Article 1.0.1 This regulation is applicable to the design of deck type composite beam, which is the combination of 1435mm standard gauge railway steel plate beam and reinforced concrete plate in national railway network through coupler to bear load together.
Article 1.0.2 During the design of composite beam, it shall not only meet the requirements in this regulation, but also be implemented according to the relevant requirements of "Code for design of Railway Bridge and Culvert" (TB J2-85) (hereinafter referred to as "Bridge Code").
Article 1.0.3 Unless otherwise specified in this regulation, the load adopted for the design of composite beam shall be implemented in accordance with the requirements in Chapter III of "Bridge Code".
Article 1.0.4 The vertical deflection caused by static live load (impact force is ignored) shall not exceed 1/800 of the span.
The camber of composite beam shall be preset; however, where the total deflection generated by dead load and static live load does not exceed 1/1600 of the span, it may not be set.
The camber curve shall almost be the same with the deflection curve generated by dead load and half a static live load, but shall be opposite in direction. Where the setting of camber cannot be realized by adjusting the ballast height separately, the camber may be set on the steel beam wholly or partially.
Article 1.0.5 Under the most unfavorable combined action of calculated load, the coefficient of horizontal overturn stability of beam shall not be less than 1.3.
Article 1.0.6 The composite beam shall be able to be jacked up with lifting jack, the jacking device and the structure itself shall be checked and calculated according to 30% overloading of jacking-up load.
Article 1.0.7 The internal force generated by the influence of temperature change shall be counted for composite beam, it shall be calculated according to the difference of actual temperature change between steel beam and reinforced concrete plate; where sufficient technical data is unavailable, the temperature in the beam and the plate may be regarded as a certain value within the respective height range and its difference may be ±15℃.
Article 1.0.8 Basic steel materials and welding materials adopted for composite beam shall meet the requirements of Section II in Chapter IV of "Bridge Code". The allowable stress and improvement coefficient shall meet the requirements of Section III in Chapter IV of "Bridge Code", however, the allowable stress and improvement coefficient of steel beam may be 1.15 under the combined action of main force and temperature change influence.
Article 1.0.9 Materials like concrete and reinforcement adopted for the concrete plate of composite beam shall meet the requirements of Section II in Chapter V of "Bridge Code". The allowable stress and improvement coefficient of concrete plate shall meet the requirements in Article 5.3.4 of "Bridge Code", while those of reinforcement shall meet the requirements in Article 5.3.5 of "Bridge Code".
Article 1.0.10 Unless otherwise specified in this regulation, the calculation and construction of steel beam and support parts of composite beam shall be implemented according to the related articles in Chapter IV of "Bridge Code".
Article 1.0.11 Unless otherwise specified in this regulation, the calculation and construction of reinforced concrete plate part of composite beam shall be implemented according to the related articles in Chapter V of "Bridge Code".
Article 1.0.12 Coupler shall be arranged on the joint surface of steel beam flange and reinforced concrete plate according to the calculation and construction requirements, the coupler shall be provided with sufficient intensity and durability.
Article 1.0.13 In general, where sufficient couplers are arranged on the joint surface of composite beam, besides the calculation of concrete shrinkage and the influence of temperature change, the steel beam and reinforced concrete plate may be regarded as in joint action entirely, namely, the whole composite beam after load bearing meets the plane section assumption.
Chapter I General
Chapter II Internal Force Calculation
Chapter III Section Design
Chapter IV Coupling of Concrete Plate and Steel Beam
Chapter V Others
Appendix Explanation of Wording in This Regulation
Additional Explanation
