Requirements and test methods of strength for the superstructure of bus
1 Scope
This standard specifies the technical requirements and test methods of strength for the superstructure of bus.
This standard is applicable to Classes B, II and III buses and special school buses of Categories M2 and M3, and may be referenced by other buses of Categories M2 and M3.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 11551 The protection of the occupant in the event of a frontal collision for passenger car
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
group of vehicle types
those vehicle types, proposed in future as well as existing now, which are covered by the approval of the worst case, in respect of this standard
3.2
worst case
vehicle type, among a group of vehicle types, least likely to withstand the requirements of this standard in respect of the strength of superstructure. The three parameters which define the worst case are: structural strength, reference energy and the residual space
3.3
double-deck bus
vehicle with at least a part of passenger space arranged on upper and lower decks and no standing passenger space on the upper deck
3.4
passenger compartment
space intended for passengers' use excluding any space occupied by fixed appliances such as bars, kitchenettes or toilets
Note: It is revised from Definition 3.22 in GB/T 4780-2000.
3.5
occupant restraint
any device which connects a passenger, driver or crew member to his seat and reduces their injuries by limiting the movement of the wearer's body during a rollover
3.6
vertical longitudinal central plane
VLCP
vertical plane which passes through the mid-points of the front axle track and the rear axle track
3.7
residual space
space to be preserved in the passengers', driver's compartment(s) and separate compartment to provide better survival possibility for passengers, driver and crew in case of a rollover accident
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements and test methods
5 Judgment of the same type
6 Requirements for the standard implementation transition period
Annex A (Informative) Comparison between this standard and ECE R66 in clause/subclause number
Annex B (Informative) Technical deviations, together with their justifications, between this standard and ECE R66
Annex C (Nominative) Basic test method - Rollover test on a complete vehicle
Annex D (Normative) Technical documentation required for type approval test
Annex E (Normative) Body section rollover test as an equivalent test method I
Annex F (Normative) Quasi-static loading test of body sections as an equivalent test method II
Annex G (Normative) Quasi-static calculation based on testing of parts as an equivalent test method III
Annex H (Normative) Computer simulation of rollover test on a complete vehicle as an equivalent test method IV
Annex I (Normative) Measurement of the centre of gravity of the vehicle
Annex J (Normative) Viewpoints on the structural description of the superstructure
Bibliography
