure and splitting failure. For GRC, a composite material, the substrate strength (compressive and tensile) is a key input parameter for the calculation. Qinglong Group strictly controls GRC strength during production and provides strength test reports for each batch of products, supplying an accurate basis for anchorage design. Generally, in GRC with strength above C30, the anchorage depth of a single M10 undercut anchor should not be less than 60mm.

Beyond calculation, detailing requirements are equally important. The edge distance and spacing of anchors must meet the minimum values specified in the standards to prevent edge splitting failure. For thin panels (e.g., thickness less than 100mm), through-type anchorage or specially designed back bolts must be used. Before construction on every project, Qinglong Group conducts on-site pull-out tests to verify whether the actual load-bearing capacity of the anchorage system reaches the design value. In the typhoon-prone areas of Hainan, we even appropriately raise the safety factor and increase the number of anchors. During the installation of the complex double-curved panels at the Wuhan Han Show Theatre, we calculated and arranged anchors individually for each shaped panel according to its load-bearing characteristics, ensuring absolute safety under strong winds and complex loading. Scientific anchorage is the "root" that keeps GRC curtain walls standing firm.