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Technical reference

Calculation of allowed loads on a bearing length

HIT connectors are balcony connectors which allow:

  • Effective thermal insulation of the balcony slab to guarantee a high level of interior comfort
  • Maximum demands on the fire protection
  • Simple and efficient installation for to ensure construction deadlines are met
  • HALFEN HIT Insulated Connection are the perfect solution to achieve the highest standards of quality. Two product lines are already available:
  • HIT-HP High Performance with an insulation thickness of 80mm
  • HIT-SP Superior Performance with an insulation thickness of 120mm
  • The product portfolio of HIT Insulated Connections has been expanded by two new product groups: Beam and wall connections. These elements are used as thermal breaks between two reinforced concrete components.

You can find all the technical details for how HIT connectors are used if you download the HIT catalogue

Defining a bearing length

The calculation API at POST to ./api/v1/calculation/connectors-for-load/ returns HIT connectors that satisfy a given problem on a single bearing length. If multiple bearing lengths are needed on a single balcony, they need to be posted to the API as multiple requests. Main parameters that define the problem on a bearing length are:

  • selector -- what type of HIT element is needed
  • ultimate_loads -- the loads on a connector
  • length -- length of the bearing in meters
  • concrete_class_structure and concrete_class_balcony -- concrete classes on both sides, e.g. C25/30
  • positioning_algorithm
  • can be either endless where connectors are cut to length and the combined length of the connectors will be equal to the full length of the bearing or
  • halfen_custom_fit where connectors of (possibly different) lenghts are combined to come as close as possible to the full length of the bearing
  • optimization_objective -- by which criterion to select the optimal connector in the list of valid connectors for a given problem. Can be price, thermal or utilization.

What kind of loads are expected by the API

The API wil handle only ultimate loads. That means that all the loads need to already be multiplied by all the safety factors and combined into one envelope (highest possible loads and lowest possible loads) for moments and one envelope for shear forces.

Units

All the units are given in SI. Typically that means that distances are in meters, distributed shear forces in N/m and distributed moments in Nm/m. Consult the API specification for details.

Calculation request and response contents

Generally speking, the request will consist of shear loads and moments at different points (can be arbitrarily and non-uniformly spaced) along the bearing length.

Request contents

In the reponse of the API, the connectors will be returned which can bear the necessary loads -- the load capacity is equal or higher than the extreme loads.

Response contents