Steel Buildings in Europe

Part 10: Model Construction Specification 10 - 14 According to § 3.4(1) of EN 1991-1-7, the strategies for accidental design situations may be based on the Consequence Classes as set out in EN 1990. Thus, these Consequence Classes shall be specified in the contract documents. According to § 4.3.1(2) of EN 1991-1-7, the contract documents shall specify whether or not the equivalent static design forces due to vehicular impact on members supporting structures over or adjacent to roadways, F dx and F dy , act simultaneously. According to § 4.5.1.2 of EN 1991-1-7, if the building may be subject to impact from derailed railway traffic, the contract documents shall define whether it is a Class A or Class B structure. According to § 4.5.2(1) of EN 1991-1-7, frontal and lateral dynamic design forces due to impact from river and canal traffic, as well as the height of application of the impact force and the impact area shall be specified in the contract documents. 4.7 Actions induced by cranes EN 1991-3 gives design guidance and specifies imposed loads (models and representative values) induced by hoists and cranes on runway beams, which include dynamic effects and braking, acceleration and accidental forces. National choice is allowed through clauses listed in the Foreword to EN 1991-3. Additional contract document requirements Unless more accurate data (concerning the crane characteristics) is specified in the contract documents (the crane supplier shall therefore be known at the time of writing the contract documents), provisions of Section 2 of EN 1991-3 apply. According to § 2.3(6) of EN 1991-3, the contract documents shall specify whether or not tests are performed with cranes on the supporting structures for the serviceability limit state verification. According to § 2.5.2.2(2) of EN 1991-3, the contract documents shall specify whether one or several forces of the five horizontal types (a) to (e) listed in 2.5.2.2(1) shall be included in the same group of simultaneous crane load components. According to § 2.5.2.2(4) of EN 1991-3, the contract documents shall specify the way the longitudinal horizontal forces H L,i and the transverse horizontal wheel forces H T,i , caused by acceleration and deceleration of masses of the crane or the crab, shall be applied. Otherwise, provisions given in Figure 2.3 of EN 1991-3 shall apply. According to § 2.5.3(2) of EN 1991-3, the contract documents shall define the maximum number of cranes to be taken into account as acting simultaneously.